D38999/20WG16PN | 16-Pin Series III Square Flange Receptacle (Size 21)
The D38999/20WG16PN is a size 21 MIL-DTL-38999 Series III receptacle with 16 large pin contacts. Features “W” olive drab cadmium finish and “N” polarization for heavy-duty grids.
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D38999/20WG16PN Balanced Power and Signal Distribution in Size 21 Shells
The D38999/20WG16PN is a high-performance interconnect solution designed for specialized electronic grids that require a versatile bridge for both complex signals and moderate power loads. Utilizing the large size 21 aluminum alloy shell, this receptacle facilitates sixteen independent conductive channels through its 21-16 insert arrangement. These Size 16 pin contacts are significantly more robust than standard signal-level pins, providing a higher current-carrying capacity and a larger surface area for more secure electrical contact. This makes the D38999/20WG16PN an ideal choice for multi-function subsystems where reliability must be maintained across varying electrical requirements.
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 Shell Conductivity
The “W” class finish of the D38999/20WG16PN represents a high-strength aluminum housing treated with olive drab cadmium over an electroless nickel underplate. This multi-layered coating is the benchmark for aggressive field environments, providing a certified 500-hour salt spray rating. Beyond its superior corrosion resistance, the cadmium finish is highly conductive, allowing the shell to act as a critical extension of the equipment ground. This ensures high-performance EMI and RFI shielding for the sixteen internal lines, protecting them from electromagnetic interference in dense electronic clusters and unpressurized aerospace compartments.
Universal N-Keying and Systematic Error-Proofing
The D38999/20WG16PN utilizes the standard “N” (Normal) polarization keyway, which is the most widely adopted indexing configuration in 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 defense supply chains and aerospace maintenance programs. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to decoupling under severe harmonic vibration. This standardized indexing logic ensures that the D38999/20WG16PN delivers a familiar and reliable mating experience for technicians during rapid field maintenance and assembly.
Precision Contact Fidelity and 21-16 Layout Integrity
Within its size 21 housing, the D38999/20WG16PN employs the 21-16 layout, providing sixteen channels using precision-machined Size 16 pin contacts. These contacts are finished with high-grade gold plating to maintain a low-resistance electrical path throughout the equipment’s operational life. The gold plating protects the contact interface from atmospheric oxidation and environmental degradation, even after hundreds of mating cycles. Despite the robust size of the sixteen pins, the high-performance dielectric insert provides exceptional insulation resistance, ensuring signal purity and preventing electrical leakage between channels in high-voltage or high-humidity operational zones.
Structural Stability and Heavy-Duty Mounting
The mechanical reliability of the D38999/20WG16PN is supported by its Type 20 square flange design, which allows for a secure and permanent four-point mounting on heavy-duty equipment panels. This stable mounting interface is essential for supporting the mechanical tension and physical weight of larger gauge wire harnesses associated with Size 16 contacts. Furthermore, the 100% scoop-proof shell architecture ensures that the sixteen pin contacts are recessed deeply enough within the housing to prevent any damage if the mating plug is misaligned during the connection process. This combination of structural rigidity and electrical precision makes the D38999/20WG16PN a durable solution for the most demanding electronic grids.
FAQ
How many contacts are provided in the D38999/20WG16PN?
How many contacts are provided in the D38999/20WG16PN?
The 21-16 layout provides sixteen individual conductive channels using Size 16 pin contacts, offering a perfect balance between power and signal density.
What are the advantages of Size 16 contacts?
What are the advantages of Size 16 contacts?
Size 16 contacts are larger than signal pins (like Size 22D), allowing them to carry more current and providing greater mechanical strength for heavy-duty wiring.
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.
Is the "N" keying compatible with standard Series III plugs?
Is the "N" keying compatible with standard Series III plugs?
Absolutely. As long as the mating plug is size 21, has the 16 layout, and uses standard “N” polarization, it will be fully intermateable with this receptacle.
Can this connector handle high-vibration aerospace use?
Can this connector handle high-vibration aerospace use?
Yes, the self-locking triple-start threads and robust square flange mount are specifically engineered to maintain electrical and mechanical integrity under extreme vibration and shock.
Certification
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