D38999/20FD35PCN | 37-Pin Series III PCB Mount Receptacle (Key N)
The D38999/20FD35PCN is a MIL-DTL-38999 Series III square flange receptacle with 37 pin PCB contacts. Features “N” polarization and “F” electroless nickel finish for board-level integration.
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D38999/20FD35PCN Direct PCB Integration and System Efficiency
The D38999/20FD35PCN is engineered for specialized electronic grids that require a direct, high-reliability transition from external cabling to internal printed circuit boards. Unlike standard crimp versions, this model features fixed PCB tail contacts, allowing the receptacle to be soldered directly onto a rigid or flexible board. This architectural choice eliminates the need for internal wire harnesses, significantly reducing the overall weight and complexity of the device enclosure. The square flange design (Type 20) provides a stable four-point mounting interface, which ensures that the mechanical stress of mating and unmating is absorbed by the equipment chassis rather than the delicate solder joints on the PCB.
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 (Normal) | threaded coupling |
High-Density 15-35 Layout and Standard N-Keying
Within its size 15 aluminum alloy shell, the D38999/20FD35PCN utilizes the 15-35 high-density insert arrangement to provide thirty-seven independent conductive paths. These Size 22D pin contacts are precision-machined and gold-plated to maintain a low-resistance electrical path and superior signal integrity. The “N” designation specifies the normal polarization keyway, which is the most widely compatible indexing standard for Series III interconnects. This ensures universal intermateability with standard-issue plugs, making the D38999/20FD35PCN a versatile gateway for high-bandwidth data and control signals in modern avionics and tactical communication stacks.
Environmental Hardening and EMI Shielding
As an “F” class component, the D38999/20FD35PCN is finished with electroless nickel plating, providing an optimal balance of corrosion resistance and electrical conductivity. This finish is essential for establishing a low-impedance ground path to the chassis, which creates an effective Faraday cage for EMI and RFI shielding. Internally, the connector is equipped with high-resilience fluorosilicone interfacial seals that protect the 37-pole interface from moisture and dust ingress. This level of hardening ensures that the board-level electronics remain isolated from aggressive atmospheric conditions, such as salt spray, high humidity, and the rapid pressure changes encountered in unpressurized aerospace compartments.
Mechanical Durability and Self-Locking Security
The D38999/20FD35PCN employs the signature Series III triple-start threaded coupling system, which offers a robust self-locking mechanism. This design is highly resistant to the extreme vibration and mechanical shock common in heavy industrial machinery and defense platforms. The scoop-proof shell design ensures that the thirty-seven pins are recessed deeply enough to prevent damage during blind mating or accidental misalignment. By combining the precision of PCB-mount contacts with the mechanical security of the Series III interface, the D38999/20FD35PCN provides a future-proof interconnect solution for engineers developing ruggedized, high-performance electronic modules.
Scoop-Proof Shell Design and Contact Protection
A critical safety feature of the D38999/20FD35PCN is its 100% scoop-proof shell architecture. This design ensures that the thirty-seven delicate PCB pin contacts are recessed deeply within the aluminum housing, making it impossible for the mating plug to strike or damage the pins if it is accidentally tilted during the connection process. This is particularly vital for back-panel applications and dense electronic grids where visibility is limited and technicians must rely on tactile feedback for mating. By preventing bent pins and insulator damage, the D38999/20FD35PCN significantly increases the long-term reliability of the board-to-cable interface in field-serviceable aerospace units.
FAQ
What does scoop-proof mean for the D38999/20FD35PCN?
What does scoop-proof mean for the D38999/20FD35PCN?
It means the shell is long enough to prevent the mating connector from touching the internal pins until they are correctly aligned, preventing accidental bending of the 37 pins.
Is this receptacle suitable for blind-mating applications?
Is this receptacle suitable for blind-mating applications?
Yes, the scoop-proof design and the self-locking triple-start threads make it an excellent choice for environments where the user cannot see the connection point clearly.
How does the square flange handle mechanical torque?
How does the square flange handle mechanical torque?
The four-point mounting system of the D38999/20FD35PCN distributes the rotational torque of the threaded coupling evenly across the panel, protecting the internal PCB solder points from stress.
Can the PCB tails be hand-soldered or only wave-soldered?
Can the PCB tails be hand-soldered or only wave-soldered?
The PCB tails on the D38999/20FD35PCN are compatible with both precision hand-soldering and automated wave-soldering processes, providing flexibility for different manufacturing scales.
What is the impact of the Series III threads on contact wear?
What is the impact of the Series III threads on contact wear?
The precision threads ensure a perfectly linear mating path, which reduces friction on the gold-plated surfaces of the 37 pins, extending the operational life and mating cycles of the connector.
Certification
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