Micro-Bayonet | Rugged Micro Bayonet Circular Connector

Micro bayonet circular connector solutions like the Micro-Bayonet Connector Series give designers a compact, lightweight way to route low power and signal lines in harsh industrial environments without the cost or size of full mil-spec circulars. With a rugged metal shell, triple bayonet coupling, high-density size 22D contacts, and EMI shielding support, Micro-B provides a reliable middle ground between consumer-style connectors and heavy-duty military interfaces.

Table of Contents

• Overview
• Key Features & Benefits
• Typical Applications
• Performance & Design Highlights
• Design Considerations & Integration Tips
• Resources & Related Solutions
• Frequently Asked Questions

Micro Bayonet Circular Connector Overview

The Micro-Bayonet Connector Series is a cylindrical, metal micro bayonet circular connector family optimized for compact low power and signal interconnects. It was developed for applications where electrical performance, EMI control, environmental sealing, and cost efficiency are important, but traditional mil-grade circular connectors may be larger or more expensive than the design requires.

Each micro bayonet circular connector combines a robust 1/4-turn triple bayonet coupling system with an internal EMI ground spring to support strong shell-to-shell conductivity. High-density insert patterns with size 22D contacts allow up to 15 circuits in a small footprint, making Micro-B well suited for compact control boxes, sensor modules, distributed I/O, and other space-constrained equipment.

Micro-B is also a practical alternative to D-sub and other rectangular signal connectors. Its sealed circular interface, metal shell construction, and fast tool-less mating help improve durability, shielding, and serviceability in industrial and transportation environments. For many designs, one micro bayonet circular connector can help consolidate multiple legacy signal connections while improving environmental performance.

Key Features & Benefits

• Compact, high-density circular platform — Small shell size with high-density insert patterns helps shrink enclosure size and PCB real estate while maintaining clear routing for low power and signal circuits in a micro bayonet circular connector format.
• Triple bayonet 1/4-turn coupling — Positive, 1/4-turn bayonet mating delivers quick connect/disconnect performance and strong vibration resistance, making the connector ideal for frequent servicing and field maintenance.
• Rugged metal shell construction — Aluminum shells provide a high strength-to-weight ratio and support multiple conductive plating options, including finishes rated for extended salt-spray performance.
• Excellent EMI performance — An internal EMI ground spring and shell-to-shell bonding support shielding performance when used with appropriate shielded backshells and cable.
• High signal density with size 22D contacts — Stamped and formed size 22D contacts simplify harnessing and allow more circuits in a smaller micro bayonet circular connector envelope.
• Tool-less, fast mating — Bayonet coupling with clear tactile feedback reduces mating time and helps minimize the risk of incomplete engagement in production and service environments.
• Flexible termination options — Crimp contacts, tape-and-reel options for automated processing, and PCB-tail variants support cable assemblies, harness manufacturing, and direct board termination.
• Versatile mounting styles — Available in in-line plug and 2-hole flange receptacle configurations to support cable-to-panel and cable-to-device architectures.
• Harsh-environment performance — Operating temperature range from -40 °C to +125 °C, high shock and vibration resistance, and ingress protection up to IP67 in the mated condition with sealed backshells.
• Compliance and safety — RoHS and REACH compliant, designed to meet smoke, toxicity, and flammability requirements, with UL certification support for global use.
• Cost-effective alternative to D-sub — Provides environmental sealing, EMI performance, and circular ergonomics while staying within industrial cost targets.

These features make the Micro-Bayonet Connector Series a strong micro bayonet circular connector option for engineers who need compact signal density, rugged mechanical performance, and environmental protection in one circular interface.

Typical Applications

Micro-Bayonet micro bayonet circular connector solutions are used wherever compact, reliable signal and low-current power connections are needed in harsh or semi-harsh environments, including:

• Factory automation and robotics — I/O modules, servo drives, sensors, encoders, and control boxes exposed to vibration, dust, and washdown environments where sealed circular connectors help improve uptime.
• Hybrid and electric vehicles — Low-current control wiring, sensor and feedback harnesses, charging station electronics, and auxiliary subsystems where sealed, shielded connector interfaces are required.
• Industrial instrumentation — Measurement systems, analyzers, and portable instruments that must survive field handling and outdoor conditions while maintaining stable signal integrity.
• Telecommunications and networking — Outdoor radio units, small cells, and support electronics where compact connector interfaces reduce panel space and improve sealing.
• Medical and lab equipment — Compact instruments, pumps, and diagnostic equipment that benefit from quick-connect circular interfaces with reliable EMI performance.
• Security, surveillance, and vision systems — Cameras, controllers, and sensor nodes exposed to dust, moisture, and temperature cycling that benefit from rugged connector terminations.
• Unmanned platforms and mobility equipment — UAV subsystems, AGVs, and autonomous machines that need lightweight, vibration-resistant signal interconnects.

In these applications, a micro bayonet circular connector can help reduce panel space, simplify harness routing, and improve long-term serviceability compared with less rugged commercial signal connector options.

For broader system architectures, Micro-Bayonet can be combined with higher power circulars and rectangular power interfaces across Amphenol Industrial’s Factory Automation, eMobility, and Additional Industries portfolios.

Performance & Design Highlights

Electrical Performance

• Recommended operating voltage: up to 250 VAC RMS for typical low power and signal applications using size 22D contacts in a micro bayonet circular connector.
• Current rating: up to 3 A per size 22D contact, depending on insert arrangement and application conditions.
• Contact configurations: high-density layouts supporting 7, 10, or 15 contacts in a compact shell.
• Insulation resistance: 1000 MΩ minimum at 500 V under typical test conditions.
• Contact resistance: 22 mΩ maximum per contact helps maintain low signal loss.

Mechanical Performance

• Mating cycles: rated for approximately 500 mating/unmating cycles with appropriate plating.
• Coupling system: triple bayonet 1/4-turn mechanism provides quick engagement with strong mechanical retention.
• Wire sizes: supports typical signal wire ranges such as 22–26 AWG for compact harnessing.
• Keying options: multiple keying orientations help prevent mis-mating when several similar micro bayonet circular connector interfaces share a panel.

Materials & Construction

• Shell material: aluminum alloy for high strength and low weight.
• Contact material and plating: copper alloy contacts with tin and/or gold plating options for reliable conductivity and corrosion resistance.
• Insulator material: high-performance engineering plastic designed for dimensional stability and dielectric performance across the operating temperature range.
• EMI components: conductive copper alloy EMI rings and optional shield-termination hardware for 360° cable shielding.
• Plating options: conductive platings including gray ZnNi and electroless nickel to support salt-spray performance.

Environmental & Standards

• Operating temperature range: -40 °C to +125 °C for use in demanding industrial and transportation environments.
• Ingress protection: up to IP67 in the mated condition when used with sealed backshells and appropriate cable preparation. For a general overview of ingress protection classifications, see the IEC IP ratings guide.
• Corrosion resistance: shell plating options support extended salt-spray exposure requirements.
• Compliance: RoHS and REACH compliant, designed to meet smoke, toxicity, and flammability requirements; UL support for global approvals.

Design Considerations & Integration Tips

• Choose the right insert pattern — Match the number of contacts to your signal count and future expansion needs. High-density layouts help consolidate multiple D-sub or terminal connections into a single micro bayonet circular connector.
• Plan for shielding and grounding — For noisy environments, specify shielded cable and an appropriate EMI backshell so the internal EMI spring and shell-to-shell bonding can deliver full shielding performance.
• Consider keying and coding — When multiple Micro-B connectors are used on the same panel or box, select unique keying orientations to help prevent mis-mating during assembly and service.
• Verify IP and environmental requirements — For washdown or outdoor use, pair the connector with sealed backshells and cable glands, and confirm that the complete assembly meets your target IP rating and temperature profile.
• Optimize harness manufacturing — Take advantage of stamped-and-formed contacts and tape-and-reel options to support automated crimping and high-volume harness production.
• Allow clearance for bayonet coupling — Provide enough hand access and rotation space for the 1/4-turn bayonet coupling, especially on densely populated panels.

Resources & Related Solutions

For applications that require additional circular connector options, engineers can also review the PT Series, UPT Connector Series, Max-M12, and LPT Series product families for power, signal, and data connection requirements.

Micro-Bayonet is a strong fit when a design needs a compact signal connector with rugged circular construction, environmental sealing, EMI support, and fast bayonet mating. It helps bridge the gap between standard commercial signal connectors and larger military-style circular solutions.

Frequently Asked Questions

What is a micro bayonet circular connector?

A micro bayonet circular connector is a compact circular interconnect that uses bayonet-style coupling for quick, secure mating. Amphenol Industrial’s Micro-Bayonet Connector Series is designed for low power and signal applications that require environmental sealing, EMI performance, and rugged mechanical reliability.

What electrical ratings does the Micro-Bayonet connector support?

Typical Micro-Bayonet configurations support up to 250 VAC RMS and up to 3 A per size 22D contact, depending on the insert arrangement, cable, and application conditions. Engineers should review the product documentation for detailed electrical and environmental ratings.

Is Micro-Bayonet an alternative to D-sub connectors?

Yes. Micro-Bayonet can be used as a rugged circular alternative to D-sub connectors when designers need better sealing, stronger strain relief, EMI shielding support, and faster mating in industrial, transportation, or outdoor applications.

What contact configurations are available?

The Micro-Bayonet Connector Series supports high-density contact layouts, including 7, 10, and 15 contact configurations. These arrangements help designers route multiple low-current signal circuits through a compact circular connector interface.

Where are Micro-Bayonet connectors commonly used?

Micro-Bayonet connectors are commonly used in factory automation, robotics, industrial instrumentation, hybrid and electric vehicles, telecommunications, security systems, medical equipment, and compact electronic systems that need reliable low-current signal connections.