MIL-DTL-38999 Series I - LJT Connectors

Amphenol® MIL-DTL-38999 Series I Connectors were developed to meet the needs of the aerospace industry and provided the impetus for the development of the MIL-C-38999 specifications, which later was superseded by MIL-DTL-38999.  Amphenol's MIL-DTL-38999 Series I and commercial LJT series connectors meet or exceed the Mil-Spec requirements and are available in aluminum or stainless steel as well as several different finish options.  Amphenol is also qualified to the MIL-DTL-27599 specification for Series I connectors.

FAQs: MIL-DTL-38999 Series I LJT Connectors

What are MIL-DTL-38999 Series I LJT connectors?

The MIL-DTL-38999 Series I LJT connector is a lightweight circular connector with a three-point bayonet coupling mechanism. Series I is qualified to MIL-DTL-38999 and is designed for aerospace and military applications requiring quick mating, vibration resistance, and environmental sealing.

What applications are MIL-DTL-38999 Series I LJT connectors used for?

MTL-DLT-38999 Series I LJT connectors are ideal for a variety of harsh environment applications such as:

• Military and commercial aerospace systems
• Avionics and flight-critical electronics
  
• Defense and weapon systems
  
• Ground support and test equipment

Are Series I LJT connectors environmentally sealed?

Yes. Series I LJT connectors provide environmental sealing through:

• A fluorinated silicone interfacial seal at the mating face
  
• A main joint gasket installed in the receptacle
  

For applications requiring pressure or fluid containment, hermetic Series I LJT receptacles are available with controlled leakage rates

What are the most common shell sizes for MIL-DTL-38999 Series I connectors?

Series I LJT connectors are available in shell sizes 9, 11, 13, 15, 17, 19, 21, 23, and 25. 

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• Lightweight, Space Saving Design
• Contact Protection - 100% scoop-proof design prevents bent pins and short circuits during mating
• Quick Positive Coupling - three-point bayonet lock system with tactile and visual confirmation using the connector’s built-in visual indicator
• Mismating Eliminated - with 5 key/keyway design
• Error Proof Alternate Positioning - insured by different key/ keyway locations
• EMI Shielding - grounding fingers standard. 
• In addition to standard grounding fingers, Series I LJT connectors achieve effective EMI/EMP shielding through: 
  • Metal-to-metal coupling 
  • Conductive shell finishes 
  • Integrated grounding fingers 
• EMI shielding performance is finish-dependent and varies by material and configuration. Refer to the catalog finsih table for finsih-specific EMI performance data. 
• Nine Shell Sizes and a Variety of Shell Styles. Standard shells sizes include: 9, 11, 13, 15, 17, 19, 21, 23, 25. 
• Contact Options - size 8, 10, 12, 16, 20, 22M and 22D Crimp, Solder, PCB, Wire wrap, Coax, Twinax, Triax, Thermocouple, Fiber Optic and Filter
• Supports 2 to 128 circuits, depending on shell size and insert arrangement.
• Fixed Solder Contacts - Amphenol MIL-DTL-38999 Series I LJT are available in solder versions as both Commercial and Military qualified to MIL-DTL-27599
• “Breakaway” Lanyard Release Style - available in LJT plugs. Provides quick disconnect of the connector plug and receptacle with axial pull on the lanyard.
• Inventory Support Commonality - uses standard MIL-DTL-38999 contacts, insert arrangements and application tools.
• Available with cadmium over nickel-plated aluminum shells and other finish options 
  • Certain finishes are rated for up to 500 hours of salt spray resistence 
  • Corrosion performance varies by finish selection 
  • For exact corrosion performance, consult the catalog finish table or contact Amphenol Aerospace. 
• RoHS Compliant Options Available 

Applications

• Military and commercial aircraft
• Avionics and flight-critical electronics
• Communications and electronic warfare equipment
• Armored vehicles and ground combat systems
• Missile systems
• Shipboard and naval electronics
• Testing and ground support equipment