Overview
Rectangular Hermetic Connectors are engineered to maintain airtight seals while providing electrical connectivity in demanding applications. Unlike standard connectors, they prevent gas/liquid permeation through advanced sealing technologies like glass-to-metal or ceramic-to-metal bonding. Their rectangular form factor allows for higher pin counts in compact spaces compared to circular designs. These connectors are critical in industries where environmental integrity is paramount. For example, in satellite systems, they prevent outgassing that could interfere with sensitive instruments. Medical implantable devices also rely on them to isolate internal electronics from bodily fluids.
Structure and Working Principle
The connector consists of a metal shell (typically stainless steel 316L or aluminum 6061) housing precision contacts sealed with insulating materials. Glass-sealed versions use matched expansion coefficients between metal and glass to create permanent seals during high-temperature firing processes. Ceramic variants employ brazing techniques for superior thermal resilience. Hermeticity is achieved through multiple barriers: primary seals around individual pins, secondary gaskets at housing interfaces, and often epoxy backfills. Testing methods include helium leak detection (<1×10⁻⁹ atm·cc/sec) and bubble testing under pressurized liquids. The rectangular design facilitates organized contact arrangements for complex wiring systems.
Key Features
1. Pressure Tolerance: Rated for 5-100+ psi differentials depending on design. 2. Temperature Range: Typically -65°C to +200°C for standard models. 3. EMI Shielding: Metal housings provide 60-100dB attenuation. 4. Contact Options: Gold-plated pins for low-resistance connections in milliamp circuits. Advanced versions offer self-cleaning contacts for high-vibration environments and modular configurations allowing mixed signal/power/coaxial contacts. Military-spec models (MIL-DTL-38999 Series IV) include threaded coupling mechanisms for secure mating under shock/vibration.
Application Areas
Aerospace: Aircraft engine monitoring sensors, space vehicle payload interfaces. Defense: Submarine sonar arrays, UAV communication systems. Medical: MRI machine components, implantable neurostimulators. Industrial: Deep-sea ROVs, semiconductor processing equipment. In oil/gas applications, they enable downhole instrumentation to withstand 15,000psi pressures and H₂S exposure. For scientific research, they facilitate vacuum chamber instrumentation without compromising ultra-high vacuum (UHV) conditions below 10⁻⁹ torr.
Maintenance and Precautions
Prevent seal degradation by avoiding organic solvents during cleaning—use only approved isopropyl alcohol wipes. Periodic inspections should check for housing corrosion or contact fretting (visible as black powder on gold plating). During installation, adhere strictly to specified torque values (usually 5-15 in-lbs) to avoid distorting sealing surfaces. Mating/unmating cycles are typically rated for 500-5,000 cycles—exceeding this may compromise hermeticity. Storage recommendations include silica gel desiccant in sealed bags to prevent moisture absorption in ceramic components.
B2B Procurement Guide
Specify: 1. Environmental requirements (pressure, temperature, fluid exposure). 2. Electrical parameters (voltage rating, contact resistance). 3. Mechanical needs (mating cycles, shock/vibration specs). 4. Certifications (MIL-SPEC, NASA-STD-8739.4). Lead times for custom configurations range 8-16 weeks. Bulk purchases (50+ units) may qualify for 15-30% discounts. For prototyping, consider suppliers offering modular kits with interchangeable inserts. Always request certified leak test reports with delivery.
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