D38999/20WE26SCN | 26-Pin Series III Square Flange Receptacle (Size 17)
The D38999/20WE26SCN is a size 17 MIL-DTL-38999 Series III receptacle with 26 socket contacts. Features “W” olive drab cadmium finish and “N” polarization for tactical electronic grids.
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D38999/20WE26SCN Advanced Signal Density for Intermediate Electronic Grids
The D38999/20WE26SCN is a precision-engineered interconnect solution designed for specialized electronic grids where a high volume of data transmission must be managed within a constrained physical envelope. Utilizing the size 17 aluminum alloy shell, this receptacle facilitates twenty-six independent conductive channels through its 17-26 insert arrangement. These Size 20 socket contacts are precision-machined to ensure a reliable electrical interface with their mating pins. This configuration allows system designers to consolidate multiple signal streams—such as telemetry, control data, and sensor feedback—into a single mid-sized interface, making it a primary choice for modern avionics suites and centralized mission computers.
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 Resilience and Conductivity
The “W” class finish of the D38999/20WE26SCN 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 twenty-six internal signal lines from electromagnetic interference in dense electronic clusters.
Universal N-Keying and Global System Compatibility
The D38999/20WE26SCN utilizes the standard “N” (Normal) polarization keyway, which is the industry-default indexing configuration for Series III connectors. This ensures maximum intermateability with any standard-issue Series III plug of the same shell size and layout, facilitating easy integration into global aerospace and defense supply chains. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to loosening under severe harmonic vibration. This standardized indexing logic ensures that the D38999/20WE26SCN delivers a familiar and reliable mating experience for technicians during rapid field maintenance and initial assembly cycles.
Mechanical Stability and Square Flange Mounting
As a Type 20 wall-mount receptacle, the D38999/20WE26SCN features a robust square flange housing designed for permanent four-point mounting on equipment panels or bulkheads. This stable mounting interface is critical for supporting the mechanical tension and weight of a 26-wire cable harness, ensuring the interface remains perpendicular to the panel during mating. The Series III coupling design provides quick and secure engagement with only one full turn of the coupling nut. This structural rigidity ensures that electrical continuity is never compromised, even in high-stress environments such as tactical ground vehicles or unpressurized aerospace compartments where mechanical fatigue is a persistent threat.
Socket Contact Integrity and Field Serviceability
The structural reliability of the D38999/20WE26SCN is further enhanced by its use of Size 20 socket contacts within a 100% scoop-proof shell design. The socket design provides a secure female interface that protects the internal electrical connection from external contamination and mechanical shock. For long-term field support, the receptacle utilizes a rear-release crimp contact system, allowing maintenance personnel to install or replace individual sockets using standard military-grade tools without requiring a complete teardown of the panel-mounted unit. This combination of physical protection and serviceability ensures the D38999/20WE26SCN remains a durable and long-lasting interconnect solution for mission-critical grids.
FAQ
How many contacts are provided in the D38999/20WE26SCN?
How many contacts are provided in the D38999/20WE26SCN?
The 17-26 layout provides twenty-six individual conductive channels using Size 20 socket contacts, offering high signal density for a size 17 shell.
What is the benefit of the socket (S) contact type?
What is the benefit of the socket (S) contact type?
Socket contacts are the female portion of the connection, designed to accept pin contacts. They are generally more protected within the insulator, reducing the risk of accidental shorting.
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 "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 17, 26-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 engineered to maintain electrical integrity under the extreme vibration levels of modern tactical platforms.
Certification
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