D38999/20WA35PLA | Size 9 Series III PCB Receptacle (Olive Drab Cadmium)
The D38999/20WA35PLA is a compact MIL-DTL-38999 Series III receptacle with 6 pin PCB contacts. Features a size 9 shell, “W” cadmium finish, and “A” polarization for rugged grids.
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D38999/20WA35PLA Compact Footprint and Board-Level Integration
The D38999/20WA35PLA is a specialized interconnect solution designed for high-density electronic grids where spatial optimization is a primary requirement. As a size 9 shell, it represents the smallest form factor in the Series III family, making it ideal for compact handheld devices and miniaturized avionics modules. The integration of fixed PC tail contacts allows this receptacle to be mounted directly onto a printed circuit board, removing the need for internal wire termination. This direct-to-board architecture not only saves significant internal volume but also enhances signal integrity by minimizing the number of conductive junctions between the external cable and the internal processor.
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 |
Olive Drab Cadmium Finish and Corrosion Resistance
The “W” class designation of the D38999/20WA35PLA indicates a robust aluminum alloy shell finished with olive drab cadmium plating over an electroless nickel underplate. This specific finish is highly valued in tactical environments for its exceptional corrosion resistance, capable of withstanding 500 hours of continuous salt spray. The cadmium coating also provides a non-reflective, matte surface that is essential for military-grade equipment used in low-visibility operations. Furthermore, the finish ensures excellent electrical conductivity for shell-to-shell grounding, which is critical for suppressing electromagnetic interference in sensitive communication grids.
Specialized Polarization A for System Security
To ensure reliable operation in complex equipment racks, the D38999/20WA35PLA utilizes the “A” polarization keyway. This mechanical indexing feature acts as a physical safeguard, ensuring that only a matching “A” key plug can mate with the receptacle. In systems where multiple size 9 connectors are installed in close proximity, having an alternate keying position like “A” prevents the accidental cross-mating of different circuits. This error-proofing is vital for maintaining the safety of the electronic grid, protecting internal board-level components from potential damage caused by incorrect electrical routing during field maintenance or initial assembly.
High-Density 09-35 Layout and Contact Precision
Within its compact shell, the D38999/20WA35PLA employs the 09-35 high-density insert arrangement, providing six independent signal channels. These Size 22D pin contacts are precision-machined and finished with high-grade gold plating to maintain a low-resistance interface. Despite its small size, the dielectric insert provides high insulation resistance between the six conductive paths, ensuring clear signal transmission even in high-humidity or high-vibration environments. The use of PCB tails in this configuration provides a stable, vibration-resistant connection to the motherboard, making it a preferred choice for ruggedized telemetry and portable tactical gear.
Mechanical Durability and Square Flange Stability
The structural integrity of the D38999/20WA35PLA is reinforced by the Type 20 square flange housing, which allows for secure four-point mounting to the equipment panel. This stable interface ensures that the mechanical stress of the triple-start threaded coupling is transferred to the chassis rather than the PCB solder joints. The Series III coupling mechanism provides a self-locking connection that is inherently resistant to decoupling under severe shock. Additionally, the 100% scoop-proof shell design ensures that the six delicate PCB pins are recessed deeply enough to prevent any bending or damage if the mating plug is misaligned, ensuring long-term field reliability.
FAQ
Why use the D38999/20WA35PLA for PCB mounting?
Why use the D38999/20WA35PLA for PCB mounting?
The fixed PCB tail contacts allow for a direct solder connection to the board, which saves internal space, reduces assembly weight, and provides a more reliable signal path in compact devices.
What is the benefit of the Olive Drab Cadmium (W) finish?
What is the benefit of the Olive Drab Cadmium (W) finish?
It offers superior corrosion resistance (500-hour salt spray rating) and a non-reflective finish, making it the standard for tactical and maritime military environments.
How many pins are in the 09-35 layout?
How many pins are in the 09-35 layout?
The 09-35 arrangement provides six signal channels using Size 22D pin contacts, offering high density for a shell as small as size 9.
Is the "A" keying compatible with standard "N" plugs?
Is the "A" keying compatible with standard "N" plugs?
No, the “A” keying is a unique polarization that only mates with an “A” key plug, providing a mechanical lockout to prevent cross-mating with other nearby connectors.
Can this small connector withstand aerospace vibrations?
Can this small connector withstand aerospace vibrations?
Absolutely. The self-locking triple-start threads and the square flange mount are specifically designed to maintain mechanical and electrical integrity under the extreme vibration levels of aerospace platforms.
Certification
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