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AT Circular Series | SAE J1939 Protocol

Cylindrical, Thermoplastic, Non Threaded Coupling, Harsh Environment, Power Connector

Description

The SAE J1939 protocol-compatible AT Circular Series is a high-performance, environmentally sealed connector solution engineered for demanding heavy equipment applications in construction, agriculture, trucking, industrial controls, and transportation. These rugged connectors provide reliable and secure connections in harsh operating environments, ensuring consistent performance for critical electrical systems.

Key Features

The AT Circular Series features a robust thermoplastic housing designed to withstand extreme conditions, including exposure to dirt, moisture, and vibration. The series is equipped with a reverse bayonet coupling mechanism, enabling quick and secure mating without the need for additional tools. Available in jam nut and square flange mounting styles, these connectors offer easy installation with optional strain relief for enhanced durability. Additionally, an optional cap and lanyard protect the connectors when not in use, preserving long-term performance in rugged environments.

With its 9-pin black receptacle, the AT Circular Series is fully compatible with the SAE J1939 protocol, a standardized communication system widely used in heavy-duty vehicles and industrial applications. This ensures seamless integration into existing networks, enhancing data communication efficiency and system interoperability. The SAE J1939 protocol support makes these connectors ideal for vehicle diagnostics, telematics, and electronic control unit (ECU) connections.

Applications

The AT Circular Series is optimized for industries requiring rugged, sealed interconnect solutions, particularly in applications where the SAE J1939 protocol is essential for vehicle and equipment communication. Common application areas include:

  • Heavy-Duty Vehicles: Supports the SAE J1939 protocol for vehicle diagnostics, data logging, and telematics in trucking, construction, and agricultural machinery.
  • Industrial Automation: Ensures reliable data transmission in control systems, robotics, and factory automation.
  • Off-Highway Equipment: Provides robust connectivity in harsh conditions for mining, forestry, and material handling equipment.
  • Marine & Transportation: Delivers durable and moisture-resistant connections in railway, marine vessels, and public transportation networks.
Specifications

Amphenol Industrial Operations designed the AT Circular Series with precision-machined contacts that are available with Nickel or Gold plating, providing superior conductivity and corrosion resistance. The contacts are engineered to deliver consistent performance over extended operating lifespans, making them a cost-effective choice for mission-critical applications.

The series meets RoHS compliance standards and is specifically designed to resist environmental hazards, including extreme temperatures, water ingress, and mechanical stress. The contact retention system enhances connector reliability by securing the electrical contacts in place, reducing installation complexity and associated costs.

Key performance specifications include:

  • Reverse bayonet coupling for secure and quick mating
  • Thermoplastic housing for superior durability
  • Contact options with Nickel or Gold plating
  • Sealed against moisture, dust, and other contaminants
  • Optional strain relief for increased cable protection
  • Available in multiple configurations, including 9, 6, 5, and 3 contacts
  • RoHS compliant and designed for long-term performance
Why Choose AT Circular Series | SAE J1939 Protocol?

The AT Circular Series offers a superior interconnect solution tailored for heavy-duty and industrial applications where reliability, environmental sealing, and ease of installation are crucial. With support for the SAE J1939 protocol, these connectors enable seamless data exchange in modern vehicle and equipment communication networks, ensuring compliance with industry standards and long-term system performance.

Whether used in construction vehicles, agricultural equipment, or industrial automation, the AT Circular Series from Amphenol Industrial Operations provides the durability and flexibility needed to meet the toughest operational demands. Its advanced design, coupled with high-quality materials and precision engineering, makes it the go-to solution for applications requiring a rugged and cost-effective interconnect system.

Features & Benefits

Jam Nut and Square Flange Mounting Solutions
Quick Mating and Unmating - Reverse Bayonet Coupling
Environmentally Sealed - Sealed against moisture and contaminants
Contact retention system which decreases installation costs and increases reliability
Strain relief option for enhanced durability
Optional cap and lanyard for additional protection
Meets J1939 specification for vehicle data communication
Heavy-duty thermoplastic shell designed for rugged environments
Available in 9, 6, 5, and 3 contact layouts
Ideal for heavy equipment, industrial controls, transportation, marine, and energy applications
RoHS Compliant Product

Specifications

Electrical
Voltage
1500V AC
Current Rating
13A
Number of contacts
3, 5, 6 and 9
Certifications
RoHS
Mechanical
Operating Temperature Range
-55ºC to +125ºC
Durability(Mating Cycle)
No electrical or mechanical defects after 100 cycles of engagement or disengagement
Corrosion Resistance
48 hours of salt spray per MIL STD 1344 method 1001
Moisture Resistance
Water does not penetrate seals when submerged in 3 feet of water
Fluid Resistance
Connectors show no damage when exposed to most fluids used in industrial applications
Thermal Shock
-40º/+125ºC, 100 cycles, 1 hour per cycle
Crimp Tensile Strength
25 lbs
Wire size (mm²)
16 AWG / 1.5 mm²
Locking element
Reverse bayonet
Material
Contact plating
Nickel and Gold
Contacts
Copper alloy
Sealing components
Neoprene or Silicone
Shell
Thermoplastic
Environmental
Temperature range
-55ºC to +125ºC
RoHS
Yes
REACH
Available
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Amphenol Industrial's product lines consist of rectangular, standard miniature, fiber optic, EMI/EMP filter, and a variety of special application connectors.

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