D38999/24WB4SCN | 4-Socket Series III Jam Nut PCB Receptacle (Size 11)
The D38999/24WB4SCN is a size 11 MIL-DTL-38999 Series III jam nut receptacle with 4 socket PCB contacts. Features “W” olive drab cadmium finish and “N” polarization for power grids.
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D38999/24WB4SCN Efficiency of Jam Nut Mounting for PCB-Integrated Grids
The D38999/24WB4SCN is a precision-engineered interconnect solution designed for specialized electronic grids where minimizing panel footprint and maximizing assembly speed are top priorities. Utilizing the Type 24 jam nut mounting style, this receptacle requires only a single D-shaped hole in the equipment bulkhead, which simplifies the machining process and reduces potential ingress points for moisture compared to traditional four-hole flanges. The integration of fixed PC tail socket contacts allows the connector to be soldered directly to a printed circuit board (PCB), creating a low-profile, high-integrity connection that eliminates the need for internal wiring harnesses. This streamlined architecture is ideal for compact power distribution units and localized control modules.
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 D38999/24WB4SCN represents a high-strength aluminum alloy shell treated with olive drab cadmium 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, protecting the four internal conductive paths from electromagnetic interference in dense electronic clusters and unpressurized aerospace compartments.
Universal N-Keying and Secure System Intermateability
The D38999/24WB4SCN 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 interface remains securely engaged, providing constant electrical continuity even in high-stress aerospace and ground-vehicle environments.
Optimized Power and Socket Contact Fidelity
Within the size 11 housing, the D38999/24WB4SCN employs the 11-04 insert arrangement, providing four independent conductive channels using Size 20 socket contacts. These PC tail sockets are precision-machined from copper alloy and finished with high-grade gold plating to maintain a low-resistance interface. The socket design provides a secure female interface that protects the internal electrical connection from external contamination and mechanical shock. The high-performance dielectric insert ensures superior insulation resistance, preventing electrical leakage between channels even in unpressurized aerospace compartments subject to rapid temperature fluctuations and high humidity.
Structural Stability and Protection of Solder Joints
The structural reliability of the D38999/24WB4SCN 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 and preventing contact fatigue. Furthermore, the 100% scoop-proof shell architecture ensures that the four delicate PCB sockets are recessed deeply enough within the housing to prevent any damage if the mating plug is misaligned during the connection process. This combination of mechanical robustness and board-level precision makes the D38999/24WB4SCN a future-proof interconnect solution for ruggedized digital grids.
FAQ
What are the benefits of the jam nut (Type 24) mounting style?
What are the benefits of the jam nut (Type 24) mounting style?
Jam nut mounting simplifies panel preparation by requiring only a single hole, and it provides a secure, high-torque attachment that is ideal for compact and weight-sensitive equipment.
How many sockets are provided in the 11-04 layout?
How many sockets are provided in the 11-04 layout?
The 11-04 layout provides four independent conductive channels using robust Size 20 socket contacts, offering a reliable interface for medium-current power or signal transmission.
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 specifically designed for direct through-hole soldering on a PCB, eliminating the need for internal wire management.
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 D38999/24WB4SCN vibration resistant?
Is the D38999/24WB4SCN 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 and shock conditions.
Certification
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