D38999/24WB4PCN | 4-Pin Series III Jam Nut PCB Receptacle (Size 11)
The D38999/24WB4PCN is a size 11 MIL-DTL-38999 Series III jam nut receptacle with 4 pin PCB contacts. Features “W” olive drab cadmium finish and “N” polarization for power grids.
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D38999/24WB4PCN Streamlined Single-Hole Mounting and Board-Level Efficiency
The D38999/24WB4PCN is a specialized interconnect solution designed for advanced electronic grids where panel space and assembly speed are critical. Utilizing the Type 24 jam nut mounting style, this receptacle requires only a single D-shaped hole in the equipment bulkhead, significantly reducing the machining time and potential leak points compared to four-hole square flange models. The integration of fixed PC tail contacts allows the connector to be soldered directly to a printed circuit board (PCB), eliminating the weight and volume of internal wiring. This direct-to-board architecture is ideal for compact power supply modules and localized motor controllers where internal space is at a significant premium.
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 Surface Conductivity
The “W” class finish of the D38999/24WB4PCN indicates a high-strength aluminum alloy shell treated with olive drab cadmium plating over an electroless nickel underplate. This multi-layered defense system is specifically engineered for the most aggressive field environments, providing a certified 500-hour salt spray rating. Beyond its superior corrosion resistance, the cadmium finish is highly conductive, ensuring an excellent low-impedance ground path between the shell and the equipment chassis. This conductivity is essential for maintaining effective EMI and RFI shielding, which protects the four internal power lines from electromagnetic interference in dense electronic clusters.
Universal N-Keying and Reliable System Integration
The D38999/24WB4PCN utilizes the standard “N” (Normal) polarization keyway, providing universal intermateability with any standard-issue Series III plug of the same size and arrangement. For engineers designing global hardware platforms, the “N” indexing offers a predictable and reliable mating experience, facilitating easier procurement and maintenance across international supply chains. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to loosening under severe harmonic vibration. This ensures that the 4-pin power interface remains securely engaged, providing constant electrical continuity even in high-stress aerospace and ground-vehicle environments.
Enhanced Power Distribution with 11-04 Layout
Within the size 11 housing, the D38999/24WB4PCN employs the 11-04 insert arrangement, providing four independent conductive channels using Size 20 pin contacts. These PC tail contacts are precision-machined and finished with high-grade gold plating to ensure a low-resistance interface. Compared to high-density signal pins, the Size 20 contacts offer a larger surface area and higher current-carrying capacity, making them suitable for delivering localized power to PCB-mounted components. The high-performance dielectric insert ensures superior insulation resistance, preventing electrical leakage between channels even in unpressurized aerospace compartments subject to rapid temperature fluctuations.
Mechanical Stability and Protection of Solder Joints
The structural reliability of the D38999/24WB4PCN is enhanced by its jam nut design, which provides a high-torque mechanical connection to the panel. This stability is critical for preventing the transfer of mating forces to the delicate PCB solder joints, ensuring long-term electrical integrity. Furthermore, the 100% scoop-proof shell architecture ensures that the four delicate PCB pins are recessed deeply enough within the housing to prevent any bending or damage if the mating plug is misaligned during the connection process. This combination of mechanical robustness and board-level precision makes the D38999/24WB4PCN a future-proof interconnect solution for ruggedized digital power grids.
FAQ
What are the benefits of the jam nut (Type 24) mount?
What are the benefits of the jam nut (Type 24) mount?
Jam nut mounting requires only a single hole in the panel, which simplifies machining and allows for a more compact connector placement on crowded equipment bulkheads.
How many contacts does the D38999/24WB4PCN provide?
How many contacts does the D38999/24WB4PCN provide?
The 11-04 layout provides four independent conductive channels using robust Size 20 pin contacts, optimized for medium-current power distribution.
Can I solder this connector directly to a circuit board?
Can I solder this connector directly to a circuit board?
Yes, the “C” in the part number indicates PC tail contacts, which are designed for direct through-hole soldering on a PCB, eliminating internal wiring.
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, facilitating a reliable low-impedance ground path between the shell and the chassis for superior electromagnetic interference suppression.
Is the D38999/24WB4PCN vibration resistant?
Is the D38999/24WB4PCN vibration resistant?
Absolutely. The self-locking triple-start threads and the secure jam nut mounting are specifically engineered to maintain electrical and mechanical integrity under extreme vibration levels.
Certification
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