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Amphenol AT Circular Connectors

AT Circular (ATC) thermoplastic upgraded connectors mate with a positive reverse bayonet retention system and can withstand current up to 13 A. Sealed and rated to 125°C, Amphenol's ATC connectors are ideal for communication and diagnostic testing in heavy duty trucks, buses, construction and agriculture equipment. Available in 3, 5 and 9way receptacles, these connectors are drop-in replacements to existing panel designs. The 9way receptacles are also available with a jam nut for quick assembly.

Amphenol's ATC reverse bayonet coupling design allows for quick mating and unmating. These corrosion resistant, heavy-duty industrial connectors are environmentally sealed against moisture and contaminants. Durable to 100 mating cycles, the connectors' contact retention system helps decrease installation costs and increase reliability.

Features & benefits include:
  • Jam nut and square flange mounts available for 3way, 5way, and 9way.
  • Caps available with and without lanyards.
  • Reverse bayonet coupling.
  • AT Contract technology available in gold or nickel.
  • Temperature rated -55°C to +125°C. Higher temperatures may be possible upon request.
  • Environmentally sealed.
  • 9way receptacles are in accordance to the interface of the diagnostic connector of the specification J1939.
  • Backward compatible and intermateable to other circular connectors in the industry.


  • Heavy Equipment
  • Transportation
  • Marine
  • Energy


  • Class 8 trucks
  • Trailers
  • ECU's
  • Construction equipment
  • Agriculture/Forestry
  • Industrial pumping
  • Power generation
  • Buses
  • Fire/resuce
  • Garbage trucks
  • Tractors
  • Off highway
  • Marine propulsion

See also:
Amphenol_AT_Circular_Connectors.pdf for more product information, specifications, applications and ordering information.

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