D38999/20WJ24SN | 24-Pin Series III Square Flange Receptacle (Size 25)
The D38999/20WJ24SN is a size 25 MIL-DTL-38999 Series III receptacle featuring 24 robust socket contacts. Optimized with “W” olive drab cadmium finish and “N” polarization for high-capacity grids.
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D38999/20WJ24SN Structural Integrity and High-Capacity Grid Integration
The D38999/20WJ24SN is engineered for complex electronic grids that require a robust physical interface to manage substantial signal and power distribution. Utilizing the size 25 aluminum alloy shell, which is the largest standard housing in the Series III family, this receptacle facilitates twenty-four independent conductive channels through its 25-24 insert arrangement. The primary advantage of this large-format shell is the significant increase in mechanical durability and the ability to handle larger gauge wire bundles without compromising the structural integrity of the equipment bulkhead. This makes it an essential component for centralized mission controllers and heavy-duty power management systems where reliability under load is paramount.
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 D38999/20WJ24SN consists of an olive drab cadmium plating applied over an electroless nickel underplate, creating a high-performance barrier against aggressive atmospheric conditions. This finish is specifically certified for 500 hours of continuous salt spray exposure, ensuring the receptacle remains operational in maritime or high-humidity tactical zones. Beyond corrosion resistance, the cadmium layer provides excellent surface conductivity, ensuring the shell acts as an efficient extension of the system ground. This is vital for maintaining effective EMI and RFI shielding, protecting the twenty-four internal circuits from external electromagnetic noise in dense electronic clusters.
Universal N-Keying and Error-Proof Interconnectivity
The D38999/20WJ24SN 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 managing complex panels with multiple large-format connectors, the standardized indexing logic of the N-key ensures a predictable and reliable mating experience across different hardware platforms. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to decoupling under severe harmonic vibration. This ensures that the 24-pin interface remains securely engaged, providing constant electrical continuity even in high-stress aerospace and ground-vehicle environments.
Mixed-Signal Versatility and 25-24 Layout Precision
Within its size 25 housing, the D38999/20WJ24SN employs the 25-24 layout, which provides twelve Size 16 and twelve Size 12 conductive paths. This diverse arrangement allows engineers to combine high-amperage power delivery with precision signal data within a single, unified interface. Each Size 12 and Size 16 socket contact is precision-machined from copper alloy and finished with high-grade gold plating to maintain a low-resistance electrical path. Despite the robust size of the twenty-four pins, the high-performance dielectric insert provides exceptional insulation resistance, ensuring signal purity and preventing voltage leakage between channels in unpressurized aerospace compartments.
Mechanical Longevity and Enhanced Field Serviceability
The structural reliability of the D38999/20WJ24SN is further supported by its 100% scoop-proof shell architecture. This design ensures that the twenty-four socket contacts are recessed deeply enough within the housing to prevent any damage if the mating plug is misaligned or tilted during the connection process. For long-term field support, the receptacle utilizes a rear-release crimp contact system, allowing maintenance technicians to install or replace individual sockets using standard military tools without disassembling the entire panel mount. This combination of physical protection and modular serviceability ensures the D38999/20WJ24SN provides a low total cost of ownership for mission-critical electronic grids.
FAQ
How many contacts does the D38999/20WJ24SN provide?
How many contacts does the D38999/20WJ24SN provide?
The 25-24 layout provides twenty-four independent channels, consisting of twelve Size 16 and twelve Size 12 socket contacts for versatile signal and power use.
What is the benefit of the Size 12 contacts in this model?
What is the benefit of the Size 12 contacts in this model?
Size 12 contacts have a high current-carrying capacity, making them suitable for localized power distribution and motor control in heavy-duty electronic systems.
Does the Olive Drab Cadmium finish help with EMI shielding?
Does the Olive Drab Cadmium finish help with EMI shielding?
Yes, the “W” finish is highly conductive, ensuring a reliable low-impedance ground path between the shell and the chassis for superior electromagnetic interference suppression.
Is the "N" keying compatible with other Series III plugs?
Is the "N" keying compatible with other Series III plugs?
Yes, the “N” keying is the standard universal polarization for Series III, meaning it will mate with any size 25, 24-layout plug that also uses the standard “N” configuration.
Can this connector handle high-vibration aerospace use?
Can this connector handle high-vibration aerospace use?
Absolutely. The self-locking triple-start threads and the four-point square flange mount are specifically designed to maintain mechanical and electrical integrity under extreme vibration levels.
Certification
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