D38999/20WA35PLB | Size 9 Series III PCB Receptacle (Polarization B)
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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D38999/20WA35PLB Micro-Form Factor and Surface Mount Efficiency
The D38999/20WA35PLB is a high-performance interconnect designed specifically for specialized electronic grids that operate within extremely constrained spaces. As a size 9 shell, it offers the most compact footprint available in the Series III circular connector family, making it an essential component for tactical handheld units and micro-UAV control modules. The integration of fixed PCB tail contacts allows the receptacle to be soldered directly onto a rigid or flexible printed circuit board. This architecture eliminates the need for internal jumper wires, which not only streamlines the manufacturing process but also significantly enhances signal integrity by reducing the number of connection interfaces between the external sensor 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 | B | threaded coupling |
Olive Drab Cadmium Finish and Tactical Utility
The “W” designation of the D38999/20WA35PLB indicates a high-strength aluminum alloy shell finished with olive drab cadmium over an electroless nickel underplate. This finish is the gold standard for tactical military environments, providing exceptional protection against salt spray and atmospheric corrosion for up to 500 hours. Beyond its protective qualities, the matte green surface is non-reflective, a critical requirement for stealth operations and field gear. Furthermore, the cadmium plating ensures excellent electrical conductivity for shell-to-shell grounding, which is vital for maintaining effective EMI and RFI shielding in sensitive radio frequency and telemetry grids.
Specialized B-Keying and Mechanical Error-Proofing
A defining feature of the D38999/20WA35PLB is the “B” polarization keyway, which provides a physical safeguard against installation errors. In complex electronic systems where multiple size 9 connectors may be mounted on the same panel to handle different data or power functions, the “B” keying ensures that only a plug with a matching “B” key can be fully engaged. This mechanical lockout prevents the catastrophic risk of cross-mating, which could otherwise lead to short circuits or signal corruption. This standardized indexing system provides technicians with an intuitive, tactile confirmation of a correct connection, ensuring system safety during rapid field deployments or maintenance.
High-Density 09-35 Insert and Signal Fidelity
Within its miniaturized housing, the D38999/20WA35PLB utilizes the 09-35 high-density insert arrangement, facilitating six independent conductive paths. These Size 22D pin contacts are precision-machined and gold-plated to ensure a high-reliability electrical path with minimal contact resistance. Despite the dense proximity of the pins, the specialized dielectric material provides superior insulation resistance, maintaining signal purity even in the presence of moisture or high electromagnetic activity. The use of PC tails in this size 9 configuration offers a stable, vibration-resistant connection to the motherboard, ensuring that data transmission remains uninterrupted in high-shock industrial and aerospace environments.
Square Flange Mounting and Mechanical Durability
The D38999/20WA35PLB employs the Type 20 square flange design, which provides a permanent and secure four-point mounting interface for equipment panels. This stable mounting ensures that the mechanical forces generated during the mating of the triple-start threaded coupling are absorbed by the chassis rather than the delicate PCB solder joints. The Series III coupling mechanism is inherently self-locking, providing extreme resistance to loosening under harmonic vibration. Additionally, the 100% scoop-proof architecture protects the six PCB pins from damage if the mating plug is misaligned, ensuring that the D38999/20WA35PLB remains a durable and long-lasting interconnect solution for ruggedized digital grids.
FAQ
What are the benefits of the PCB tails in the D38999/20WA35PLB?
What are the benefits of the PCB tails in the D38999/20WA35PLB?
They allow for a direct solder connection to the printed circuit board, saving internal volume, reducing system weight, and providing a more robust electrical path in miniaturized devices.
Why is the "B" keying important for this size 9 connector?
Why is the "B" keying important for this size 9 connector?
The “B” keying is an alternate polarization that prevents cross-mating with nearby connectors of the same size, acting as a physical safeguard for complex electronic panels.
How many pins are in the 09-35 arrangement?
How many pins are in the 09-35 arrangement?
The 09-35 layout features six Size 22D pin contacts, providing a high density of signal channels for the smallest available shell size in the Series III family.
Does the Olive Drab Cadmium finish provide EMI shielding?
Does the Olive Drab Cadmium finish provide EMI shielding?
Yes, the “W” finish is highly conductive, ensuring a low-impedance ground path between the shell and the equipment chassis for superior electromagnetic interference suppression.
Can the D38999/20WA35PLB handle high-vibration aerospace use?
Can the D38999/20WA35PLB handle high-vibration aerospace use?
Absolutely. The self-locking triple-start threads and the four-point square flange mount are specifically engineered to maintain electrical integrity under the extreme vibration levels of modern aerospace platforms.
Certification
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