D38999/20WC35PN | 22-Pin Series III Square Flange Receptacle (Size 13)
The D38999/20WC35PN is a size 13 MIL-DTL-38999 Series III receptacle with 22 pin contacts. Features “W” olive drab cadmium finish and “N” polarization for tactical electronic grids.
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D38999/20WC35PN Optimized Signal Integration for Mid-Sized Grids
The D38999/20WC35PN is a precision-engineered interconnect solution designed for specialized electronic grids where a balance between a compact footprint and high signal count is required. Utilizing the size 13 shell, this receptacle facilitates twenty-two independent conductive channels through its 13-35 insert arrangement. These Size 22D pin contacts are precision-machined and gold-plated to ensure minimal contact resistance and maximum longevity. This configuration allows system designers to manage complex data streams and control signals within a mid-sized form factor, making it a primary choice for modern avionics suites and localized sensor hubs where space must be used efficiently without sacrificing data throughput.
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 | N | threaded coupling |
Tactical Environmental Shielding and Conductivity
The “W” class finish of the D38999/20WC35PN features a high-strength aluminum alloy shell treated with olive drab cadmium plating over an electroless nickel underplate. This multi-layered defense system is specifically designed for aggressive field environments, offering an exceptional 500-hour salt spray rating. Beyond its superior corrosion resistance, the cadmium layer is highly conductive, allowing the shell to provide a seamless electrical path for grounding. This conductivity is vital for maintaining effective EMI and RFI shielding, protecting the twenty-two internal signal lines from external electromagnetic interference in dense electronic clusters.
Universal N-Keying and Global System Compatibility
The D38999/20WC35PN utilizes the standard “N” (Normal) polarization keyway, which is the most widely adopted indexing configuration within the Series III framework. This ensures maximum intermateability with any standard-issue Series III plug of the same shell size and layout, facilitating easy integration into global aerospace and defense supply chains. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to loosening under severe harmonic vibration. This standardized indexing logic ensures that the D38999/20WC35PN delivers a familiar and reliable mating experience for technicians during rapid field maintenance and initial assembly cycles.
Mechanical Stability and Square Flange Mounting
As a Type 20 wall-mount receptacle, the D38999/20WC35PN features a robust square flange housing designed for permanent four-point mounting on equipment panels or bulkheads. This stable mounting interface is critical for supporting the mechanical tension and weight of a 22-wire cable harness, ensuring the interface remains perpendicular to the panel during mating. The Series III coupling design provides quick and secure engagement with only one full turn of the coupling nut. This structural rigidity ensures that electrical continuity is never compromised, even in high-stress environments such as tactical ground vehicles or unpressurized aerospace compartments where mechanical fatigue is a persistent threat.
Scoop-Proof Protection and Service Reliability
The structural integrity of the D38999/20WC35PN is further reinforced by its 100% scoop-proof shell design. This feature ensures that the twenty-two pin contacts are recessed deeply enough within the housing to prevent any bending or damage if the mating plug is misaligned during the connection process. For long-term field support, the receptacle utilizes a rear-release crimp contact system, allowing maintenance personnel to install or replace individual pins using standard military-grade tools without requiring a complete teardown of the panel-mounted unit. This combination of physical protection and serviceability ensures the D38999/20WC35PN remains a durable and long-lasting interconnect solution for mission-critical grids.
FAQ
How many contacts are provided in the D38999/20WC35PN?
How many contacts are provided in the D38999/20WC35PN?
The 13-35 layout provides twenty-two individual signal channels using high-density Size 22D pin contacts, offering excellent signal concentration for a size 13 shell.
What is the main benefit of the Olive Drab Cadmium (W) finish?
What is the main benefit of the Olive Drab Cadmium (W) finish?
It provides the industry-standard for corrosion resistance (500-hour salt spray) and high shell-to-shell conductivity for superior EMI and RFI shielding performance.
Can the D38999/20WC35PN mate with any Series III plug?
Can the D38999/20WC35PN mate with any Series III plug?
It will mate with any MIL-DTL-38999 Series III plug that has a size 13 shell, the 35 layout, and standard “N” polarization, regardless of the manufacturer.
Is the square flange mount air-tight?
Is the square flange mount air-tight?
While the connector has internal seals, achieving an air-tight panel mount usually requires an additional flange gasket and proper fastener tensioning on the square flange.
What does the "N" represent in the part number?
What does the "N" represent in the part number?
The “N” stands for Normal polarization, which is the default keying configuration used to prevent cross-mating when only one type of size 13 connector is present on a panel.
Certification
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