Introduction
Many electronic systems have specialized electrical and environmental requirements that cannot always be met by standard connector configurations. Equipment may require unusual contact arrangements, specific mounting dimensions, customized cable interfaces, or particular sealing characteristics. In these situations, custom hermetic connectors can provide a solution designed around the needs of the application.
Custom designs are used in industries such as aerospace, medical technology, scientific research, industrial automation, and defense. Their purpose is to combine the required electrical connection with the sealing performance and mechanical characteristics of the complete system.
Why Custom Hermetic Connectors Are Needed
Standard connectors are available in many sizes and configurations, but some projects have unique design limitations. An enclosure may have limited installation space, a non-standard mounting opening, or a specific number of electrical contacts.
Other applications may require unusual voltage ratings, high-current contacts, specialized signal connections, or compatibility with a particular cable assembly.
Custom hermetic connectors allow engineers to define the connector geometry and specifications according to these requirements. However, customization should begin with a clear understanding of the equipment’s operating conditions and performance objectives.
Contact Arrangement and Electrical Requirements
One of the first design considerations is the electrical contact arrangement. Engineers must determine the number of contacts, contact spacing, conductor size, voltage, current, and signal characteristics.
The connector may need to support power transmission, low-level signals, or a combination of both. Contact materials and insulation spacing should be selected to meet the required electrical performance.
A custom hermetic electrical feedthrough may be designed with a specific pin layout or contact configuration to match the internal and external wiring of the equipment.
Sealing Technology and Environmental Requirements
The sealing technology must be appropriate for the application’s operating environment. Glass-to-metal and ceramic-to-metal sealing are commonly used in hermetic connector designs.
The choice depends on temperature, pressure, leakage requirements, electrical insulation, and mechanical conditions. A vacuum application may require different specifications from an industrial system exposed to pressure or moisture.
A custom hermetic feedthrough should be designed to preserve the required enclosure boundary. Engineers should define acceptable leakage limits and testing procedures before manufacturing begins.
Custom Wire and Cable Configurations
Some applications require individual wires to pass through a sealed enclosure, while others need multi-conductor cable assemblies. These arrangements may require a specialized connector design.
A custom hermetic wire feedthrough can be developed around conductor dimensions, insulation materials, cable layout, and installation requirements. The design must account for the interaction between the cable and the sealing components.
Strain relief and cable support are also important. Mechanical movement should not place unnecessary stress on the sealed interface.
Material and Mechanical Design
Custom connectors must use materials suitable for their operating conditions. Housing metals, contacts, insulating materials, and sealing components should be compatible.
The mechanical design should account for mounting dimensions, wall thickness, vibration, shock, and pressure loading. If the connector will be permanently joined to an enclosure, the joining method must also be considered.
Thermal expansion compatibility is especially important where different materials are bonded together. Poor material matching can create stress that affects the seal over time.
Benefits of Customization
A custom connector can provide a closer fit with the equipment’s electrical and mechanical architecture. It may reduce the need for additional adapters, simplify cable routing, and support installation within restricted spaces.
Customization can also allow engineers to specify the required contact arrangement and sealing characteristics rather than adapting the system around a standard product.
However, custom designs may involve additional engineering, prototyping, testing, and manufacturing time. Project teams should consider these factors when planning development schedules and budgets.
Prototyping and Qualification
Before full production, a custom hermetic connector may require prototype development and evaluation. The prototype can be checked for dimensional accuracy, electrical performance, sealing integrity, and mechanical suitability.
Testing may include leak detection, insulation resistance, dielectric strength, pressure evaluation, thermal cycling, and vibration testing. The exact requirements depend on the application.
Manufacturers and customers should agree on specifications and acceptance criteria before production begins. This reduces the possibility of misunderstandings about performance expectations.
Working With a Manufacturer
A successful custom connector project requires clear communication between the engineering team and manufacturer. Drawings, electrical specifications, operating conditions, mounting details, cable requirements, and testing expectations should be provided as early as possible.
Manufacturers can then evaluate feasibility and recommend appropriate materials and sealing methods. Reviewing prototypes and test documentation before approving production is an important part of the process.
Conclusion
Custom hermetic connectors are valuable when standard products cannot fully satisfy an application’s electrical, mechanical, or environmental requirements. Their design can be tailored to specific contact arrangements, cable configurations, mounting dimensions, and sealing needs.
