Electrical connectors may appear to be relatively simple components, but their performance can influence the reliability of an entire system.
In aerospace and industrial environments, connectors may carry power, sensor data, communication signals, or control information while being exposed to vibration, moisture, temperature changes, chemicals, and mechanical stress.
Specialized hermetic connectors are designed for applications that require secure electrical performance in challenging environments. Their construction helps protect internal components while supporting reliable signal and power transmission.
Start With Electrical Requirements
Connector selection begins with the electrical characteristics of the system.
Voltage, current, signal frequency, contact resistance, insulation resistance, and grounding requirements all influence the design.
High-current circuits may require larger contacts and additional thermal consideration.
High-frequency signals may need controlled impedance and effective shielding.
Sensitive sensors may require low-noise connections.
Electrical requirements should therefore be established before mechanical packaging decisions are finalized.
Evaluate the Operating Environment
A connector used in an office machine has very different requirements from one installed on an aircraft or industrial production line.
Temperature range is one important consideration.
High temperatures can accelerate material aging, while low temperatures can make some materials brittle.
Moisture, dust, pressure, chemicals, and radiation may also influence connector performance.
Engineers should consider both normal operation and unusual events such as cleaning, transportation, maintenance, or emergency conditions.
Consider Vibration and Mechanical Loads
Aerospace and industrial machinery can expose connectors to significant vibration.
Repeated movement may loosen threaded connections, stress cables, or wear contact surfaces.
Locking mechanisms, appropriate mounting, and strain relief can improve mechanical reliability.
Cable routing also matters.
A heavy or poorly supported cable can transfer force directly to the connector, increasing the risk of damage.
Material Selection Matters
Connector materials must maintain electrical and mechanical performance in the expected environment.
Contact materials influence conductivity, corrosion resistance, and wear.
Connector body materials affect weight, strength, and environmental durability.
Insulating materials need sufficient electrical strength while remaining stable under temperature and chemical exposure.
The surrounding system materials should also be considered to avoid corrosion or thermal expansion problems.
Sealing Requirements Vary
Not every application needs the same level of environmental sealing.
A factory connector exposed to occasional dust may require relatively basic protection. A connection crossing a pressure boundary or operating in a vacuum may require much more stringent control.
Engineers should define the specific environmental threat rather than simply asking for the highest possible sealing level.
This approach helps balance reliability, cost, weight, and serviceability.
Size and Weight Can Be Critical
Aerospace systems frequently place tight restrictions on weight and available space.
Compact connectors may help reduce system size, but increased contact density can create additional design challenges.
Industrial equipment may provide more space but require greater mechanical robustness.
Connector selection therefore involves trade-offs between size, contact count, current capacity, durability, and ease of installation.
Maintenance Requirements Influence Design
Some connectors may be disconnected frequently during servicing, while others may remain untouched for years.
Frequent mating cycles require contacts and mechanical features that tolerate repeated use.
Connectors installed in inaccessible locations may prioritize long-term durability instead.
Technician access should also be considered.
A connector that is difficult to reach or identify can increase maintenance time and the risk of incorrect installation.
Check Compatibility With the Complete Cable Assembly
A connector should not be selected independently from its cable.
Wire size, shielding, insulation, flexibility, environmental rating, and strain relief all need to work together.
Cable termination methods can also influence long-term reliability.
Poorly executed crimping, soldering, or assembly can undermine the performance of an otherwise high-quality connector.
Qualification Testing Provides Confidence
Testing helps verify whether the connector and cable assembly can survive realistic conditions.
Depending on the application, tests may include vibration, shock, temperature cycling, humidity, pressure, chemical exposure, electrical load, or repeated mating.
Aerospace and safety-critical industrial applications may require particularly rigorous qualification procedures.
The Best Connector Matches the Application
There is no universal connector design suitable for every system.
A successful choice balances electrical requirements, environmental conditions, mechanical stresses, size, weight, maintainability, manufacturing processes, and cost.
Careful connector selection early in the design process can prevent reliability problems that would otherwise be difficult and expensive to correct later.
