D38999/26WG35PN | 79-Pin Series III Aluminum Straight Plug (Size 21)
The D38999/26WG35PN is a size 21 MIL-DTL-38999 Series III aluminum plug with 79 pin contacts. Features “W” olive drab cadmium finish and “N” polarization for high-capacity grids.
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D38999/26WG35PN Massive Signal Consolidation in Large-Scale Electronic Grids
The D38999/26WG35PN is a high-performance interconnect solution engineered for specialized electronic grids that require the simultaneous transmission of a vast number of signal channels. Utilizing the size 21 aluminum alloy shell, this plug facilitates seventy-nine independent conductive paths through its 21-35 high-density insert arrangement. This layout is a critical asset for modern avionics integration and complex naval sensor suites, where high-speed data buses and multiple analog feeds must be routed through a single, robust interface. By housing seventy-nine Size 22D pin contacts in a size 21 envelope, the D38999/26WG35PN optimizes cable management and reduces the overall number of connection points required in mission-critical hardware.
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 |
Advanced EMI Shielding and Surface Conductivity
The “W” class finish of the D38999/26WG35PN consists of olive drab cadmium plating applied over an electroless nickel underplate, creating a multi-layered defense system. Beyond its 500-hour salt spray rating for corrosion resistance, this finish is highly conductive, which is essential for electromagnetic compatibility. The plug is equipped with an internal grounding spring ring that provides 360-degree shell-to-shell conductivity upon mating. This architecture ensures that the seventy-nine internal signal lines are effectively shielded from external RFI and EMI, maintaining signal integrity in environments saturated with high-frequency radio transmissions or near heavy electrical machinery.
Self-Locking Mechanical Integrity for High-Vibration Zones
As a Series III straight plug, the D38999/26WG35PN incorporates a triple-start threaded coupling mechanism with an integrated self-locking ratchet. This design allows for rapid and secure engagement with a single 360-degree turn of the coupling nut, providing both audible and tactile confirmation that the connection is fully seated. The internal anti-decoupling device prevents the connector from loosening even when subjected to the intense harmonic vibrations and mechanical shocks common in jet engine compartments or heavy combat vehicle operations. This mechanical stability is vital for ensuring uninterrupted electrical continuity across the seventy-nine-pin grid during critical flight or field maneuvers.
Precision Contact Fidelity and 21-35 Layout Stability
Within the size 21 housing, the D38999/26WG35PN employs seventy-nine Size 22D pin contacts, providing a high-fidelity interface for complex digital and analog signal sets. These pins are precision-machined from copper alloy and finished with high-grade gold plating to ensure low contact resistance and prevent oxidation throughout the equipment’s operational life. The high-performance dielectric insert provides exceptional insulation resistance between the seventy-nine channels, preventing electrical crosstalk and signal leakage even in unpressurized aerospace compartments subject to rapid fluctuations in temperature and humidity. This ensures a clean and reliable signal environment for advanced command and control systems.
100% Scoop-Proof Architecture and Field Serviceability
The structural reliability of the D38999/26WG35PN is reinforced by its 100% scoop-proof shell design. This feature ensures that the seventy-nine pin contacts are recessed deeply enough within the plug housing to prevent any bending or damage if the mating receptacle is misaligned during the connection process. For long-term logistical support, the plug utilizes a rear-release crimp contact system, allowing technicians to install or replace individual pins using standard military-specification tools without disassembling the entire unit. This combination of physical protection and modular maintainability ensures that the D38999/26WG35PN delivers a low total cost of ownership for mission-critical digital grids.
FAQ
How many contacts does the D38999/26WG35PN support?
How many contacts does the D38999/26WG35PN support?
The 21-35 layout provides seventy-nine independent conductive channels using high-density Size 22D pin contacts, offering one of the highest signal capacities for a size 21 shell.
What are the benefits of the triple-start threaded coupling?
What are the benefits of the triple-start threaded coupling?
The triple-start threads allow for rapid mating with a single turn and include an integrated self-locking ratchet that prevents the plug from loosening under high-vibration conditions.
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 and works in conjunction with the plug’s internal grounding fingers to provide 360-degree EMI/RFI protection for the internal signal grid.
Is the D38999/26WG35PN compatible with standard Series III receptacles?
Is the D38999/26WG35PN compatible with standard Series III receptacles?
Absolutely. As long as the mating receptacle is size 21, has the 35 layout, and uses standard “N” polarization, it will be fully intermateable with this plug.
Can this connector be used in maritime environments?
Can this connector be used in maritime environments?
Yes, the “W” finish is specifically designed to provide 500 hours of salt spray resistance, making it suitable for maritime, coastal, and high-humidity tactical applications.
Certification
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