D38999/20WB35PLA | 13-Pin Series III PCB Receptacle (Key A)
The D38999/20WB35PLA is a size 11 MIL-DTL-38999 Series III receptacle with 13 pin PCB contacts. Features “W” olive drab cadmium finish and “A” polarization for high-density grids.
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D38999/20WB35PLA Spatial Optimization and Board-Level Integration
The D38999/20WB35PLA is a precision interconnect solution designed for specialized electronic grids where internal volume and weight reduction are critical design factors. Utilizing a size 11 aluminum alloy shell, this receptacle facilitates thirteen independent signal channels within a remarkably compact footprint. The integration of fixed PC tail contacts allows the connector to be soldered directly onto a printed circuit board (PCB), completely eliminating the need for internal wire harnesses and manual crimp operations. This direct-to-board architecture not only simplifies the assembly process but also significantly improves signal path reliability by reducing the number of physical transition points between the external sensor array 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 |
Tactical Environmental Shielding and "W" Class Finish
The “W” finish of the D38999/20WB35PLA represents a high-strength aluminum housing treated with olive drab cadmium over an electroless nickel underplate. This multi-layered coating is the industry standard for aggressive field environments, providing an exceptional 500-hour salt spray rating. Beyond its superior corrosion resistance, the cadmium layer is highly conductive, allowing the shell to act as an effective extension of the system ground. This ensures high-performance EMI and RFI shielding for the thirteen sensitive signal lines, protecting internal data from electromagnetic noise. The non-reflective matte green surface further ensures the connector meets the stealth and aesthetic requirements of modern tactical equipment.
Specialized Polarization A for Redundant System Safety
The “A” designation in the D38999/20WB35PLA part number indicates an alternate polarization keyway, providing a vital physical safeguard for complex electronic architectures. In mission-critical grids where multiple size 11 connectors are co-located on a single panel to handle different subsystems, the “A” keying ensures that only a matching “A” key plug can be fully engaged. This mechanical lockout prevents the catastrophic risk of cross-mating, which could otherwise lead to signal corruption or electrical damage to the internal PCB components. This standardized indexing logic provides technicians with a clear, tactile confirmation of a correct connection during rapid maintenance cycles or field assembly.
High-Density 11-35 Layout and Contact Fidelity
Within the size 11 housing, the D38999/20WB35PLA utilizes the 11-35 high-density insert arrangement, offering thirteen signal channels using Size 22D pin contacts. These PC tail contacts are precision-machined from copper alloy and finished with high-grade gold plating to maintain a low-resistance interface. The gold plating ensures that the contact surfaces remain protected against atmospheric oxidation and sulfurization throughout the equipment’s service life. Despite the close proximity of the pins, the high-performance dielectric insert provides superior insulation resistance, ensuring signal purity and preventing crosstalk even in unpressurized aerospace compartments or high-humidity industrial zones.
Structural Stability and Mechanical Durability
The structural integrity of the D38999/20WB35PLA is reinforced by its Type 20 square flange design, which facilitates a permanent and secure four-point mounting interface on the equipment chassis. This stable mounting ensures that the mechanical stress generated during the mating of the triple-start threaded coupling is absorbed by the metal housing rather than the internal PCB solder joints. Furthermore, the 100% scoop-proof shell architecture ensures that the thirteen delicate PCB pins are recessed deeply enough to prevent any damage if the mating plug is misaligned during connection. This combination of mechanical robustness and board-level precision makes the D38999/20WB35PLA a future-proof interconnect solution for ruggedized digital grids.
FAQ
What are the benefits of the PCB tails in the D38999/20WB35PLA?
What are the benefits of the PCB tails in the D38999/20WB35PLA?
Fixed PC tails allow for a direct solder connection to the circuit board, which saves internal volume, reduces system weight, and provides a more stable signal path for high-density electronic modules.
Why is the "A" keying used in this size 11 model?
Why is the "A" keying used in this size 11 model?
The “A” keying is an alternate polarization that provides a mechanical lockout to prevent cross-mating with nearby connectors of the same size, enhancing safety in complex multi-connector panels.
How many pins are provided in the 11-35 layout?
How many pins are provided in the 11-35 layout?
The 11-35 arrangement provides thirteen independent signal channels using Size 22D pin contacts, offering excellent density for a compact size 11 shell.
Does the Olive Drab Cadmium finish help with grounding?
Does the Olive Drab Cadmium finish help with grounding?
Yes, the “W” finish is highly conductive, ensuring a reliable low-impedance ground path between the shell and the chassis for superior EMI and RFI suppression.
Can this connector handle high-vibration aerospace use?
Can this connector 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 and tactical platforms.
Certification
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