Product Overview

M55302 Connectors

MIL-DTL-55302 (formerly MIL-C-55302) specifies requirements for high-density, microminiature rectangular electrical connectors, commonly known as Micro-D connectors. These connectors are designed for applications where extreme miniaturization, high contact density, and reliable performance in harsh environments are critical. They are extensively used in military, aerospace, medical, and industrial electronics where space and weight are severely limited.

M55302 connectors utilize a unique "twist-pin" contact system (or similar high-reliability contact technology) that provides superior mating reliability and resistance to vibration and shock. Their robust construction, often with metal shells and precise contact spacing, ensures excellent electrical performance and EMI/RFI shielding. The standard covers various configurations, including wired, PCB mount, and custom arrangements, making them highly adaptable for complex electronic systems.

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Features and Benefits

  • Microminiature & High-Density: Offers extremely small size with a very high number of contacts, enabling significant space and weight savings.
  • High Reliability (Twist-Pin Contacts): Utilizes advanced contact technology for superior mating reliability, low contact resistance, and excellent performance under vibration and shock.
  • Robust Construction: Durable materials and design ensure mechanical stability and resistance to harsh environmental conditions.
  • EMI/RFI Shielding: Metal shells provide effective shielding against electromagnetic and radio-frequency interference.
  • Environmental Sealing: Provides sealing against moisture, dust, and other contaminants for reliable operation in challenging environments.
  • Versatile Configurations: Available in wired, PCB mount (through-hole, surface mount), and custom arrangements, offering high design flexibility.
  • Long Mating Life: Designed for a high number of mating cycles without significant degradation of performance.
  • Hermetic Sealing Options: Specialized versions can provide hermetic sealing for vacuum or pressure applications.

Specifications, Parts, and Filters

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Current Rating
1A to 3A (per contact) — Dependent on contact size and wire gauge
Voltage Rating
200 VAC to 600 VAC (sea level) — Max operating voltage
Insulation Resistance
5000 MΩ min — At 500 VDC
Dielectric Withstanding Voltage (DWV)
600 VAC to 1000 VAC (sea level) — Between contacts, between contacts and shell
Contact Resistance
10 mΩ max — Initial, per contact
Shielding Effectiveness
50 dB to 70 dB — At 100 MHz to 1 GHz

Mating Cycles
500 cycles min — Up to 1000 cycles for high-durability versions
Contact Retention (Axial)
3 lbs (13 N) min — Per contact
Shell Material
Aluminum Alloy, Stainless Steel — Various platings (e.g., Electroless Nickel, Cadmium)
Contact Material
Copper Alloy — Gold plating over Nickel underplate
Insulator Material
Liquid Crystal Polymer (LCP), Epoxy — High dielectric strength
Coupling Mechanism
Jackscrews, friction — For secure mating
Wire Sizes Accepted
26 AWG to 30 AWG — Dependent on contact size
Contact Spacing
0.050" (1.27mm) centerline — Standard for Micro-D

Operating Temperature
to +125∘C — Standard range, higher for specific materials
Thermal Shock
MIL-STD-202, Method 107 — Rapid temperature changes
Humidity
MIL-STD-202, Method 103 — High humidity, non-condensing
Salt Spray / Corrosion
MIL-STD-202, Method 101 — 48 hours to 500 hours, dependent on plating
Vibration
MIL-STD-202, Method 204 — Excellent resistance, no electrical discontinuity
Shock
MIL-STD-202, Method 213 — Excellent resistance, no electrical discontinuity
Fluid Resistance
Resistant to common aerospace fluids — Per relevant MIL standards

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