Circular Connectors (Military Connector)
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MIL-DTL-38999 II Series
Applications of Circular Connectors
Our MIL-DTL-38999 II series circular connectors are designed for crucial circuit signal connections in various industries.
General Information
- Compliant with the industry-standard MIL-DTL-38999 II series
- Quick and secure bayonet coupling
- The smallest size, lightest weight, and shortest shell length among the D38999 series
- EMI/RFI shielding capabilities
- Removable contacts for easy installation, without anti-oblique mating, making socket-to-pin connections in tight spaces hassle-free
Environments
These lightweight connectors are built to thrive in environments with low to moderate vibrations and are ideal for applications where harsh winds, sand, and humidity are prevented.
Main Technical Performance
Mechanical Performance
- Shell materials available: Aluminum alloy, stainless steel
- Plating options:
- Class B: Cadmium plating
- Class E: Stainless steel passivation
- Class F: Chemical nickel plating
- Contact materials: Gold-plated copper alloy for superior conductivity; available in crimp, solder, and printed circuit board configurations
- Mechanical lifespan: 500 mating cycles
- Vibration resistance: Withstands random vibrations at frequencies of 100-1000Hz with a power spectral density of 1g²/Hz
- Shock resistance: Handles 3ms half-sine wave with peak acceleration up to 300g
Environmental Performance
- Temperature range: B-class (-65 ˚C to 175 ˚C), E and F class (-65 ˚C to 200 ˚C)
- Salt spray test results: B-class (500 hours), E class (1000 hours), F-class (48 hours)
- High humidity resistance: Up to 98% relative humidity at 40 ˚C
- Operating altitude: Up to 30,480 meters
Electrical Performance
Contact resistance and current rating | Contact ID | Diameter (mm) | Resistance (mΩ) | Current (A) |
| 22D | Ø0.76 | ≤12 | 5 |
| 20# | Ø1.00 | ≤5 | 7.5 |
| 16# | Ø1.60 | ≤2.5 | 13 |
| 12# | Ø2.40 | ≤1.5 | 23 |
EMI shielding: Provides a minimum attenuation of 45dB from 100MHz to 1GHz
Withstanding voltage (V):| Service rating | M | Ⅰ | Ⅱ |
| Sea level | 1300 | 1800 | 2300 |
| 21000m | 800 | 1000 | 1000 |
- Insulation resistance: ≥5000MΩ under normal conditions, ≥100MΩ under humid conditions
- Shell-to-shell continuity: Class B: ≤2.5mΩ, Class F: ≤1.0mΩ, Class E: ≤50mΩ
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