D38999/20FJ35PD | 128-контактный квадратный фланцевый разъем серии III (ключ D)
The D38999/20FJ35PD is a size 25 MIL-DTL-38999 Series III receptacle with 128 pin contacts. Features “D” polarization and “F” electroless nickel finish for maximum-density grids.
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D38999/20FJ35PD Ultimate Signal Density with 25-35 Layout
Он D38999/20FJ35PD is engineered for specialized electronic grids that require the highest possible concentration of signal channels within a single interface. Utilizing the size 25 shell, the largest in the MIL-DTL-38999 standard, this model facilitates one hundred and twenty-eight independent conductive paths through its 25-35 insert arrangement. These Size 22D pin contacts are precision-machined and gold-plated to ensure minimal contact resistance and maximum protection against oxidation. This ultra-high-density configuration allows system designers to consolidate massive amounts of sensor data, control logic, and communication signals, significantly reducing the number of individual connectors required on a single bulkhead.
Основные характеристики
Материал оболочки | Номинальное напряжение | Текущий рейтинг | Рабочая температура | Степень защиты от проникновения влаги и пыли | Циклы спаривания | Ключевая модуляция и поляризация | Соединение |
|---|---|---|---|---|---|---|---|
Алюминиевый сплав | ~1000 В переменного тока | ~23 А | от -65 °C до +200 °C | IP67 | 500 | D | резьбовая муфта |
Heavy-Duty Square Flange and Mechanical Integrity
As a Type 20 receptacle, the D38999/20FJ35PD features a robust square flange housing designed for permanent four-point mounting on equipment panels. This stable mounting interface is critical for supporting the substantial weight and mechanical tension of a 128-wire cable harness. The Series III triple-start threaded coupling mechanism provides a self-locking connection that remains secure under extreme harmonic vibration and mechanical shock. This structural rigidity ensures that electrical continuity is never compromised, even in the most demanding environments such as jet engine control units or heavy tactical ground vehicles where mechanical fatigue is a constant risk.
Specialized D-Keying for Advanced System Safety
The “D” designation in the part number indicates an alternate polarization keyway, providing a vital physical safeguard for complex electronic architectures. In mission-critical grids where multiple size 25 connectors are co-located on the same panel, the “D” keying ensures that only a matching “D” key plug can be fully engaged. This prevents the catastrophic risk of cross-mating different functional circuits—such as primary power and sensitive telemetry lines. This standardized indexing logic provides an intuitive, error-proof mechanical lockout, streamlining both the initial assembly process and long-term field maintenance in high-pressure operational scenarios.
Environmental Resilience and "F" Class Conductivity
The “F” finish indicates that the D38999/20FJ35PD is treated with electroless nickel plating over its high-strength aluminum alloy shell. This conductive finish is essential for maintaining an effective Faraday cage around the 128-pole interface, ensuring superior EMI and RFI shielding performance in electromagnetically noisy environments. To safeguard against environmental ingress, the connector is equipped with high-resilience fluorosilicone interfacial seals and rear wire-sealing grommets. These components create a moisture-proof and dust-proof barrier that maintains its integrity during rapid pressure changes at high altitudes and exposure to aggressive industrial fluids or maritime salt spray.
Scoop-Proof Architecture and Field Serviceability
Reliability in high-stakes environments is further enhanced by the D38999/20FJ35PD’s 100% scoop-proof shell design. This feature ensures that the one hundred and twenty-eight pin contacts are recessed deeply enough within the housing to prevent any bending or damage if the mating plug is misaligned during the connection process. For ease of service, the receptacle utilizes a rear-release crimp contact system, allowing technicians to install or replace individual wires using standard tools without disassembling the entire panel mount. This combination of mechanical protection and serviceability makes the D38999/20FJ35PD a future-proof interconnect solution for the most demanding global aerospace and defense applications.
Часто задаваемые вопросы
How many contacts are provided in the 25-35 layout?
How many contacts are provided in the 25-35 layout?
The 25-35 arrangement provides 128 individual signal channels using size 22D pin contacts, which is the highest contact density available in the MIL-DTL-38999 Series III family.
What is the specific purpose of the "D" keyway?
What is the specific purpose of the "D" keyway?
The “D” keyway is an alternative polarization that prevents this connector from mating with standard “N” or other alternate key plugs, ensuring safety on panels with multiple identical shells.
Does the "F" finish help with grounding and EMI?
Does the "F" finish help with grounding and EMI?
Yes, the electroless nickel (F) finish is highly conductive, providing an excellent ground path and effective shielding to protect the 128 signal channels from electromagnetic interference.
Is the D38999/20FJ35PD intermateable with Series I or II?
Is the D38999/20FJ35PD intermateable with Series I or II?
No, the Series III uses a unique triple-start threaded coupling and shell geometry that is not compatible with the bayonet-style Series I or Series II connectors.
Can this connector handle the vibration found in aerospace platforms?
Can this connector handle the vibration found in aerospace platforms?
Absolutely. The self-locking triple-start threads are specifically engineered to remain secure under the extreme vibration and mechanical shock levels typical of modern aerospace and defense platforms.
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