D38999/20FF11PA | 11-Pin Series III Square Flange Receptacle Size 19
The D38999/20FF11PA is a MIL-DTL-38999 Series III wall mount receptacle featuring 11 pin contacts in a size 19 shell. Includes “F” electroless nickel finish and “A” polarization for aerospace grids.
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D38999/20FF11PA Heavy-Duty Series III Triple-Start Threaded Coupling
The D38999/20FF11PA is engineered for specialized electronic grids that demand absolute connection security under extreme mechanical stress. As part of the Series III family, it utilizes a self-locking, triple-start threaded coupling mechanism. This design provides superior vibration resistance compared to bayonet-style connectors, as the constant tension of the threads prevents decoupling even during high-frequency harmonic oscillations. The “20” prefix identifies it as a square flange receptacle, offering a stable four-hole mounting pattern for permanent chassis installation. This structural rigidity is essential for maintaining electrical continuity in flight control systems and heavy tactical vehicles.
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 |
High-Performance 19-11 Layout and A-Keying
Within the size 19 aluminum alloy shell, the D38999/20FF11PA features the 19-11 insert arrangement. This layout provides eleven independent conductive paths using Size 16 contacts, which are capable of carrying higher currents than standard high-density signal pins. This makes the D38999/20FF11PA an ideal choice for power distribution and medium-range signal transmission within dense electronic stacks. The “A” designation specifies a secondary polarization keyway, a critical safety feature that prevents cross-mating when multiple connectors of the same shell size are mounted on the same panel. Each pin contact is precision-machined and gold-plated to ensure a low-resistance interface and long-term protection against atmospheric oxidation.
Environmental Hardening and "F" Class Shielding
The “F” finish indicates that the D38999/20FF11PA is treated with electroless nickel plating over a high-strength aluminum alloy shell. This conductive coating is vital for aerospace electronic grids, as it ensures excellent shell-to-shell continuity for effective EMI and RFI shielding. By acting as a Faraday cage, the housing attenuates external electromagnetic interference that could otherwise degrade sensitive data signals. To withstand aggressive environments, the connector is equipped with high-resilience fluorosilicone interfacial seals and rear wire-sealing grommets. These components create a moisture-proof barrier that maintains performance through rapid pressure changes, high humidity, and exposure to industrial fluids or maritime salt spray.
Mechanical Reliability and Serviceability in the Field
Serviceability is a core feature of the D38999/20FF11PA, which utilizes a rear-release crimp contact system. This allows technicians to install or replace individual wires without the need for complex disassembly of the mounted receptacle. The metallic shell provides 100% scoop-proof protection, ensuring that the eleven pin contacts are recessed deeply enough to prevent damage if the mating plug is misaligned during the connection process. This “future-proof” design ensures that the D38999/20FF11PA remains a reliable interconnect gateway for a wide range of global applications, from automated defense platforms to high-bandwidth industrial telemetry.
Serviceability and Scoop-Proof Protection
Field serviceability is a core advantage of the D38999/20FF11PA, which utilizes a rear-release crimp contact system. This design allows technicians to remove and replace individual wires using standard tools without disassembling the entire panel-mounted receptacle. Additionally, the shell provides 100% scoop-proof protection, meaning the eleven pin contacts are recessed deeply enough to prevent them from being bent or damaged if the mating plug is misaligned during the connection process. This combination of mechanical protection and ease of maintenance makes the D38999/20FF11PA a future-proof choice for global aerospace and industrial telemetry grids.
FAQ
What is the current capacity of the Size 16 contacts in the 19-11 layout?
What is the current capacity of the Size 16 contacts in the 19-11 layout?
Size 16 contacts are designed for higher current loads than standard signal pins, typically supporting up to 13 Amps depending on the wire gauge and environmental conditions.
Why is the "A" keying used instead of the standard "N"?
Why is the "A" keying used instead of the standard "N"?
The “A” keying is used to provide a unique mechanical lockout on panels that have multiple size 19 connectors, ensuring that the D38999/20FF11PA only mates with its intended cable.
Does the "F" finish provide protection against corrosion?
Does the "F" finish provide protection against corrosion?
Yes, the electroless nickel (F) finish is highly durable and provides excellent resistance to atmospheric corrosion while maintaining the conductivity necessary for EMI shielding.
Is the D38999/20FF11PA intermateable with other brands?
Is the D38999/20FF11PA intermateable with other brands?
Yes, as long as the mating plug adheres to the MIL-DTL-38999 Series III standard and shares the same 19-11 layout and “A” polarization, it will be fully compatible.
Can this connector handle the vibration of a jet engine?
Can this connector handle the vibration of a jet engine?
Absolutely. The self-locking triple-start threads are specifically engineered to stay mated under the extreme vibration and mechanical shock levels found in modern aerospace engines.
Certification
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