D38999/20WB4PN | 4-Pin Series III Square Flange Receptacle (Size 11)
The D38999/20WB4PN is a size 11 MIL-DTL-38999 Series III receptacle featuring 4 large pin contacts. Optimized with “W” olive drab cadmium finish and “N” polarization for power grids.
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D38999/20WB4PN Enhanced Power Transmission with 11-04 Layout
The D38999/20WB4PN is engineered for specialized electronic grids that require a higher current-carrying capacity than standard high-density signal connectors can provide. Utilizing a size 11 aluminum alloy shell, this receptacle facilitates four independent conductive channels through its 11-04 insert arrangement. These channels feature Size 20 pin contacts, which are larger and more robust than the common Size 22D variants. This increased contact surface area allows for more efficient power distribution and reduced thermal buildup, making the D38999/20WB4PN an ideal choice for localized power supply modules and motor control interfaces in ruggedized aerospace systems.
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 D38999/20WB4PN involves an olive drab cadmium plating applied over an electroless nickel underplate, providing a dual-layer defense against atmospheric degradation. This finish is renowned for its 500-hour salt spray rating, ensuring the receptacle remains operational in maritime or high-humidity environments. Beyond corrosion resistance, the cadmium layer is highly conductive, allowing the shell to act as a seamless extension of the equipment’s ground plane. This conductivity is vital for maintaining high-performance EMI and RFI shielding, protecting the four internal power or signal lines from external electromagnetic noise in dense electronic clusters.
Universal Polarization and Integration Stability
The D38999/20WB4PN utilizes the standard “N” (Normal) polarization keyway, providing universal intermateability with any standard Series III plug of the same size and arrangement. This standardized indexing logic eliminates the risk of mating confusion during global supply chain procurement and field maintenance. The Type 20 square flange design enables a permanent and secure four-point mounting on equipment panels, ensuring that the interface remains perfectly aligned even under high mechanical load. This stability is essential for maintaining the integrity of the power grid connection, preventing contact fretting or intermittent signal loss during high-torque mating operations.
Triple-Start Threaded Locking for Vibration Resistance
As a Series III interconnect, the D38999/20WB4PN features a triple-start threaded coupling mechanism that is inherently self-locking. This mechanical design is specifically intended for environments subject to high-frequency vibration and severe mechanical shock, such as those found near aircraft engines or on tactical ground vehicles. The quick-coupling threads ensure a full and secure mate with only one full turn of the coupling nut, while the internal locking mechanism prevents the connector from backing off over time. This ensures that the 4-pin interface maintains constant pressure and continuity, regardless of the physical stressors present in the operational theater.
Mechanical Protection and Field Maintenance
The structural reliability of the D38999/20WB4PN is further supported by its 100% scoop-proof shell design. This architectural feature ensures that the four pin contacts are recessed deeply enough to be protected from damage if the mating plug is accidentally tilted or “scooped” during the connection process. For long-term field support, the receptacle utilizes a rear-release crimp contact system. This allows maintenance technicians to replace or re-terminate individual pins using standard military tools without requiring the complete disassembly of the panel-mounted unit. This combination of physical protection and serviceability ensures a long operational life and a low total cost of ownership for mission-critical grids.
FAQ
How many contacts are in the D38999/20WB4PN?
How many contacts are in the D38999/20WB4PN?
The 11-04 layout features four Size 20 pin contacts, providing a robust interface for medium-current power or signal distribution.
What is the main benefit of the Size 20 contacts?
What is the main benefit of the Size 20 contacts?
Compared to smaller Size 22D pins, Size 20 contacts can handle higher electrical currents and offer greater physical durability for power-intensive applications.
Does the Olive Drab Cadmium (W) finish provide grounding?
Does the Olive Drab Cadmium (W) finish provide grounding?
Yes, the “W” finish is highly conductive, which facilitates effective EMI shielding and provides a reliable low-impedance ground path through the connector shell.
Is the D38999/20WB4PN compatible with standard Series III plugs?
Is the D38999/20WB4PN compatible with standard Series III plugs?
Absolutely. As long as the mating plug is size 11, has the 04 layout, and uses “N” polarization, it will be fully intermateable with this receptacle.
Can this connector be used in unpressurized aerospace compartments?
Can this connector be used in unpressurized aerospace compartments?
Yes, the internal fluorosilicone seals and rugged aluminum construction are designed to maintain environmental integrity during the rapid pressure and temperature changes typical of high-altitude flight.
Certification
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