D38999/20FH35PCA | 100-Pin Series III PCB Receptacle (Polarization A)
The D38999/20FH35PCA is a size 23 MIL-DTL-38999 Series III receptacle featuring 100 pin PCB contacts. Optimized for high-density board-level integration with “A” keying and “F” finish.
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D38999/20FH35PCA Advanced Board-to-Cable Interconnect Logic
The D38999/20FH35PCA is engineered for massive electronic grids that require a direct, stable transition from complex external cabling to internal printed circuit boards. By utilizing fixed PC tail contacts, this model eliminates the need for intermediate wire harnesses and crimp terminations, which significantly reduces total system impedance and enclosure weight. The Type 20 square flange housing provides a permanent four-point mounting interface on the equipment chassis, effectively isolating the delicate solder joints on the PCB from the mechanical stresses of high-torque mating and unmating cycles. This architecture is essential for modern aerospace telemetry and ruggedized server modules where internal spatial efficiency is a critical design constraint.
Key Specifications
Shell Material | Voltage Rating | Current Rating | Operating Temp | Ingress Protection | Mating Cycles | Keying & Polarization | Coupling |
|---|---|---|---|---|---|---|---|
Aluminum alloy | ~1000 VAC | ~23 A | -65 °C to +200 °C | IP67 | 500 | A | threaded coupling |
Ultra-High Density 23-35 Layout Efficiency
Within the size 23 aluminum alloy shell, the D38999/20FH35PCA accommodates one hundred independent signal channels using the 23-35 insert arrangement. These Size 22D pin contacts are precision-machined and gold-plated to ensure maximum signal fidelity and protection against atmospheric corrosion. This level of density allows engineers to consolidate multiple smaller connectors into a single robust interface, simplifying the overall system architecture and reducing potential points of failure. The dielectric insert is designed to maintain high insulation resistance even in the presence of rapid thermal fluctuations, ensuring that the 100-pole interface remains reliable during high-bandwidth data transmission.
Polarization Keying A and Multi-Connector Safety
The “A” designation in the D38999/20FH35PCA part number specifies an alternate polarization keyway, providing a vital mechanical safeguard for dense electronic environments. In systems where multiple size 23 connectors are mounted in close proximity, the “A” keying ensures that only a matching “A” key plug can be fully engaged. This prevents accidental cross-mating between different functional systems—such as navigation sensors and power distribution units—which could lead to catastrophic electrical errors or hardware damage. This standardized indexing logic provides an intuitive physical safeguard, streamlining both the assembly process and field maintenance operations in mission-critical grids.
Electroless Nickel Plating and EMI Suppression
As an “F” class component, the D38999/20FH35PCA is finished with electroless nickel over its high-strength aluminum housing, offering superior conductivity and durability. This conductive plating is a core requirement for aerospace electronic grids, as it provides a low-impedance ground path to the chassis for effective EMI and RFI shielding. By acting as a reinforced Faraday cage, the shell protects the 100 sensitive internal signal paths from electromagnetic noise and interference. Furthermore, the connector features high-resilience fluorosilicone interfacial seals that maintain a moisture-proof and dust-proof barrier, ensuring performance in high-humidity zones and maritime salt spray environments.
Mechanical Security and Scoop-Proof Protection
Reliability under extreme mechanical stress is guaranteed by the D38999/20FH35PCA’s triple-start threaded coupling mechanism, which offers a self-locking connection resistant to high-frequency vibration. The shell is engineered with a 100% scoop-proof design, ensuring that the one hundred pin contacts are recessed deeply enough to prevent any damage if the mating plug is misaligned during the connection process. This mechanical robustness is particularly critical for blind-mating in restricted-access enclosures. By combining the precision of PCB mounting with the structural security of the Series III interface, the D38999/20FH35PCA delivers a future-proof interconnect solution for the most demanding global industrial and defense applications.
FAQ
What makes the D38999/20FH35PCA suitable for direct board mounting?
What makes the D38999/20FH35PCA suitable for direct board mounting?
The fixed PC tail (PCB) contacts allow the connector to be soldered directly onto a circuit board, which saves space, reduces weight, and provides a highly reliable electrical path compared to wired alternatives.
Why is the "A" keying used in this 100-pin model?
Why is the "A" keying used in this 100-pin model?
Keying “A” provides a unique mechanical alignment that prevents this receptacle from mating with standard “N” or other alternate key plugs, ensuring safety on panels with multiple similar connectors.
How many signal channels does the 23-35 layout provide?
How many signal channels does the 23-35 layout provide?
This arrangement provides one hundred Size 22D signal channels, making it one of the highest density configurations available in the MIL-DTL-38999 Series III framework.
Does the electroless nickel (F) finish help with signal purity?
Does the electroless nickel (F) finish help with signal purity?
Yes, the “F” finish is highly conductive, providing the necessary grounding and electromagnetic interference (EMI) shielding to prevent external noise from degrading the internal data signals.
Can the D38999/20FH35PCA handle rapid pressure changes at high altitudes?
Can the D38999/20FH35PCA handle rapid pressure changes at high altitudes?
Absolutely. The integrated fluorosilicone seals and rugged square flange mount are specifically designed to maintain an environmental barrier during the rapid pressure and temperature cycles typical of aerospace flight.
Certification
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