D38999/26FD35SA | 37-Socket Series III Electroless Nickel Plug (Size 15, Key A)
The D38999/26FD35SA is a size 15 MIL-DTL-38999 Series III aluminum plug with 37 socket contacts. Features “F” electroless nickel finish and “A” polarization for high-density grids.
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D38999/26FD35SA High-Density Signal Consolidation in Size 15 Architectures
The D38999/26FD35SA is a precision-engineered interconnect solution designed for specialized electronic grids that require a massive volume of data channels within a mid-sized physical envelope. Utilizing the size 15 aluminum alloy shell, this straight plug facilitates thirty-seven independent conductive channels through its 15-35 high-density insert arrangement. This configuration is essential for modern sensor arrays and compact flight control systems where a high volume of telemetry and command signals must be consolidated. By housing thirty-seven Size 22D socket contacts, the D38999/26FD35SA allows engineers to achieve high port density without compromising the aerodynamic or structural constraints of the host platform.
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 | A | threaded coupling |
Electroless Nickel Finish and Superior EMI Suppression
The “F” class finish of the D38999/26FD35SA represents a high-purity electroless nickel plating applied over the aluminum housing, providing a clean, durable, and exceptionally conductive surface. This finish is specifically selected for environments where electromagnetic compatibility (EMC) is a critical design factor. The electroless nickel provides a low-impedance ground path across the shell-to-shell interface, which, in conjunction with the plug’s internal grounding spring, ensures 360-degree shielding effectiveness. This prevents external RFI from corrupting the thirty-seven internal signal paths, ensuring that sensitive digital telemetry remains accurate in dense electromagnetic environments.
Alternate A-Keying for Error-Proof System Architecture
The D38999/26FD35SA features the “A” polarization keyway, providing a unique physical indexing configuration that is distinct from the standard “N” position. In complex system panels where multiple size 15 connectors are co-located, utilizing alternate keys like “A” is a critical safety strategy to prevent accidental cross-mating. This physical lockout mechanism ensures that only the specifically keyed plug can be mated with its corresponding receptacle, eliminating the risk of human error during rapid field assembly or equipment overhauls. Combined with the triple-start threaded coupling, the “A” keying ensures a verified and secure connection for mission-critical digital grids.
Precision Socket Fidelity and 15-35 Layout Integrity
Within the size 15 housing, the D38999/26FD35SA employs thirty-seven Size 22D socket contacts, providing a high-fidelity female interface for precision digital and analog signals. These sockets are precision-machined from copper alloy and finished with high-grade gold plating to maintain an ultra-low-resistance electrical path throughout the equipment’s service life. The high-performance dielectric insert ensures that each of the thirty-seven signal paths is electrically isolated, maintaining high insulation resistance even under rapid pressure changes or high humidity. This ensures that the dense signal grid remains free from crosstalk and signal leakage in unpressurized compartments.
Self-Locking Mechanical Stability and Maintenance Efficiency
As a Series III straight plug, the D38999/26FD35SA features a triple-start threaded coupling mechanism with an integrated self-locking ratchet system. This design facilitates a rapid and secure connection with only one full 360-degree turn of the coupling nut, providing tactile and audible confirmation of a verified mate. The internal anti-decoupling device ensures that the connector remains locked even under the severe harmonic vibrations and mechanical shocks typical of aerospace engine compartments. Furthermore, the 100% scoop-proof shell architecture ensures that the thirty-seven socket contacts are recessed deeply enough to prevent any damage if the mating plug is misaligned during the connection process.
FAQ
How many signal channels does the D38999/26FD35SA support?
How many signal channels does the D38999/26FD35SA support?
The 15-35 layout provides thirty-seven independent conductive channels using high-density Size 22D socket contacts, offering one of the highest signal capacities for a size 15 shell.
What are the benefits of the Electroless Nickel (F) finish?
What are the benefits of the Electroless Nickel (F) finish?
The “F” finish offers excellent surface conductivity for superior EMI/RFI shielding and a durable, corrosion-resistant surface suitable for controlled aerospace and industrial environments.
What is the role of the alternate "A" keying position?
What is the role of the alternate "A" keying position?
The “A” keying provides a specific physical orientation that prevents the plug from mating with receptacles keyed to other positions, ensuring safety in multi-connector panels.
Is the D38999/26FD35SA compatible with standard Series III receptacles?
Is the D38999/26FD35SA compatible with standard Series III receptacles?
Yes, as long as the mating receptacle is size 15, has the 35 layout, and is also configured with the “A” polarization keyway, it will be fully intermateable.
Can this connector handle high-vibration aerospace use?
Can this connector handle high-vibration aerospace use?
Yes, the self-locking mechanism and robust aluminum construction are specifically engineered to maintain electrical and mechanical integrity under extreme vibration and shock conditions.
Certification
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