Tag Archive for: circular connector

Connector Shielding Design for EMI Protection

As industrial equipment becomes faster, more compact, and more electronically integrated, electromagnetic interference (EMI) is becoming a more important design challenge. High-speed communication, servo drives, switching power supplies, motors, inverters, sensors, and control systems may all operate within the same equipment.

A connector is often treated as a simple interface between a cable and a device. However, in an EMC-sensitive system, the connector is also part of the shielding path.

A cable may have an effective shield, but if that shield is poorly terminated at the connector, EMI can still enter or leave the system through the connection point. This is why connector shielding should be considered as part of the complete cable and enclosure design rather than as an isolated connector feature.

This article explains the key principles of connector shielding design, including shield termination, 360° shielding, grounding, backshell selection, mechanical integration, and validation.

Why Connector Shielding Matters for EMI Protection

EMI can affect electronic systems through conducted coupling, capacitive or inductive coupling, and radiated electromagnetic fields. Shielded cables are commonly used to reduce the exposure of signal conductors to external interference and to limit unwanted radiation from the cable.

However, the cable shield is only one part of the overall protection system.

A typical shielded connection may include:

Shielded cable
Connector shell
Shield termination
Backshell
Equipment enclosure
Ground or chassis connection

If one section has significantly higher impedance or poor mechanical contact, the effectiveness of the entire shielding system can be reduced.

TE Connectivity notes that shield termination at the backshell can provide a grounding path and that the complete circumference of a cable shield can be connected to the backshell to create a more continuous shielding structure.

This leads to an important design principle:

EMI protection depends on the continuity of the entire shielding path, not simply on whether a cable is labeled “shielded.”

Connector Shielding Starts With the Complete EMC Architecture

Connector selection should not happen independently from the cable, PCB, enclosure, and grounding strategy.

Before selecting a shielded connector, engineers should understand:

operating frequency range
signal type and data rate
cable construction
shielding method
enclosure material
grounding architecture
environmental conditions
vibration and mechanical requirements

A connector that performs well in one application may not provide the same EMC performance in another system.

For example, a high-speed industrial Ethernet application may have very different shielding requirements from a low-frequency sensor cable or a motor power connection.

Therefore, connector shielding should be designed as a complete signal path.

360° Shield Termination vs Partial Shield Termination

One of the most important considerations in connector shielding is how the cable shield is terminated.

A partial shield connection may create gaps or discontinuities around the connector interface. At higher frequencies, these discontinuities can become increasingly important because the shielding system must control electromagnetic fields rather than simply provide a low-frequency electrical connection.

A 360° termination connects the cable shield around its circumference to the connector shell or backshell.

This approach can provide a more continuous shielding path between the cable and connector.

TE Connectivity provides several connector and backshell solutions using 360° screen termination for EMI/RFI applications.

Why 360° Termination Is Important

A properly designed 360° termination can help:

reduce shielding discontinuities
maintain shield continuity through the connector
reduce unwanted radiation
improve immunity against external interference
support more consistent EMC performance

The exact termination method still needs to be selected according to cable construction, frequency range, environmental requirements, and mechanical constraints.

360° termination should therefore be considered a design strategy rather than a universal solution for every application.

The Connector Shell Is Part of the Shielding Path

For a shielded connector system, the metallic shell should not be treated simply as a mechanical housing.

It can form part of the electromagnetic shielding path between:

Cable Shield → Connector Shell → Equipment Interface → Chassis / Enclosure

Any discontinuity within this path can reduce the effectiveness of the overall shielding structure.

Important design considerations include:

conductive shell material
shell-to-shell contact
plating compatibility
contact pressure
surface contamination
connector mating stability
connection to the equipment chassis

For industrial applications exposed to vibration, the shielding interface must also remain electrically stable over the intended service life.

A connector may initially show good electrical continuity but lose performance if mechanical movement causes the shielding contact to degrade.

Backshell Design Has Multiple Functions

The backshell is another important component in connector shielding design.

Depending on the application, a backshell may provide:

EMI/RFI shield termination
cable strain relief
mechanical cable support
environmental sealing
cable routing control
connection between cable shield and connector shell

TE Connectivity describes backshells as components that can combine strain relief, EMI shielding, and environmental protection.

This makes backshell selection especially important for industrial equipment, robotics, servo systems, and other applications where cables experience vibration or repeated movement.

Select the Backshell Based on the Cable

A common design mistake is selecting a connector first and treating the backshell as an accessory afterward.

The backshell should be evaluated together with:

cable diameter
braid construction
foil or braid shield
number of shield layers
bend radius
required strain relief
sealing requirements
installation process

For example, a braided cable may require a different shield termination mechanism from a foil-shielded cable.

Shield Termination Must Balance EMI and Mechanical Reliability

A shielding connection is not useful if it cannot survive the mechanical environment.

Industrial harnesses may experience:

continuous vibration
repeated bending
torsion
temperature cycling
connector mating and unmating
cable pulling forces

The shield termination must therefore maintain electrical continuity while also providing sufficient mechanical retention.

A good design should prevent the cable shield from carrying mechanical loads that should instead be handled by the strain-relief system.

This distinction is important:

Shield termination provides electrical continuity; strain relief manages mechanical forces.

Combining these functions without proper design can create long-term reliability problems.

Grounding Strategy Is Critical

A shielded connector cannot provide effective EMI protection without a suitable grounding or chassis strategy.

The design team should determine where the shield should connect and how the shielding structure interacts with the system enclosure.

Possible considerations include:

chassis grounding
equipment enclosure bonding
connector shell grounding
cable shield termination
PCB ground connection
single-point or multi-point grounding strategy depending on frequency and system architecture

There is no universal grounding configuration for every application. The correct approach depends on the system topology, operating frequency, EMC requirements, and intended current paths.

For high-frequency systems, maintaining a low-impedance shielding path is often more important than simply achieving a low DC resistance measurement.

Avoid Pigtail Shield Termination When High-Frequency Performance Matters

A pigtail termination connects the cable shield to the connector or ground using a short wire.

Although simple and easy to manufacture, a long pigtail can introduce additional inductance into the shielding path. As frequency increases, that inductive impedance can become more significant.

This is why applications with demanding EMC or high-speed signal requirements often use shorter, wider, or circumferential shield termination methods instead of long pigtails.

The design decision should consider the actual frequency range and system requirements rather than applying one termination method universally.

Connector Shielding for High-Speed Industrial Communication

High-speed communication systems are particularly sensitive to shielding discontinuities.

Applications such as:

Industrial Ethernet
machine vision
industrial cameras
robotics
servo drives
motion control
high-speed sensors

can require carefully controlled shielding and grounding.

For example, TE Connectivity’s M12 X-Code connector solutions use a full metal shell and 360° cable shield termination to support high-speed data transmission and EMI protection.

This illustrates an important point: shielding design must support the complete transmission channel rather than focusing only on the connector contact itself.

Mechanical Design and EMC Performance Must Work Together

Connector shielding cannot be separated from mechanical design.

An industrial connector may need to withstand:

vibration
shock
repeated mating cycles
cable movement
temperature changes
moisture and dust

At the same time, it must maintain a stable shielding connection.

A loose shell, insufficient cable retention, or poorly controlled backshell assembly can gradually affect the shielding path.

For this reason, connector design should evaluate electrical and mechanical performance together.

Environmental Protection Can Affect Shielding Performance

Industrial connectors may operate in environments containing:

moisture
dust
oil
chemicals
condensation
salt contamination

These factors can affect conductive surfaces and mechanical interfaces.

Environmental sealing is therefore not completely separate from EMC design. A connector may require both:

EMI shielding + mechanical protection + environmental sealing

For example, a backshell may combine shield termination with a heat-shrink boot or other sealing structure. TE Connectivity’s backshell solutions demonstrate how shielding, strain relief, and environmental protection can be integrated into a single termination system.

How to Validate Connector Shielding Performance

Connector shielding should be validated as part of the complete cable assembly rather than only at component level.

Depending on the application, validation may include:

shield continuity testing
low-resistance measurement
EMC testing
radiated emission testing
conducted emission testing
immunity testing
vibration testing
temperature cycling
environmental exposure
connector mating-cycle testing

The validation method should reflect the actual application frequency range and operating environment.

A connector that passes a simple continuity test does not automatically provide adequate high-frequency EMI performance.

Common Connector Shielding Design Mistakes

Several common mistakes can reduce the effectiveness of an otherwise well-designed shielded cable assembly.

Using a shielded cable with an unshielded connector

The cable may have excellent shielding performance, but the connector interface creates an exposed section.

Terminating only part of the shield

Partial termination can create discontinuities that reduce overall shielding effectiveness.

Using excessive pigtail length

A long pigtail can add inductive impedance, particularly at higher frequencies.

Ignoring connector-to-chassis bonding

The connector shell needs an appropriate electrical relationship with the equipment enclosure.

Treating the backshell as only mechanical protection

A backshell may be a critical part of the EMI shielding and strain-relief system.

Ignoring manufacturing variation

A shielding concept that works in a prototype may perform differently if shield preparation, termination length, crimp force, or assembly position varies during mass production.

How FPIC Supports Shielded Connector and Cable Assembly Projects

For custom connector and cable assembly projects, shielding performance depends on the interaction between the connector, cable, shield termination, backshell, and assembly process.

FPIC supports custom connector and cable assembly development for industrial and other demanding applications, where connector selection, cable construction, shielding, sealing, and manufacturing consistency need to be considered together.

For applications such as industrial automation, robotics, industrial cameras, and control systems, early review of the complete cable-to-connector interface can help reduce EMC and reliability risks before mass production.

The objective is not simply to select a “shielded connector,” but to develop a complete interconnect system with a controlled electrical and mechanical shielding path.

Final Thoughts

Effective connector shielding design is about maintaining a continuous and controlled electromagnetic barrier from the cable through the connector and into the equipment enclosure.

The most important design considerations include:

appropriate connector shell construction
reliable shield termination
360° shielding where required
suitable backshell design
controlled grounding and bonding
mechanical strain relief
environmental protection
validation under realistic operating conditions

For high-speed industrial equipment and EMC-sensitive systems, the connector should be treated as an active part of the shielding architecture.

A well-designed connector interface can help protect signal integrity, reduce EMI-related failures, and improve the long-term reliability of the complete cable assembly.

FAQ

What is connector shielding?

Connector shielding is the use of conductive connector shells, backshells, shield termination methods, and grounding structures to reduce electromagnetic interference entering or leaving an electrical connection.

Why is 360° shield termination important?

A 360° termination provides a continuous circumferential connection between the cable shield and connector shielding structure. It can help reduce shielding discontinuities and support more consistent EMI performance, particularly in demanding applications.

Is a metal connector enough for EMI protection?

No. A metal connector shell alone does not guarantee effective EMI protection. Cable shield termination, shell bonding, backshell design, grounding, cable construction, and assembly quality all influence the final shielding performance.

What is the difference between shield termination and strain relief?

Shield termination establishes electrical continuity between the cable shield and connector shielding structure. Strain relief manages mechanical forces on the cable. These functions should work together but should not be treated as the same function.

Are shielded connectors necessary for industrial Ethernet?

They may be necessary depending on the system architecture, data rate, EMC environment, cable construction, and applicable requirements. High-speed industrial communication systems often require carefully controlled shielding and grounding to maintain signal integrity.

How can connector shielding performance be tested?

Depending on the application, validation can include shield continuity, low-resistance measurement, EMC testing, radiated and conducted emissions, immunity testing, vibration, thermal cycling, and environmental testing.

Need a Custom Shielded Connector or Cable Assembly?

If your application requires reliable EMI protection for industrial automation, robotics, industrial cameras, motion control, or other demanding systems, connector and cable shielding should be considered together from the beginning.

FPIC supports custom connector and cable assembly projects with engineering review, connector integration, cable assembly, and production support.

Contact FPIC to discuss your connector shielding requirements.

Resources

TE Connectivity – INTERCONTEC Connectors: provides examples of industrial connectors using 360° EMC shield termination for motor and industrial applications.
TE Connectivity – Tinel-Lock Backshells for Military Applications: explains shield termination, backshell design, electrical continuity, strain relief, and 360° braid termination for demanding environments.
TE Connectivity – M12 X-Code Connector Series: provides an industrial M12 example using a full metal shell and 360° cable shield termination for high-speed data applications.
TE Connectivity – Space-Grade Backshells for Micro-D and D-Sub Connectors: discusses the relationship between EMI shielding, grounding, backshells, strain relief, and environmental protection.
TE Connectivity – Screened Backshells and Adapters: provides examples of braided, banded, and 360° shield termination solutions for screened cable assemblies.

September 11, 2026/by FPIC

Engineering & Testing, News

Connector Material Selection Guide for Engineers

A connector may look simple from the outside, but its reliability depends heavily on the materials used throughout the assembly.

A typical connector includes several material systems:

Housing + Contacts + Plating + Seals + Locks + Secondary Components

Each material has a different function.

The housing must provide insulation and mechanical protection. The contact system must maintain stable electrical performance. Plating must protect the contact interface from corrosion and wear. Seals must maintain environmental protection without compromising assembly performance.

Selecting materials based only on cost or a single specification can create reliability problems later in the product lifecycle.

For demanding applications such as automotive electronics, industrial automation, robotics, medical equipment, and energy systems, material selection should therefore be treated as a system-level engineering decision.

The objective is to balance:

Electrical Performance + Mechanical Strength + Thermal Stability + Environmental Resistance + Manufacturability + Cost

Why Connector Material Selection Matters

Connector materials directly influence how a connector performs throughout its service life.

Poor material selection can contribute to:

Contact resistance increase
Corrosion
Terminal deformation
Housing cracking
Seal degradation
Insulation failure
Poor mating performance
Reduced vibration resistance
Premature connector failure

For example, a housing material may meet the required temperature rating but lack sufficient mechanical strength.

Likewise, a contact alloy may provide excellent conductivity but require a different plating system to achieve the required corrosion and wear resistance.

This is why engineers should evaluate the complete material combination, rather than selecting each material independently.

1.Connector Housing Material Selection

The connector housing provides:

Electrical insulation
Mechanical support
Terminal positioning
Mating alignment
Environmental protection
Structural protection

The housing material therefore needs to withstand the expected electrical, thermal, mechanical, and environmental conditions.

Common connector housing materials include:

PA / Nylon
PBT
PPS
LCP
PEEK
PC and other engineering polymers

The best material depends on the application rather than simply its nominal strength.

2.PA / Nylon

Polyamide materials are widely used in connector housings because they can provide a useful combination of:

Mechanical strength
Impact resistance
Processability
Cost efficiency

However, different grades can behave differently in terms of:

Water absorption
Dimensional stability
Temperature resistance
Chemical resistance

For applications involving humidity or significant temperature variation, engineers should evaluate the specific PA grade rather than treating all nylon materials as equivalent.

3.PBT

Polybutylene terephthalate, or PBT, is commonly used for electrical and automotive connector housings.

Potential advantages include:

Good dimensional stability
Electrical insulation
Chemical resistance
Suitable molding characteristics
Good temperature performance for many applications

PBT can be attractive where dimensional precision and electrical insulation are important.

4.PPS for Higher-Temperature Applications

Polyphenylene sulfide (PPS) is an engineering polymer commonly considered for demanding thermal and chemical environments.

Potential characteristics include:

High temperature resistance
Low moisture absorption
Good dimensional stability
Chemical resistance
Electrical insulation

PPS can be useful when the connector must maintain dimensional stability under elevated temperatures.

However, material selection should always consider the actual temperature profile, not simply the maximum advertised material temperature.

5.LCP for Fine-Pitch Connectors

Liquid crystal polymer (LCP) is often considered for compact and fine-pitch connector designs.

Its characteristics can support applications requiring:

Thin-wall molding
Dimensional precision
Fine-pitch structures
Good thermal performance
Low moisture absorption

As connector dimensions decrease, housing dimensional stability becomes increasingly important.

A material suitable for a large connector may not necessarily be the best choice for a miniature high-density connector.

6.PEEK for Highly Demanding Applications

PEEK is a high-performance engineering polymer used in applications requiring demanding combinations of:

Temperature resistance
Chemical resistance
Mechanical strength
Dimensional stability

Its higher material cost means it is generally considered when standard engineering plastics cannot adequately meet the application requirements.

Material selection should therefore consider total system requirements, rather than simply selecting the highest-performance material available.

7.Flame Retardancy

For many electronic and industrial applications, connector housing materials may need to meet specific flammability requirements.

Engineers should consider:

Applicable safety requirements
Electrical application
Equipment enclosure
Operating voltage
Installation environment

A flame-retardant grade can affect other material characteristics such as:

Mechanical strength
Flow behavior
Moldability
Cost

Therefore, flame retardancy should be evaluated together with the overall material specification.

8.Connector Contact Material Selection

The contact system is responsible for maintaining the electrical interface.

Common contact alloys include:

Copper
Brass
Phosphor bronze
Copper alloys
Beryllium copper for specialized applications

The selected material affects:

Electrical conductivity
Spring properties
Contact force
Fatigue resistance
Thermal behavior
Corrosion resistance
Manufacturability

A connector contact must provide both electrical performance and mechanical reliability.

9.Brass Contacts

Brass is widely used for connector terminals because it provides a practical balance of:

Conductivity
Strength
Formability
Cost

It can be suitable for many general-purpose connector applications.

However, for high-flex or high-contact-force applications, another copper alloy may provide more suitable mechanical properties.

10.Phosphor Bronze Contacts

Phosphor bronze can provide good spring characteristics and fatigue resistance.

It is often considered when the contact must maintain stable mechanical behavior during repeated mating or long-term operation.

Potential applications include:

Signal connectors
Control connectors
Industrial equipment
Repeated mating interfaces

The final choice depends on the required contact force, conductivity, mating cycles, and environmental conditions.

11.Beryllium Copper

Beryllium copper can provide excellent spring properties and good electrical conductivity.

It may be considered for applications requiring:

High contact force
Miniaturized contacts
Repeated mating
Strong elastic recovery

Because material cost and processing considerations can be higher, engineers should use it when its performance advantages justify the additional complexity.

12.Contact Plating Selection

Contact plating forms the actual surface interface between mating contacts.

Common plating materials include:

Tin

Tin is widely used for cost-sensitive applications and can provide practical performance for many power connections.

Gold

Gold plating provides excellent corrosion resistance and stable contact behavior.

It is particularly useful where:

Low-level signals are involved
Long-term contact stability is important
Corrosive environments are present
High mating-cycle performance is required

Silver

Silver has excellent electrical conductivity and can be considered for certain power and high-current applications.

However, its behavior under specific environmental conditions must be carefully evaluated.

13.Gold Plating Thickness Matters

Simply specifying “gold plated” is not enough.

Engineers should also consider:

Gold thickness
Plating area
Underplating
Contact force
Mating cycles
Operating environment

A thin decorative gold layer and an engineered contact plating system do not necessarily provide the same long-term performance.

For demanding applications, plating specifications should be clearly defined in the connector drawing or technical specification.

14.Underplating Matters Too

The plating system can include multiple layers.

For example:

Base Contact Alloy → Underplating → Gold Surface

The underplating can help provide:

Corrosion protection
Diffusion resistance
Better plating stability

The complete plating structure should therefore be evaluated rather than looking only at the visible surface material.

15.Connector Seal Material Selection

Seals become critical when connectors must resist:

Water
Dust
Oil
Chemicals
Temperature cycling

Common sealing materials include:

Silicone rubber
EPDM
Fluoroelastomer materials
Other application-specific elastomers

The correct seal depends heavily on the environment.

16.Silicone Seals

Silicone can provide good flexibility across a broad temperature range.

It is commonly considered where connectors must tolerate:

Temperature variation
Repeated assembly
Flexible sealing interfaces

However, chemical compatibility must still be evaluated for the actual application.

17.EPDM Seals

EPDM can provide good resistance to:

Water
Weathering
Ozone
Certain environmental conditions

It may be suitable for outdoor or automotive environments depending on the specific fluid and temperature exposure.

18.Chemical Compatibility Is Critical

A connector material may perform well in a laboratory but degrade when exposed to the actual application environment.

Potential contaminants include:

Automotive fluids
Lubricants
Cleaning agents
Coolants
Hydraulic fluids
Industrial chemicals

Material compatibility should therefore be validated against the actual chemicals and concentrations expected during the connector’s service life.

19.Temperature Selection Should Consider the Complete System

Connector temperature performance is not determined by housing material alone.

The complete system includes:

Current → Contact Resistance → Heat Generation → Housing → Surrounding Environment

Higher current can increase temperature at the contact interface.

This means the connector must be evaluated under realistic electrical loading.

Engineers should consider:

Ambient temperature
Current load
Number of loaded circuits
Contact resistance
Heat dissipation
Housing material
Installation conditions

20.Material Selection for High-Current Connectors

High-current connectors place greater demands on the contact system.

Important factors include:

Contact resistance
Conductivity
Contact force
Terminal cross-section
Plating
Temperature rise
Thermal dissipation

Simply choosing a highly conductive alloy does not automatically create a reliable high-current connector.

The complete contact geometry and mechanical interface also matter.

21.Material Selection for Fine-Pitch Connectors

Miniaturized connectors create different material challenges.

As pitch decreases:

Housing walls become thinner
Terminal spacing decreases
Dimensional tolerances become tighter
Mating alignment becomes more sensitive

Materials with good dimensional stability and molding precision may therefore become increasingly important.

This is one reason material selection should be performed together with connector geometry and manufacturing process development.

22.Material Selection for Automotive Connectors

Automotive connectors may encounter:

Temperature cycling
Vibration
Humidity
Dust
Oil
Chemical exposure
Long service life requirements

Material selection should therefore consider the complete automotive environment.

For automotive connector products, FPIC applies IATF 16949 quality management requirements and supports production processes designed for demanding automotive applications.

23.Material Selection for Industrial Connectors

Industrial connectors may be exposed to:

Continuous vibration
Machinery movement
Oil
Dust
Chemicals
Outdoor environments

Industrial connector material selection should consider not only IP protection but also mechanical durability and chemical compatibility.

For example, an industrial connector used near motors may require different mechanical characteristics from one installed inside a protected control cabinet.

24.Material Selection for Medical Connectors

Medical applications may place additional requirements on:

Biocompatibility
Cleaning resistance
Chemical exposure
Sterilization
Reliability
Traceability

The material selection process should therefore begin with the applicable medical device requirements and cleaning or sterilization process.

25.Manufacturing Must Be Considered

A material with excellent laboratory performance may still be difficult to manufacture.

Engineers should evaluate:

Injection molding behavior
Shrinkage
Warpage
Flow characteristics
Terminal stamping
Plating process
Crimp compatibility
Assembly tolerances

Material selection should support not only prototype performance but also stable mass production.

Connector Material Selection Matrix

Component	Common Materials	Main Selection Factors
Housing	PA, PBT, PPS, LCP, PEEK	Temperature, insulation, strength, chemicals
Contact	Brass, phosphor bronze, copper alloys	Conductivity, spring force, fatigue
Plating	Tin, gold, silver	Corrosion, current, mating cycles
Seal	Silicone, EPDM, fluoroelastomer	Temperature, water, chemicals
Locking Parts	Engineering plastics / metals	Retention, vibration, durability
Shielding	Copper alloys / metal shells	EMC, grounding, mechanical strength

Common Connector Material Selection Mistakes

Mistake	Potential Consequence
Selecting housing only by temperature rating	Mechanical or dimensional problems
Treating all nylon grades as identical	Unexpected moisture or thermal behavior
Selecting contact material only by conductivity	Insufficient spring performance
Specifying gold plating without thickness	Unclear contact durability
Ignoring underplating	Corrosion or diffusion concerns
Selecting seals without chemical testing	Swelling or degradation
Ignoring current-related heat generation	Excessive temperature rise
Choosing materials without DFM review	Molding or assembly problems
Selecting the highest-performance material automatically	Unnecessary cost
Evaluating materials independently	System-level compatibility problems

A Practical Connector Material Selection Workflow

Step 1: Define the Environment

Identify:

Temperature
Humidity
Water
Dust
Chemicals
Vibration
UV exposure

Step 2: Define Electrical Requirements

Identify:

Current
Voltage
Signal type
Contact resistance
Mating cycles

Step 3: Define Mechanical Requirements

Consider:

Contact force
Mating force
Retention
Shock
Vibration
Connector size

Step 4: Select Housing Material

Match:

Temperature + Insulation + Mechanical + Environmental Requirements

Step 5: Select Contact Alloy

Match:

Conductivity + Spring Properties + Fatigue + Formability

Step 6: Select Plating

Match:

Corrosion + Wear + Current + Signal + Mating Cycles

Step 7: Select Seal Material

Match:

Temperature + Fluids + Water + Chemical Exposure

Step 8: Validate the Complete Connector

Evaluate:

Electrical performance
Mechanical performance
Temperature rise
Environmental resistance
Mating cycles
Dimensional stability
Production consistency

Material Selection Should Follow Application Requirements

A common mistake is starting with a preferred material and trying to make it fit the application.

A better approach is:

Application → Requirements → Material Properties → Component Design → Validation

For example, if a connector operates in a high-temperature environment, engineers should not simply select the highest-temperature housing material.

They should first ask:

What is the actual temperature profile?
How much current flows through the contacts?
How long is the exposure?
Is vibration present?
Are chemicals present?
How many mating cycles are required?

The answers determine the appropriate material combination.

Why Material Compatibility Matters

A connector is a multi-material system.

Consider:

Housing + Contact Alloy + Plating + Seal + Cable + Mating Connector

Changing one material can influence another.

For example:

Housing shrinkage can affect terminal position.
Contact force can affect plating wear.
Seal hardness can affect mating force.
Temperature can affect housing dimensions.
Chemical exposure can affect both housing and seals.

This is why reliable connector development requires cross-functional material engineering.

How FPIC Supports Connector Material Selection

FPIC provides customized connector development and manufacturing solutions covering:

Connector housing materials
Contact materials
Contact plating
Sealing systems
Terminal stamping
Connector assembly
Electrical testing
Dimensional inspection
Reliability validation

FPIC’s automotive connector products are manufactured under IATF 16949 quality management requirements.

For automotive connector production, FPIC also supports mass-production cleanliness requirements aligned with VDA 19.1 / ISO 16232 practices.

Material and component selection can be evaluated together with connector geometry, tooling, assembly, and testing requirements.

This system-level approach helps OEM customers develop connectors that balance performance, reliability, manufacturability, and cost.

Final Thoughts

Connector material selection is not simply a question of choosing the strongest plastic, most conductive metal, or thickest plating.

The correct material combination depends on the complete application.

Engineers should evaluate:

Housing + Contact + Plating + Seal + Environment + Electrical Load + Mechanical Requirements

The best connector material is the one that provides the required performance throughout the expected service life while remaining manufacturable and commercially practical.

A structured selection process can help reduce:

Corrosion risk
Thermal problems
Mechanical failure
Seal degradation
Manufacturing variation
Lifecycle cost

Ultimately, successful connector design begins with understanding the application and selecting materials that work together as a complete system.

FAQ

What is the most important factor in connector material selection?

There is no single factor. Temperature, current, environment, mechanical loading, mating cycles, dimensional requirements, and manufacturing conditions should all be considered together.

Which material is commonly used for connector housings?

PA and PBT are widely used for many connector applications, while PPS, LCP, PEEK, and other engineering polymers may be considered for more demanding thermal, dimensional, or chemical requirements.

What materials are commonly used for connector contacts?

Brass, phosphor bronze, and other copper alloys are commonly used. The selection depends on conductivity, spring properties, contact force, fatigue resistance, and application requirements.

Is gold plating always better than tin plating?

Not necessarily. Gold can provide excellent corrosion resistance and stable contact performance, but it can increase cost. Tin may be suitable for many power applications. The correct plating depends on current, signal type, environment, and mating requirements.

How should connector seal material be selected?

Seal material should be evaluated against the actual temperature range, water exposure, chemicals, oils, cleaning agents, and expected service life.

Does connector housing material affect electrical reliability?

Yes. Housing material affects insulation, terminal positioning, dimensional stability, heat resistance, and mechanical protection, all of which can influence connector reliability.

Why should material selection consider manufacturing?

A material may perform well technically but create molding, stamping, plating, assembly, or cost problems at production volume. DFM should therefore be included early in the material selection process.

Need Help Selecting Materials for Your Connector?

FPIC supports OEM and engineering teams with connector design and manufacturing from material selection and tooling through assembly, testing, and mass production.

Whether you need a compact fine-pitch connector, high-current connector, automotive connector, industrial connector, or customized interconnection solution, our engineering team can evaluate the complete material and application requirements.

Contact FPIC to discuss your connector development project.

Resources

IEC
https://www.iec.ch/
International standards and technical resources covering electrical and electronic technologies.
SAE International
https://www.sae.org/
Automotive engineering standards and technical resources.
IPC
https://www.ipc.org/
Industry standards and resources for electronic interconnection and manufacturing.
IATF Global Oversight
https://www.iatfglobaloversight.org/
Resources related to IATF 16949 automotive quality management requirements.

September 4, 2026/by FPIC

Engineering & Testing, News

Connector Design Guide: From Contact System to Final Assembly

A connector may look like a simple component, but its performance depends on the interaction of multiple engineering elements.

A reliable connector requires careful design of:

Contact system
Housing structure
Locking mechanism
Sealing system
Material selection
Manufacturing process
Final assembly and testing

A mistake in any stage can affect:

Electrical performance
Mechanical reliability
Environmental protection
Service life

For engineers developing industrial, automotive, robotics, energy storage, and automation systems, connector design should be considered as a complete engineering process—not just a component selection task.

This guide explains the key stages of connector design, from the internal contact system to final production validation.

Why Connector Design Requires System-Level Thinking

A connector performs three primary functions:

Electrical Connection

Providing stable current or signal transmission.

Important factors:

Contact resistance

Current capacity

Signal integrity

Plating performance

Mechanical Connection

Maintaining a secure connection under real-world conditions.

Important factors:

Mating force

Locking structure

Vibration resistance

Mating cycles

Environmental Protection

Protecting internal components from harsh environments.

Important factors:

Waterproof sealing

Dust protection

Temperature resistance

Chemical exposure

A successful connector design balances all three requirements.

1.Contact System Design: The Core of Connector Performance

The contact system is the electrical heart of a connector.

Its design directly affects:

Conductivity
Heat generation
Reliability
Service life

Contact Geometry Design

Contact geometry determines how terminals connect and maintain contact force.

Key considerations include:

✔ Contact area

✔ Spring structure

✔ Contact pressure

✔ Current path design

A properly designed contact system provides:

Stable electrical connection

Low resistance

Long-term performance

Contact Material Selection

Common contact materials include:

Copper Alloys

Advantages:

✔ Good conductivity

✔ Balanced strength

✔ Cost efficiency

Phosphor Bronze

Advantages:

✔ Good spring performance

✔ Excellent fatigue resistance

Beryllium Copper

Advantages:

✔ High elasticity

✔ Excellent contact force retention

Used for:

High-cycle connectors
Precision applications

Contact Plating Selection

Surface plating affects:

Corrosion resistance
Contact stability
Mating life

Common options include:

Gold Plating

Advantages:

✔ Excellent corrosion resistance

✔ Reliable low contact resistance

Suitable for:

Signal connectors
Medical equipment
High-cycle applications

Tin Plating

Advantages:

✔ Cost-effective

✔ Suitable for many power applications

The correct plating depends on:

Current level
Environment
Required mating cycles

2.Housing Design: Mechanical Protection and Alignment

The connector housing protects internal contacts and ensures proper mating.

A good housing design must provide:

✔ Mechanical strength

✔ Accurate terminal positioning

✔ Electrical insulation

✔ Assembly efficiency

Housing Material Selection

Common materials include:

PA (Polyamide)

Used for:

Industrial connectors
General applications

Benefits:

Good strength
Cost efficiency

PBT

Benefits:

Dimensional stability
Low moisture absorption

PPS

Benefits:

High temperature resistance
Chemical resistance

Material selection depends on:

Operating temperature
Mechanical requirements
Environmental conditions

Terminal Positioning and Polarization

Connector housings should prevent incorrect assembly.

Important design features:

Keying structures
Polarization features
Secondary locks

These features help prevent:

❌ Wrong mating

❌ Terminal back-out

❌ Assembly mistakes

3.Locking Mechanism Design

A reliable locking system prevents accidental disconnection.

Common locking methods include:

Threaded Locking

Advantages:

✔ High vibration resistance

✔ Strong mechanical retention

Applications:

Industrial equipment
Outdoor systems

Push-Pull Locking

Advantages:

✔ Fast connection

✔ Easy operation

✔ High mating efficiency

Applications:

Medical
Automation
Test equipment

Snap Locking

Advantages:

✔ Simple operation

✔ Cost-effective

Applications:

General electronic applications

4.Sealing and Environmental Protection

For harsh environments, sealing design is critical.

Connector sealing protects against:

Water
Dust
Oil
Humidity

Common sealing components include:

O-rings
Gaskets
Rubber seals

IP Protection Considerations

Depending on the application, connectors may require:

IP67
IP68
IP69K

Higher protection levels require careful control of:

Seal compression
Housing interface
Material compatibility

5.Connector Assembly Design

Connector assembly affects both quality and manufacturing efficiency.

A production-ready design should consider:

Terminal Insertion

Important factors:

✔ Insertion force

✔ Terminal retention

✔ Position accuracy

Secondary Locking System

Secondary locks improve:

Terminal retention
Assembly reliability
Safety

Assembly Error Prevention

Good designs include:

Visual identification
Mechanical keying
Assembly guidance

These features improve production consistency.

6.Connector Validation and Testing

Before mass production, connectors require validation.

Common tests include:

Electrical Testing

Including:

Contact resistance
Insulation resistance
Hi-Pot testing

Mechanical Testing

Including:

Insertion force
Extraction force
Mating cycles
Vibration testing

Environmental Testing

Including:

Temperature cycling
Humidity testing
Salt spray testing
Water ingress testing

Testing ensures the connector performs under real application conditions.

7.Connector Design for Mass Production

A successful connector design must also consider manufacturing.

Key DFM considerations include:

Injection Molding

Evaluate:

Wall thickness
Draft angle
Mold complexity

Terminal Stamping

Evaluate:

Material utilization
Contact geometry
Production consistency

Assembly Automation

Evaluate:

Assembly direction
Process repeatability
Inspection requirements

Good connector design reduces production risks.

How FPIC Approaches Connector Design

FPIC provides customized connector solutions from engineering design through mass production.

Our connector development process considers:

Contact system design
Housing structure
Material selection
Manufacturing feasibility
Assembly optimization
Reliability testing

By combining engineering experience with manufacturing capability, FPIC helps customers develop connectors that meet demanding industrial requirements.

Final Thoughts

Connector design is a system engineering process.

A reliable connector requires the right balance between:

Contact performance
Mechanical structure
Environmental protection
Manufacturing efficiency

From the first contact design to final assembly validation, every detail influences long-term reliability.

For OEM engineers, selecting the right connector partner means choosing a team that understands both product performance and manufacturing reality.

A high-quality connector is not simply assembled—it is engineered.

FAQ

What are the main parts of a connector?

The main parts include contacts, housing, locking mechanism, sealing components, and assembly features.

Why is contact design important in connectors?

The contact system determines electrical performance, contact resistance, current capability, and mating reliability.

What factors affect connector lifetime?

Key factors include materials, contact force, mating cycles, environment, vibration, and manufacturing quality.

What tests are required for connector validation?

Common tests include electrical testing, mechanical testing, environmental testing, and durability testing.

Why should connector design consider manufacturing early?

Early manufacturing consideration improves production efficiency, reduces defects, and controls cost.

Need a Custom Connector Solution?

FPIC develops customized connector solutions for industrial automation, robotics, energy storage, automotive, and other demanding applications.

From contact design and material selection to tooling, assembly, and testing, FPIC supports customers from concept development to mass production.

Contact FPIC today to discuss your connector project.

Resources

IEC 60512 – Connectors for Electronic Equipment – Tests and Measurements
https://www.iec.ch/
Connector testing methods covering electrical, mechanical, and environmental performance.
IPC/WHMA-A-620 – Requirements and Acceptance for Cable and Wire Harness Assemblies
https://www.ipc.org/
Industry requirements for cable assembly quality and workmanship.
ISO 16750 – Road Vehicles Environmental Conditions and Testing
https://www.iso.org/
Environmental testing guidance for automotive electrical components.
IATF 16949 Automotive Quality Management System
https://www.iatfglobaloversight.org/
Automotive quality management requirements for production consistency.

August 14, 2026/by FPIC

Engineering & Testing, News

Connector DFM Guide: How to Balance Performance, Manufacturability and Cost

Designing a connector is not only about achieving the highest electrical performance.

A connector must also be:

Easy to manufacture
Consistent in mass production
Cost-effective
Reliable throughout its service life

Many connector designs fail to consider manufacturing requirements early enough.

The result can include:

Complex assembly processes
Higher tooling costs
Production delays
Difficult quality control
Increased unit cost

This is why Design for Manufacturing (DFM) plays an important role in connector development.

A successful connector design balances three key factors:

Performance + Manufacturability + Cost

What Is Connector DFM?

Connector DFM (Design for Manufacturing) is an engineering approach that considers production requirements during the design stage.

Instead of designing a connector first and solving manufacturing problems later, DFM integrates:

Material selection
Tooling requirements
Assembly processes
Testing methods
Production scalability

from the beginning.

The goal is to create a connector that performs well while remaining practical for high-volume manufacturing.

Why DFM Matters in Connector Development

A connector may perform well in a laboratory environment but face challenges during mass production.

Common issues caused by poor DFM include:

❌ Difficult assembly

❌ Tight manufacturing tolerances

❌ High tooling complexity

❌ Low production yield

❌ Increased inspection requirements

❌ Higher manufacturing cost

A DFM-focused design reduces these risks by considering the entire product lifecycle.

1.Design for Electrical Performance

The first priority of any connector is reliable electrical performance.

DFM does not mean reducing performance.

Instead, it means achieving required performance with an optimized design.

Key electrical considerations include:

Contact System Design

The contact structure affects:

Current capacity
Contact resistance
Mating cycles
Signal integrity

Engineers should evaluate:

✔ Contact geometry

✔ Contact force

✔ Material selection

✔ Plating thickness

✔ Current path design

A well-designed contact system improves reliability while avoiding unnecessary material costs.

Creepage and Clearance Design

For higher voltage applications, spacing requirements are critical.

Proper DFM considers:

Insulation distance
Housing structure
Manufacturing capability

Over-designing spacing may increase connector size and cost.

Under-designing may create safety risks.

The goal is the correct balance.

2.Design for Manufacturability

A connector designed for manufacturing should support stable and efficient production.

Important factors include:

Simplify Connector Structure

Complex structures increase:

Mold difficulty
Assembly steps
Failure risks

Good DFM practices include:

✔ Reducing unnecessary components

✔ Simplifying assembly direction

✔ Minimizing manual operations

✔ Improving part consistency

Optimize Housing Design

The connector housing must consider injection molding requirements.

Important factors:

Wall thickness
Draft angles
Rib design
Shrinkage control
Mold release

Poor housing design can lead to:

Warpage
Cracks
Dimensional variation

Improve Assembly Efficiency

Mass production requires repeatable assembly.

Design considerations:

✔ Easy terminal insertion

✔ Clear orientation features

✔ Locking mechanism feedback

✔ Error-proof assembly

These features reduce production errors and improve efficiency.

3.Material Selection for DFM

Material selection affects both performance and manufacturing cost.

Important factors include:

Temperature resistance
Mechanical strength
Chemical resistance
Processing requirements

Common connector materials:

Housing Materials

PA (Polyamide)

Advantages:

✔ Good mechanical strength

✔ Cost-effective

✔ Widely available

PBT

Advantages:

✔ Dimensional stability

✔ Good electrical insulation

PPS

Advantages:

✔ High temperature performance

✔ Excellent chemical resistance

The right material depends on the application requirements.

Contact Materials

Common choices:

Copper alloys
Phosphor bronze
Beryllium copper

Selection depends on:

Conductivity
Spring performance
Mating cycles
Cost targets

4.Design for Tooling Efficiency

Connector tooling can represent a significant development investment.

DFM helps reduce tooling complexity.

Key considerations:

Mold Design

Good connector designs consider:

✔ Fewer sliders

✔ Simple parting lines

✔ Stable cavity design

✔ Easy maintenance

Terminal Stamping Design

Terminal design affects:

Material usage
Stamping speed
Production consistency

Optimized terminal geometry can reduce:

Material waste
Processing cost
Defect rates

5.Balancing Performance and Cost

The lowest-cost connector is not always the most economical solution.

A cheaper connector may create:

Higher failure risk
More maintenance
Increased warranty costs

Effective cost optimization focuses on:

Right Specification

Avoid unnecessary features.

Example:

Not every application requires:

Premium plating
Extreme temperature materials
Maximum mating cycles

Production Efficiency

Reduce cost through:

✔ Better tooling design

✔ Automated assembly

✔ Higher yield

✔ Reduced inspection time

Lifecycle Cost

A reliable connector can reduce:

Downtime
Replacement costs
Field failures

The best design optimizes total value, not only unit price.

6.DFM Review Process for Connector Development

A typical connector DFM review includes:

Step 1: Requirement Analysis

Evaluate:

Electrical requirements
Mechanical conditions
Environmental exposure
Cost targets

Step 2: Design Review

Check:

Structure
Materials
Tolerances
Assembly method

Step 3: Manufacturing Evaluation

Review:

Mold feasibility
Stamping process
Automation possibility
Testing requirements

Step 4: Prototype Validation

Perform:

Dimensional inspection
Electrical testing
Mechanical testing
Environmental testing

Step 5: Mass Production Optimization

Monitor:

Yield
Process stability
Quality data
Cost performance

How FPIC Applies DFM Principles to Connector Development

FPIC supports customers from connector concept development to mass production.

Our engineering approach considers:

Application requirements
Connector structure
Material selection
Tooling feasibility
Assembly efficiency
Quality validation

Through DFM-driven development, FPIC helps customers achieve connectors that are:

✔ Reliable

✔ Manufacturable

✔ Cost-efficient

✔ Ready for mass production

Final Thoughts

A successful connector design requires more than excellent technical specifications.

The best connector balances:

Electrical performance
Mechanical reliability
Manufacturing efficiency
Cost control

By applying DFM principles early, engineers can reduce development risks, improve production consistency, and create products that perform reliably in real-world applications.

Good connector design begins before production starts.

FAQ

What does DFM mean in connector design?

DFM means Design for Manufacturing, an approach that optimizes connector design for efficient and reliable production.

Why is DFM important for connectors?

DFM reduces manufacturing problems, improves production yield, lowers cost, and helps ensure consistent quality.

Does DFM reduce connector performance?

No. Proper DFM achieves the required performance while improving manufacturability and cost efficiency.

What factors should be considered during connector DFM?

Engineers should consider materials, tooling, assembly process, tolerances, testing, and production requirements.

When should DFM review happen?

DFM should begin during the early connector design stage before tooling and mass production.

Need a Connector Designed for Mass Production?

FPIC provides customized connector solutions with engineering support from design optimization to volume manufacturing.

With experience in connector development, tooling coordination, assembly, and testing, FPIC helps OEM customers create reliable and production-ready connector solutions.

Contact FPIC today to discuss your connector development project.

Resources

IEC 60512 – Connectors for Electronic Equipment – Tests and Measurements
https://www.iec.ch/
Connector testing methods for electrical and mechanical performance evaluation.
IPC/WHMA-A-620 – Requirements and Acceptance for Cable and Wire Harness Assemblies
https://www.ipc.org/
Industry requirements for cable and harness manufacturing quality.
ISO 9001 Quality Management Systems
https://www.iso.org/iso-9001-quality-management.html
Quality management principles supporting consistent manufacturing processes.
IATF 16949 Automotive Quality Management System
https://www.iatfglobaloversight.org/
Automotive quality requirements focused on process control and defect prevention.

August 14, 2026/by FPIC

Industry Trends, News

Industrial Ethernet Connector Design: Why Mechanical Stability Matters as Much as Speed

Industrial Ethernet has become the communication backbone of modern automation systems. Protocols such as EtherCAT, PROFINET, EtherNet/IP, and Modbus TCP connect PLCs, servo drives, robots, machine vision systems, and distributed I/O with high-speed, real-time data exchange.

As communication speeds continue to increase, engineers often focus on bandwidth, cable category, and protocol compatibility. However, one equally important factor is frequently overlooked—mechanical stability.

Even a connector capable of supporting Gigabit Ethernet can experience intermittent communication if vibration, repeated movement, or unstable contact compromises the physical connection.

This article explores why connector mechanical design is just as important as transmission speed for reliable Industrial Ethernet performance.

High-Speed Communication Depends on Stable Physical Connections

Industrial Ethernet transmits high-frequency differential signals that are far more sensitive than conventional power circuits.

Any variation in contact pressure or electrical continuity can negatively affect communication quality.

Poor mechanical stability may result in:

Packet loss
Increased bit error rate
Network reconnection
Communication interruptions
Unexpected production downtime

For high-speed industrial networks, electrical performance begins with a mechanically reliable connection.

Industrial Environments Are Constantly Moving

Unlike office networks, industrial Ethernet connectors operate under continuous mechanical stress.

Typical sources include:

Robot arm acceleration
Servo motor vibration
Conveyor movement
Machine tool impacts
AGV and AMR motion
Continuous drag chain movement

These conditions can gradually loosen poorly designed connectors or reduce contact stability over time.

Connector reliability must therefore be evaluated under real operating conditions rather than laboratory environments.

Locking Mechanisms Improve Network Reliability

One of the primary functions of an Industrial Ethernet connector is preventing accidental disconnection.

Common locking mechanisms include:

Threaded Locking

Advantages:

Excellent vibration resistance
High mechanical retention
Suitable for permanent installations

Typical applications:

Servo systems
CNC machines
Heavy industrial equipment

Push-Pull Locking

Advantages:

Fast installation
One-handed operation
Secure self-locking
Reduced maintenance time

Typical applications:

Robotics
Medical equipment
Automated production lines

Bayonet Locking

Advantages:

Quick quarter-turn connection
Reliable positioning
Good mechanical security

Typical applications:

Mobile machinery
Outdoor automation
Portable industrial equipment

Selecting the correct locking mechanism helps maintain stable Ethernet communication while simplifying maintenance.

Contact Stability Directly Affects Signal Integrity

Industrial Ethernet connectors must maintain consistent electrical contact despite vibration and repeated movement.

Important design factors include:

Contact spring design
Contact force
Gold-plated contacts
Precision machining
Stable insertion force

High-quality contacts minimize fluctuations in resistance and help preserve signal integrity over long operating periods.

Shielding Is More Than EMI Protection

Industrial environments contain numerous sources of electromagnetic interference, including:

Variable frequency drives
Servo amplifiers
Switching power supplies
High-current power cables

Shielded connectors provide:

Reduced electromagnetic interference
Better signal integrity
Stable high-speed communication
Lower communication error rates

For maximum EMC performance, connector shielding should include continuous 360° shield termination between the cable braid and the connector housing.

Environmental Protection Supports Long-Term Reliability

Industrial Ethernet connectors are often exposed to:

Dust
Oil
Coolant
Moisture
Metal particles
Cleaning chemicals

Appropriate IP ratings help maintain connector performance in harsh environments.

Typical protection levels include:

IP Rating	Typical Application
IP67	Industrial automation and robotics
IP68	Outdoor automation and renewable energy
IP69K	Food processing and washdown equipment

Environmental sealing protects both electrical contacts and communication reliability.

Validation Beyond Data Speed

A connector should never be selected based solely on its data rate specification.

Comprehensive validation should include:

Vibration testing
Mechanical shock testing
Mating cycle testing
Contact resistance measurement
EMC testing
Cable flex testing
Environmental sealing verification

Testing complete cable assemblies under real operating conditions provides the most reliable performance assessment.

How FPIC Supports Industrial Ethernet Connectivity

FPIC develops high-performance circular connectors, push-pull self-locking connectors, waterproof connectors, and customized connector assemblies for Industrial Ethernet applications.

Our solutions are engineered to provide reliable locking, stable electrical contacts, effective EMC shielding, and long-term durability for robotics, factory automation, machine vision, servo systems, and intelligent manufacturing equipment. With over 23 years of manufacturing experience, FPIC supports customers from design optimization to mass production.

Final Thoughts

Industrial Ethernet performance depends on far more than bandwidth specifications.

Mechanical stability, secure locking, contact reliability, shielding, and environmental protection all contribute to long-term communication performance.

As factories become increasingly connected and automated, connector design plays a vital role in reducing downtime, maintaining stable network communication, and ensuring reliable operation throughout the equipment lifecycle.

FAQ

Why is mechanical stability important for Industrial Ethernet connectors?

Mechanical stability ensures consistent electrical contact under vibration, motion, and shock, reducing communication interruptions and network failures.

Which locking mechanism is best for Industrial Ethernet?

The best locking mechanism depends on the application. Threaded connectors provide excellent vibration resistance, while push-pull connectors offer faster maintenance and secure self-locking.

Do Industrial Ethernet connectors require shielding?

Yes. Shielded connectors help reduce electromagnetic interference (EMI), improve signal integrity, and support reliable high-speed communication.

What IP rating is recommended for Industrial Ethernet connectors?

IP67 is suitable for many factory automation applications, while IP68 or IP69K may be required for outdoor or washdown environments.

How should Industrial Ethernet connectors be tested?

Recommended tests include vibration, EMC, contact resistance, mating cycles, cable flex, mechanical shock, and environmental sealing.

Looking for Reliable Industrial Ethernet Connector Solutions?

FPIC provides high-performance circular connectors, push-pull self-locking connectors, and customized Industrial Ethernet connectivity solutions for robotics, factory automation, machine vision, and intelligent manufacturing. Our engineering team helps customers achieve reliable communication through robust mechanical design, effective shielding, and application-specific connector solutions.

Contact FPIC today to discuss your Industrial Ethernet connector requirements.

Resources

IEC 61076 – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
International standards covering the design, testing, and performance of industrial and circular connectors.
IEC 61158 – Industrial Communication Networks (Fieldbus Specifications)
https://webstore.iec.ch/
Defines communication standards widely used in industrial Ethernet and automation networks.
ODVA – EtherNet/IP Technology Overview
https://www.odva.org/
Provides technical guidance on EtherNet/IP architecture, industrial networking, and physical connectivity.
PROFIBUS & PROFINET International (PI)
https://www.profibus.com/
Offers technical resources for PROFINET communication, connector requirements, and industrial networking best practices.
Phoenix Contact – Industrial Ethernet Connectivity Solutions
https://www.phoenixcontact.com/
Provides engineering resources on Industrial Ethernet connectors, shielding, and reliable network infrastructure.

July 21, 2026/by FPIC

Application Insights, News

How to Choose Circular Connectors for Medical, Industrial and Outdoor Equipment

Circular connectors are widely used because they combine compact size, reliable electrical performance, and excellent environmental protection. From medical imaging systems and industrial robots to outdoor automation and renewable energy equipment, they provide dependable connections for power, signal, and data transmission.

However, there is no universal circular connector suitable for every application. A connector designed for a surgical device may not survive on construction machinery, while an outdoor waterproof connector may be unnecessarily large for laboratory equipment.

Selecting the right connector requires balancing electrical performance, environmental protection, mechanical reliability, and maintenance requirements.

This guide explains the most important factors engineers should consider when choosing circular connectors for different industries.

Start with the Application Environment

Before comparing connector specifications, first understand where the connector will operate.

Typical environments include:

Medical Equipment

Diagnostic systems
Patient monitoring devices
Surgical equipment
Laboratory instruments

Design priorities:

Compact size
Frequent cleaning
High mating reliability
Excellent signal integrity

Industrial Automation

Typical applications include:

Industrial robots
Servo motors
PLC control systems
Machine tools
Factory automation

Design priorities:

Vibration resistance
EMC performance
High mating durability
Reliable locking

Outdoor Equipment

Typical applications include:

Renewable energy systems
Agricultural machinery
Construction equipment
Rail transportation
EV charging infrastructure

Design priorities:

Waterproof sealing
UV resistance
Corrosion resistance
Wide operating temperature

Different environments require different connector designs.

Choose the Appropriate Locking Mechanism

Connector locking directly affects operational reliability.

Common options include:

Push-Pull Locking

Advantages:

Fast connection
One-hand operation
Easy maintenance
Secure automatic locking

Ideal for:

Medical equipment
Laboratory systems
Collaborative robots

Threaded Locking

Advantages:

Excellent vibration resistance
Strong mechanical retention
Long-term stability

Ideal for:

Industrial automation
Servo systems
Heavy equipment

Bayonet Locking

Advantages:

Quick quarter-turn locking
Reliable positioning
Outdoor suitability

Ideal for:

Portable equipment
Field instruments
Mobile machinery

Consider Environmental Protection

Environmental sealing is critical when connectors are exposed to dust, water, oil, or cleaning chemicals.

Common protection levels include:

IP Rating Typical Applications

IP67 Industrial automation, robotics

IP68 Outdoor automation, renewable energy

IP69K Food processing, washdown equipment, heavy-duty vehicles

The required protection level should match the actual operating conditions rather than simply selecting the highest rating available.

Evaluate EMC Requirements

Modern equipment often combines:

Power transmission
Industrial Ethernet
CAN Bus
High-speed data
Precision sensors

Shielded circular connectors help:

Reduce EMI
Improve signal integrity
Maintain communication stability
Support reliable automation

For high-speed communication, connector shielding should include proper 360° shield termination.

Select the Right Contact Configuration

Connector selection also depends on:

Number of contacts
Signal type
Power rating
Mixed power and signal transmission

Many applications combine:

Power contacts
Signal contacts
Data contacts
Ground contacts

Hybrid connectors simplify installation while reducing cable complexity.

Consider Mating Cycle Requirements

Some connectors remain installed for years.

Others are connected and disconnected daily.

Typical examples include:

Low Mating Frequency

Wind turbines
Energy storage systems
Control cabinets

High Mating Frequency

Medical devices
Test equipment
Portable instruments

Applications with frequent reconnection should prioritize connectors designed for thousands of mating cycles.

Material Selection Matters

Connector housing materials influence durability and EMC performance.

Common choices include:

Metal Housing

Advantages:

Better shielding
Higher mechanical strength
Improved heat dissipation

Engineering Plastic Housing

Advantages:

Lightweight
Corrosion resistant
Cost-effective

Material selection should reflect the environmental and mechanical demands of the application.

Validate Before Production

Connector selection should always be verified through testing.

Recommended evaluations include:

Mating cycle testing
Vibration testing
Salt spray testing
IP protection testing
Contact resistance testing
EMC verification
Temperature cycling

Testing complete connector assemblies under actual operating conditions provides the highest confidence in long-term performance.

How FPIC Supports Circular Connector Applications

FPIC develops circular connectors, push-pull self-locking connectors, waterproof connectors, and customized connectivity solutions for medical equipment, industrial automation, robotics, renewable energy, and outdoor applications.

With more than 23 years of manufacturing experience, our engineering team helps customers select the right connector based on electrical performance, environmental requirements, mechanical reliability, and application-specific standards. From prototype development to mass production, FPIC provides dependable connector solutions designed for long-term performance.

Final Thoughts

Choosing the right circular connector involves much more than selecting the correct number of contacts.

Engineers must consider the operating environment, locking mechanism, environmental sealing, EMC performance, durability, and maintenance requirements together

Whether designing a medical device, an industrial robot, or an outdoor energy system, selecting the appropriate connector improves equipment reliability, simplifies maintenance, and reduces lifecycle costs.

FAQ

What factors should be considered when choosing a circular connector?

Key factors include application environment, IP protection, locking mechanism, shielding, contact configuration, mating cycles, and environmental durability.

Which locking mechanism is best for medical equipment?

Push-pull connectors are widely used in medical equipment because they provide fast, secure, one-handed operation and support frequent mating cycles.

Is IP69K always better than IP67?

Not necessarily. The appropriate IP rating should match the operating environment. Higher protection levels may increase size and cost without adding practical benefits.

When are shielded circular connectors required?

Shielded connectors are recommended for applications involving Industrial Ethernet, CAN Bus, servo systems, or environments with significant electromagnetic interference.

Why is mating cycle life important?

Applications requiring frequent connection and disconnection need connectors with high mating durability to maintain reliable electrical performance over time.

Looking for the Right Circular Connector for Your Application?

Whether you’re designing medical equipment, industrial automation systems, or outdoor electrical installations, FPIC provides high-quality circular connectors, push-pull self-locking connectors, and waterproof connectivity solutions tailored to your application. Our engineering team can help you select the ideal connector for reliable performance in demanding environments.

Contact FPIC today to discuss your circular connector requirements.

Resources

IEC 61076 – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
Provides international standards for the design, performance, and testing of circular and industrial connectors.
IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code)
https://webstore.iec.ch/
Defines IP67, IP68, and IP69K protection ratings for connectors used in industrial and outdoor environments.
IEC 60601-1 – Medical Electrical Equipment
https://webstore.iec.ch/
Specifies general safety and essential performance requirements for medical electrical equipment, including connector-related considerations.
Phoenix Contact – Circular Connectors for Industrial Applications
https://www.phoenixcontact.com/
Provides technical information on circular connector selection, industrial connectivity, and environmental protection.
TE Connectivity – Circular Connector Solutions
https://www.te.com/
Offers engineering resources on circular connectors for medical devices, industrial automation, transportation, and energy applications.

July 16, 2026/by FPIC

Engineering & Testing, News

Circular Connector Shield Termination: Common Mistakes That Hurt EMC Performance

As industrial automation systems continue to adopt high-speed communication protocols such as Industrial Ethernet, EtherCAT, PROFINET, and CAN Bus, electromagnetic compatibility (EMC) has become an essential part of circular connector design.

While engineers often focus on cable shielding, one critical detail is frequently overlooked—the shield termination inside the connector.

A high-quality shielded cable can still perform poorly if the shield is improperly terminated. In many EMC failures, the connector itself is not the problem; rather, it is the way the shield is connected.

This article explains the most common shield termination mistakes found in circular connectors and provides practical recommendations for improving EMC performance.

What Is Shield Termination?

Shield termination refers to the method used to electrically connect the cable shield to the connector housing or grounding system.

Its purpose is to:

Maintain shield continuity
Minimize electromagnetic emissions
Improve immunity against external interference
Provide a low-impedance path for high-frequency noise

A properly terminated shield allows electromagnetic energy to flow safely to ground instead of coupling into nearby signal conductors.

Why Shield Termination Matters

Modern industrial equipment contains numerous EMI sources, including:

Servo drives
Frequency inverters
Switching power supplies
Industrial Ethernet
High-speed digital communication
High-current power cables

Without effective shield termination, these noise sources may result in:

Communication failures
Packet loss
Encoder errors
Sensor instability
Unexpected equipment shutdown

Proper shield termination is often the difference between passing and failing EMC testing.

Common Mistake #1: Pigtail Grounding

One of the most common installation mistakes is connecting the shield through a long drain wire or “pigtail.”

Although convenient, this creates additional inductance that significantly reduces shielding effectiveness at high frequencies.

Recommended practice:

Avoid long pigtails.
Use direct 360° shield termination whenever possible.

Common Mistake #2: Incomplete 360° Shield Contact

Some connectors only contact a small portion of the cable braid.

This creates gaps in the shielding path and allows electromagnetic energy to leak.

Good shield termination should provide:

Full circumferential contact
Uniform pressure
Continuous metal-to-metal connection

Complete 360° termination offers substantially better EMC performance.

Common Mistake #3: Poor Shield Continuity

The shield should remain electrically continuous from one connector to the other.

Common problems include:

Broken braid
Damaged foil
Poor crimping
Loose shield clamps
Oxidized metal surfaces

Even small discontinuities may reduce shielding effectiveness.

Common Mistake #4: Incorrect Grounding Strategy

Shield grounding depends on system architecture.

Single-end grounding may reduce low-frequency ground loops.

Dual-end grounding generally provides better high-frequency EMC performance.

The appropriate strategy should be selected according to:

Operating frequency
Equipment layout
Grounding system
EMC requirements

There is no universal solution for every application.

Common Mistake #5: Ignoring Connector Housing Material

Plastic connector shells provide little shielding capability.

For demanding industrial environments, engineers often prefer:

Metal circular connectors
Conductive connector shells
Nickel-plated housings
Aluminum alloy housings

Metal housings improve overall shielding continuity and EMC performance.

Selecting Connectors for High EMC Applications

When selecting circular connectors for robotics, industrial automation, or energy storage systems, engineers should evaluate:

360° shield termination
Metal housing
Shield continuity
Contact resistance
IP protection level
Vibration resistance
Mating cycle durability

Connector performance should be evaluated as part of the complete cable assembly rather than as an individual component.

Verifying Shield Performance

Proper shield termination should be validated through testing.

Typical evaluations include:

Shield continuity measurement
Contact resistance testing
Radiated emission testing
Conducted emission testing
EMC immunity testing
High-frequency impedance measurement
Cable flex testing

Laboratory verification ensures consistent EMC performance before production.

Industry Standards

Shielded circular connectors commonly reference:

IEC 61000 Series — Electromagnetic Compatibility (EMC)
IEC 61076 Series — Connectors for Electronic Equipment
CISPR 11 — Industrial Equipment Emissions
CISPR 32 — Multimedia Equipment EMC Requirements
IEC 60512 — Connector Mechanical and Electrical Tests

Compliance with these standards helps ensure reliable operation in industrial environments.

How FPIC Supports EMC Connector Solutions

FPIC develops circular connectors, push-pull self-locking connectors, and customized connector assemblies for industrial automation, robotics, medical devices, and energy storage applications.

Our engineering team focuses on optimized shield termination, reliable connector grounding, and robust mechanical design to help customers achieve stable signal transmission and improved EMC performance in demanding environments.

Final Thoughts

Shield termination is one of the most important—but often overlooked—factors affecting connector EMC performance.

Even the highest-quality shielded cable cannot compensate for poor connector termination.

By using proper 360° shield termination, maintaining continuous shielding, selecting appropriate connector materials, and validating EMC performance, engineers can significantly improve communication reliability and reduce electromagnetic interference.

As industrial communication speeds continue to increase, connector shield termination will play an even greater role in system performance.

FAQ

What is shield termination in a circular connector?

Shield termination is the electrical connection between the cable shield and the connector housing or grounding system, providing a controlled path for electromagnetic noise.

Why is a 360° shield termination better than a pigtail?

A 360° termination minimizes high-frequency impedance and provides continuous shielding around the cable, while pigtails introduce inductance that reduces EMC performance.

Do metal connector housings improve EMC?

Yes. Metal housings help maintain shield continuity and provide better electromagnetic shielding than plastic housings.

Should cable shields be grounded at one end or both ends?

The best grounding method depends on operating frequency, grounding architecture, and EMC requirements. High-frequency applications often benefit from dual-end grounding.

How is shield termination verified?

Common tests include shield continuity, contact resistance, EMC emissions, immunity testing, and high-frequency performance evaluation.

Looking for High-Performance Shielded Circular Connectors?

Reliable EMC performance begins with proper connector design. FPIC provides shielded circular connectors, push-pull self-locking connectors, and custom connector solutions engineered for industrial automation, robotics, medical equipment, and energy storage systems. Our engineering team supports customers with optimized shielding, connector integration, and reliable manufacturing for demanding applications.

Contact FPIC today to discuss your EMC connector requirements.

Resources

IEC 61000 Series – Electromagnetic Compatibility (EMC)
https://webstore.iec.ch/
International EMC standards covering electromagnetic emissions, immunity, and grounding practices.
IEC 61076 Series – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
Provides international standards for the design, testing, and performance of circular and industrial connectors.
IEC 60512 – Connectors for Electronic Equipment – Tests and Measurements
https://webstore.iec.ch/
Specifies mechanical, electrical, and environmental test methods for connector assemblies.
Phoenix Contact – EMC Connection Technology
https://www.phoenixcontact.com/
Explains shield termination, grounding concepts, and EMC best practices for industrial connectors.
TE Connectivity – EMC Shielding Solutions for Industrial Connectivity
https://www.te.com/
Provides technical guidance on connector shielding, 360° shield termination, and high-speed industrial communication.

July 10, 2026/by FPIC

News, Selection Guides

Connector Selection for Robotics: Locking, Shielding and Cable Exit Considerations

Industrial robots operate in demanding environments where connectors are exposed to constant motion, vibration, electromagnetic interference (EMI), and frequent maintenance. While much attention is often given to servo motors and robot controllers, connector selection is equally important for ensuring reliable power delivery and stable signal transmission.

A poorly selected connector can loosen under vibration, introduce communication errors, restrict cable movement, or shorten cable life. Choosing the right connector requires more than matching the voltage and current ratings—it involves evaluating the complete operating environment.

This article explains the key considerations when selecting connectors for robotic systems, focusing on locking mechanisms, EMC shielding, cable exit orientation, and long-term durability.

Why Connector Selection Matters in Robotics

Unlike stationary industrial equipment, robotic systems perform continuous multi-axis movements that repeatedly bend, twist, and accelerate cables.

Connectors must therefore withstand:

Continuous vibration
Frequent movement
Mechanical shock
Electromagnetic interference
Repeated mating cycles
Limited installation space

Connector reliability directly influences machine uptime and maintenance costs.

Choosing the Right Locking Mechanism

One of the most critical connector features is the locking system.

A connector that loosens during robot operation can interrupt power or communication, causing unexpected machine stops.

Common locking mechanisms include:

Threaded Locking

Advantages:

Excellent vibration resistance
High mechanical strength
Suitable for industrial automation

Applications:

Servo motors
Industrial robots
Machine tools

Push-Pull Locking

Advantages:

Quick connection and disconnection
Secure automatic locking
Compact design
Fast maintenance

Applications:

Collaborative robots (Cobots)
Medical robots
Inspection equipment
Automated production lines

Bayonet Locking

Advantages:

Fast quarter-turn locking
Good vibration performance
Reliable positioning

Applications:

Mobile robots
Outdoor equipment
Industrial machinery

Selecting the locking method should balance installation efficiency with vibration resistance.

Why Shielding Is Essential

Modern robots contain numerous high-speed electrical devices, including:

Servo drives
Frequency converters
Industrial Ethernet
Encoders
Vision systems

These devices generate electromagnetic interference that may affect communication signals.

Shielded connectors help:

Reduce EMI
Improve signal integrity
Lower communication errors
Support high-speed data transmission

Proper shield continuity between cable and connector is essential for achieving effective EMC performance.

Selecting the Best Cable Exit Direction

Cable exit orientation is often overlooked during connector selection.

However, it directly affects cable stress and available installation space.

Typical exit options include:

Straight Exit

Best for:

Open installation space
Linear cable routing
Easy assembly

Right-Angle Exit

Best for:

Compact robot joints
Tight cabinet layouts
Reduced bending stress
Improved cable management

Proper cable exit selection helps extend cable flex life and minimizes mechanical strain near the connector.

Environmental Protection Requirements

Robots frequently operate in challenging environments.

Connector selection should consider:

Dust
Water spray
Oil
Coolant
Metal particles
Cleaning chemicals

Depending on the application, connectors may require:

IP67 protection
IP68 protection
IP69K protection

Environmental sealing improves long-term reliability and reduces maintenance frequency.

Connector Durability and Mating Cycles

Industrial robots often require periodic replacement of end effectors or tooling.

Frequent connection and disconnection demand connectors with long mating life.

Typical industrial requirements include:

More than 500 insertion cycles
2,000–5,000 cycles for automation equipment
Higher durability for collaborative robots and testing equipment

Gold-plated contacts further improve contact stability and corrosion resistance.

Size and Weight Considerations

As robots become smaller and faster, connector size becomes increasingly important.

Compact connectors provide:

Lower moving mass
Improved joint flexibility
Easier cable routing
Better space utilization

Miniaturization is especially important in collaborative robots and precision automation equipment.

Validation Before Deployment

Connectors should be validated under realistic operating conditions.

Recommended tests include:

Vibration testing
Mechanical shock testing
Cable flex testing
Salt spray testing
Contact resistance measurement
Insertion and extraction force testing
EMC verification
Environmental sealing tests

System-level validation provides the highest confidence in connector performance.

How FPIC Supports Robotics Connector Solutions

FPIC develops high-performance connector solutions for industrial automation, robotics, and intelligent manufacturing.

Our product portfolio includes push-pull self-locking connectors, circular connectors, waterproof connectors, and customized connector assemblies designed for demanding robotic applications. With over 23 years of manufacturing experience, FPIC supports customers from rapid prototyping through mass production, providing reliable connectivity solutions that improve equipment uptime and long-term performance.

Final Thoughts

Selecting the right connector for robotic applications involves much more than matching electrical specifications.

Locking mechanisms, shielding performance, cable exit orientation, environmental protection, and durability all influence system reliability.

As robotic systems continue to become faster, smarter, and more compact, connector design plays an increasingly important role in maintaining stable operation and reducing maintenance costs.

FAQ

Why are locking connectors important in robotics?

Locking mechanisms prevent accidental disconnection caused by vibration, motion, or mechanical shock, improving system reliability.

When should shielded connectors be used?

Shielded connectors are recommended whenever high-speed communication or servo systems operate in environments with significant electromagnetic interference.

Which cable exit is better, straight or right-angle?

It depends on available space and cable routing. Right-angle exits are often preferred in compact robot joints to reduce bending stress.

What IP rating is recommended for industrial robots?

Many industrial robots require IP67 protection, while washdown or outdoor applications may require IP68 or IP69K connectors.

How are robotics connectors validated?

Typical validation includes vibration, cable flex, EMC, sealing, mating cycle, and contact resistance testing.

Looking for Reliable Connectors for Robotics and Industrial Automation?

FPIC provides high-performance connector solutions for industrial robots, collaborative robots, servo systems, and automated equipment. From push-pull self-locking connectors to waterproof circular connectors, our engineering team helps customers select the right connectivity solution for demanding motion applications.

Contact FPIC today to discuss your robotics connector requirements.

Resources

IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code)
https://webstore.iec.ch/
Defines IP ratings such as IP67, IP68, and IP69K for connector protection against dust and water ingress.
IEC 61076 – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
International standards covering the design, performance, and testing of industrial connectors.
ODVA – EtherNet/IP Physical Layer and Industrial Connectivity
https://www.odva.org/
Provides technical guidance on industrial Ethernet connectivity and connector performance in automation systems.
TE Connectivity – Industrial Robotics Connectivity Solutions
https://www.te.com/
Explains connector technologies, shielding solutions, and rugged interconnect systems for robotics and automation.
Phoenix Contact – Connectors for Industrial Automation
https://www.phoenixcontact.com/
Offers technical resources on circular connectors, EMC protection, and reliable industrial connectivity.

July 10, 2026/by FPIC

Engineering & Testing, News

IP67 vs IP68 vs IP69K Connectors: What the Ratings Really Mean in Field Use

When selecting industrial connectors, one of the first specifications engineers notice is the IP rating. Products are commonly advertised as IP67, IP68, or IP69K, often implying that a higher number automatically means better protection.

However, this assumption is not always correct.

Each protection level is designed for different environmental conditions, and choosing the wrong rating can either reduce equipment reliability or unnecessarily increase product cost.

This article explains what IP67, IP68, and IP69K ratings actually mean, how they are tested, and how engineers should interpret these ratings in real-world applications.

Understanding the IP Rating System

The Ingress Protection (IP) rating is defined by IEC 60529, an international standard used to classify the degree of protection provided by electrical enclosures against solid particles and liquids.

An IP rating consists of two digits.

The first digit indicates protection against solid objects and dust.
The second digit indicates protection against water.

For industrial connectors, the first digit is commonly 6, representing complete protection against dust ingress.

The primary difference between IP67, IP68, and IP69K lies in their resistance to water under different conditions.

What Does IP67 Mean?

IP67 is one of the most common protection ratings used in industrial automation.

A connector meeting IP67 requirements must:

Be completely dust-tight (IP6X)
Withstand temporary immersion in water up to 1 meter for 30 minutes

Typical Applications

IP67 connectors are commonly used in:

Industrial automation equipment
Sensors
Factory machinery
AGVs
Warehouse automation
Outdoor lighting

What IP67 Does Not Mean

One common misconception is that IP67 connectors are suitable for continuous underwater operation.

In reality, IP67 is designed for temporary immersion only. Continuous submersion may eventually compromise the sealing system unless the connector is specifically designed for that environment.

What Does IP68 Mean?

IP68 provides protection against continuous immersion.

Unlike IP67, IEC 60529 does not specify a fixed immersion depth or duration.

Instead, the manufacturer defines the test conditions.

Typical examples include:

2 meters for 24 hours
5 meters for 48 hours
Other application-specific requirements

Because of this flexibility, two IP68 connectors may have significantly different underwater performance.

Typical Applications

IP68 connectors are often selected for:

Marine equipment
Underground monitoring systems
Water treatment facilities
Outdoor telecommunications
Renewable energy systems

When comparing IP68 products, engineers should always verify the manufacturer’s immersion specifications rather than relying solely on the IP rating.

What Does IP69K Mean?

IP69K addresses a completely different challenge.

Instead of prolonged immersion, IP69K evaluates resistance to high-pressure, high-temperature water jets.

During testing, connectors are exposed to:

Water temperatures up to 80°C
Pressures around 80–100 bar
Spray angles of 0°, 30°, 60°, and 90°
Rotating spray conditions

The objective is to verify sealing performance during aggressive cleaning processes.

Typical Applications

IP69K connectors are widely used in:

Food processing equipment
Beverage production
Pharmaceutical manufacturing
Agricultural machinery
Construction equipment
Commercial vehicles

Frequent washdown environments often require IP69K rather than IP68.

IP67 vs IP68 vs IP69K: A Practical Comparison

Feature	IP67	IP68	IP69K
Dust Protection	Yes	Yes	Yes
Temporary Water Immersion	✔	✔	Not primary purpose
Continuous Submersion	Limited	✔	Not designed for this
High-Pressure Washdown	✖	Limited	✔
High-Temperature Cleaning	✖	✖	✔

The table shows that none of these ratings is universally “better.” Each addresses a different environmental challenge.

Common Misconceptions About IP Ratings

Higher IP Ratings Are Not Always Better

Selecting IP69K for a machine that only requires occasional rain exposure may increase cost without providing additional practical benefits.

Conversely, using IP67 in a high-pressure washdown environment may result in premature seal failure.

IP68 Is Not a Universal Underwater Rating

Because manufacturers define immersion conditions, engineers should always request the specific IP68 test parameters.

Connector Design Matters

Even when connectors share the same IP rating, long-term field performance depends on factors such as:

sealing materials
connector locking mechanism
cable gland quality
installation practices
maintenance procedures

Proper installation is just as important as connector selection.

Additional Factors Beyond the IP Rating

An IP rating only evaluates protection against dust and water.

Industrial connector selection should also consider:

vibration resistance
operating temperature
UV resistance
chemical compatibility
mating cycle life
corrosion resistance
EMC shielding

In harsh environments, these characteristics often determine connector reliability more than the IP rating itself.

Validation in Real Applications

Field validation should include tests that reflect actual operating conditions.

Typical validation activities include:

water immersion testing
pressure wash testing
thermal cycling
vibration testing
salt spray testing
connector durability testing
sealing inspection after repeated mating cycles

Laboratory certification alone does not guarantee long-term field reliability.

How FPIC Supports Sealed Connector Development

Selecting the correct protection level requires understanding the actual operating environment rather than simply choosing the highest IP rating.

FPIC develops custom connector and cable assembly solutions for industrial automation, robotics, energy storage, transportation, medical equipment, and harsh-environment applications. Our engineering team supports customers in selecting sealing structures, connector configurations, and validation methods that match real operating conditions while balancing performance, durability, and cost.

Final Thoughts

IP67, IP68, and IP69K are often misunderstood as progressive levels of waterproof performance.

In reality, each rating addresses different environmental conditions.

Understanding the testing methods behind these ratings allows engineers to make better connector selections, improve equipment reliability, and avoid unnecessary costs.

Rather than asking which rating is higher, the more important question is:

Which rating best matches the actual application?

FAQ

Is IP69K better than IP68?

Not necessarily. IP69K is designed for high-pressure, high-temperature washdown, while IP68 is intended for continuous water immersion.

Can an IP67 connector be used underwater?

Only for temporary immersion. Continuous underwater applications generally require a connector specifically qualified for IP68 conditions.

Does IP68 always mean the same immersion depth?

No. The immersion depth and duration are defined by the manufacturer and should always be verified.

Are IP69K connectors also dustproof?

Yes. Like IP67 and IP68, IP69K connectors provide complete protection against dust ingress.

What other factors should be considered besides IP ratings?

Engineers should also evaluate vibration resistance, temperature range, UV resistance, chemical compatibility, mating cycle life, and corrosion resistance.

Looking for Reliable Sealed Connector Solutions?

Choosing the right IP rating is only one part of connector selection. FPIC provides custom sealed connectors and cable assemblies engineered for demanding industrial environments, helping customers improve equipment reliability while avoiding unnecessary design costs.

Contact FPIC today to discuss your application requirements.

Resources

IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code): Defines the international IP rating system, including IP67 and IP68 test requirements.
ISO 20653 – Road Vehicles – Degrees of Protection (IP Code): Specifies IP69K testing methods for high-pressure, high-temperature water jet protection used in automotive and industrial applications.
Phoenix Contact – IP Protection Classes Explained: Explains how IP ratings apply to industrial connectors and highlights practical selection considerations.
TE Connectivity – Sealed Connector Solutions: Discusses sealing technologies, environmental performance, and connector selection for harsh environments.
UL Solutions – Environmental Testing Services: Provides an overview of environmental validation methods, including water ingress, thermal cycling, and durability testing.

June 26, 2026/by FPIC

Application Insights, News

Single Pair Ethernet Connectors in Industrial Automation: What to Watch in 2026

Industrial automation networks are entering a new phase of connectivity.

For decades, factory communication systems have relied on:

Fieldbus networks
Industrial Ethernet
M8 and M12 connectors
RJ45 interfaces
Multi-pair communication cables

Today, Single Pair Ethernet (SPE) is emerging as one of the most important technologies supporting Industry 4.0, IIoT, and smart manufacturing initiatives.

While SPE has been discussed for several years, 2026 is expected to be a significant milestone as more industrial equipment manufacturers move from pilot projects to commercial deployment.

For engineers, OEM buyers, and system integrators, understanding upcoming SPE connector trends can help guide future product and infrastructure decisions.

Why SPE Is Gaining Momentum

Industrial networks continue to evolve toward greater connectivity.

Factories now require:

more sensors
more data collection
more edge devices
more intelligent actuators

Traditional Ethernet remains effective, but many field-level devices do not require the size and complexity of four-pair Ethernet infrastructure.

Single Pair Ethernet offers:

reduced cable size
lighter harnesses
simplified installation
Ethernet-based communication down to the sensor level

This makes SPE highly attractive for next-generation automation architectures.

Trend #1: Increasing Adoption of IEC 63171 Connector Standards

One of the biggest developments to watch in 2026 is the growing acceptance of IEC 63171 connector standards.

These standards define connector interfaces for SPE applications.

Common variants include:

IEC 63171-2
IEC 63171-5
IEC 63171-6

As more automation suppliers adopt standardized interfaces, interoperability across equipment platforms is expected to improve.

For buyers, connector standard compatibility will become an increasingly important procurement criterion.

Trend #2: Expansion of SPE in Smart Sensors and Actuators

Many industrial sensors currently use:

discrete I/O
fieldbus interfaces
proprietary communication methods

SPE enables direct Ethernet connectivity to field devices.

Benefits include:

simplified architectures
real-time diagnostics
easier device integration
reduced gateway requirements

By 2026, more sensor and actuator manufacturers are expected to release SPE-enabled products.

Trend #3: Growth of Power over Data Line (PoDL)

Power over Data Line (PoDL) remains one of the most compelling SPE features.

PoDL allows:

data transmission
device power

through the same twisted pair.

Potential advantages include:

fewer cables
reduced installation costs
smaller harnesses
simplified device deployment

As SPE ecosystems mature, PoDL adoption is expected to accelerate across industrial automation markets.

Trend #4: Smaller and More Compact Industrial Devices

Machine builders continue to pursue:

smaller equipment footprints
higher device density
reduced cabinet space

SPE connectors support these goals through:

compact connector designs
reduced cable diameter
lighter cable assemblies

This trend is particularly important in:

robotics
machine vision
semiconductor equipment
compact automation cells

Connector miniaturization will remain a major development focus in 2026.

Trend #5: Stronger Focus on EMC Performance

As industrial networks become more data-driven, communication reliability becomes increasingly critical.

Industrial environments contain significant sources of electromagnetic interference:

servo drives
VFDs
motors
switching power supplies

Although SPE cables are smaller, EMC challenges remain.

Future SPE connector development will likely emphasize:

improved shielding
lower transfer impedance
optimized grounding
enhanced connector shielding continuity

EMC performance will continue to be a key differentiator among suppliers.

Trend #6: More SPE Solutions for Robotics

Robotic systems require communication solutions that can withstand:

continuous flexing
torsion
vibration

As robots become more connected, SPE presents an opportunity to simplify communication architectures.

However, robotic SPE cable assemblies must still address:

dynamic motion
shielding durability
flex life requirements

2026 may see a broader range of SPE products specifically designed for robotic applications.

Trend #7: Integration with Industry 4.0 Architectures

Industry 4.0 initiatives emphasize:

unified communication
real-time data access
device interoperability

SPE aligns closely with these goals.

Benefits include:

end-to-end Ethernet connectivity
simplified networking
easier data collection
scalable architectures

Many manufacturers view SPE as a foundational technology for future smart factories.

Trend #8: Growing Demand for Hybrid Connectivity Solutions

The transition to SPE will not happen overnight.

Many facilities will operate mixed environments including:

traditional Ethernet
fieldbus networks
SPE networks

As a result, demand is growing for:

SPE-to-Ethernet adapters
hybrid cable assemblies
migration-friendly connectivity solutions

Suppliers that support both legacy and emerging standards may have a competitive advantage.

Trend #9: Higher Expectations for IP Protection

Industrial users continue to demand robust environmental protection.

Common requirements include:

IP67

Factory automation equipment.

IP68

Harsh industrial environments.

IP69K

Washdown applications.

Future SPE connectors will need to maintain industrial-grade sealing despite smaller form factors.

Trend #10: Supplier Qualification Will Become More Important

As SPE adoption grows, buyers will increasingly evaluate suppliers based on:

connector standard compliance
EMC performance
environmental testing
manufacturing quality
application engineering support

Selecting the right connectivity partner may become as important as selecting the connector itself.

Challenges That Still Need Attention

Although SPE offers significant advantages, several challenges remain.

Standard Fragmentation

Multiple connector standards continue to coexist.

Ecosystem Maturity

Some industrial markets are still in the early adoption phase.

Infrastructure Transition

Existing Ethernet systems remain deeply established.

Education and Training

Many engineers are still learning SPE design principles.

These factors will influence adoption rates over the coming years.

Questions Buyers Should Ask in 2026

Before selecting SPE connector solutions, buyers should ask:

Which IEC 63171 standard is supported?
Is PoDL available?
What EMC testing has been completed?
What IP protection level is achieved?
Is the connector suitable for robotics or drag-chain applications?
What interoperability testing has been performed?
How does the supplier support future scalability?

Typical Applications Expected to Grow

SPE connectors are expected to expand across:

Smart sensors
Intelligent actuators
Industrial IoT devices
Edge computing equipment
Robotics
Machine vision systems
Process automation
Smart manufacturing platforms

How FPIC Supports Emerging SPE Connectivity Needs

FPIC develops advanced industrial connectivity solutions including:

SPE cable assemblies
Industrial Ethernet harnesses
M8 and M12 communication cables
Shielded data cable assemblies
Robotic communication harnesses
Custom overmolded connector solutions

Our engineering team helps customers evaluate emerging connectivity technologies while maintaining compatibility with current industrial infrastructure.

Final Thoughts

Single Pair Ethernet connectors are moving from concept to practical deployment.

In 2026, key developments are expected around:

IEC 63171 standard adoption
PoDL expansion
connector miniaturization
robotics integration
Industry 4.0 implementation
EMC optimization

For OEMs and industrial buyers, now is the time to understand SPE technologies and prepare for the next generation of industrial networking.

Organizations that evaluate SPE early may gain advantages in system simplification, scalability, and future connectivity readiness.

FAQ

What is a Single Pair Ethernet connector?

An SPE connector is a connector designed to transmit Ethernet communication through a single twisted pair of conductors.

What is PoDL?

Power over Data Line (PoDL) enables both power and data transmission over the same SPE cable.

Will SPE replace Industrial Ethernet?

Not immediately. SPE is expected to complement existing Ethernet infrastructure, particularly at the device level.

Which SPE connector standards are most important?

IEC 63171-2, IEC 63171-5, and IEC 63171-6 are among the most widely discussed industrial SPE connector standards.

Why is SPE important for Industry 4.0?

SPE enables direct Ethernet connectivity to sensors and actuators, supporting unified and scalable industrial communication architectures.

Planning for Next-Generation Industrial Connectivity?

FPIC provides custom SPE cable assemblies, Industrial Ethernet harnesses, M8/M12 connectivity solutions, and engineering support for automation, robotics, and Industrial IoT applications.

Contact us to discuss your future Single Pair Ethernet connectivity requirements.

Resources

IEC 63171 Series – Single Pair Ethernet Connector Standards
IEEE 802.3cg – 10BASE-T1L and 10BASE-T1S Standards
PROFIBUS & PROFINET International (PI) SPE Resources
ODVA Single Pair Ethernet Guidance
Phoenix Contact and HARTING SPE Technology Documentation

Source References: IEC 63171, IEEE 802.3cg, PI, ODVA, Phoenix Contact, HARTING SPE technical resources.

June 22, 2026/by FPIC