Circular Connectors

Circular Connectors - Contacts

Part Number	Description / PDF	Quantity
00601761 Wickmann / Littelfuse	MALE CONTACT 1.5	0
00605200 Wickmann / Littelfuse	KIT CONT. FOR SOCKET EBS-7P (4 M	20
00604990 Wickmann / Littelfuse	FEMALE CONTACT WITH SCREW TERMIN	0
00601762 Wickmann / Littelfuse	MALE CONTACT 1.5	0
00607260 Wickmann / Littelfuse	MALE CONTACT 0.5 MMQ PACK. 1000	0
00602800 Wickmann / Littelfuse	FEMALE CONTACT 2.5	0
00601760 Wickmann / Littelfuse	MALE CONTACT 1.5	0
00604100 Wickmann / Littelfuse	KIT CONT. FOR PLUG ABS-5P (4 MMQ	0
00601660 Wickmann / Littelfuse	MALE CONTACT 6 MMQ PACK. 100 PZ	1000
00607500 Wickmann / Littelfuse	KIT CONT. FOR TO CRIMP SOCKET 25	0
00601960 Wickmann / Littelfuse	FEMALE CONTACT 1.5 WITH PACKAGIN	0
00601900 Wickmann / Littelfuse	FEMALE CONTACT 1.5 WITH PACKAGIN	0
00604000 Wickmann / Littelfuse	KIT CONT. FOR SOCKET ABS-5P (4 M	0
00602460 Wickmann / Littelfuse	MALE CONTACT 4MMQ WITH PACKAGING	0
00602600 Wickmann / Littelfuse	FEMALE CONTACT 1	0
00602300 Wickmann / Littelfuse	MALE CONTACT 1	0
11133 Wickmann / Littelfuse	SOCKET	0
11177 Wickmann / Littelfuse	SOCKET	0
00607800 Wickmann / Littelfuse	5MMQ FEMALE CONTACT 1/100	0
00607700 Wickmann / Littelfuse	5MMQ MALE CONTACT 1/100	0

Circular Connectors - Contacts

1. Overview

Circular connectors - contacts are electro-mechanical components designed to establish electrical connections between circuits in a circular interface configuration. These contacts serve as critical conduits for power, signal, or data transmission in complex systems. Their importance spans across industries requiring reliable connectivity in harsh environments, including aerospace, industrial automation, and medical devices. Modern advancements demand miniaturization, higher bandwidth, and improved durability in these components.

2. Main Types & Functional Classification

Type	Functional Characteristics	Application Examples
Power Contacts	High current capacity (up to 100A), thermal resistance	Industrial machinery, EV charging stations
Signal Contacts	Low noise, impedance control	Telecom equipment, control systems
Coaxial Contacts	50/75 impedance, EMI shielding	Radar systems, test equipment
Fiber Optic Contacts	Low insertion loss, multi-channel transmission	High-speed data networks, avionics
Hybrid Contacts	Combined power/signal/data in single interface	Autonomous vehicle sensors, robotics

3. Structure & Composition

Typical construction includes:

Contact pins/sockets: Copper alloys (phosphor bronze, beryllium copper) with plating (gold, silver, tin)
Insulation housing: Thermoplastic (LCP, PBT) or thermoset materials
Shell: Aluminum, stainless steel, or composite materials
Contact retention system: Spring-loaded mechanisms for vibration resistance
Environmental seals: Elastomer gaskets for IP67+ protection

Modular designs allow mixed contact configurations with polarization keys to prevent mis-mating.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Current Rating	1-100A	Determines power transmission capability
Voltage Rating	50-1500V	Safety and insulation performance
Contact Resistance	1-15m	Signal integrity and power efficiency
Insulation Resistance	100M -10G	EI/EMC compliance
Temperature Range	-65 C to +200 C	Environmental durability
Mating Cycles	500-10,000	Service life and reliability

5. Application Fields

Aerospace: Flight control systems, in-flight entertainment
Industrial Automation: Robotics, CNC machines
Medical Equipment: MRI scanners, patient monitoring systems
Transportation: Rail signaling, automotive sensors
Defense: Radar systems, secure communications

Case Study: In wind turbines, circular connectors handle pitch control signals with IP68 protection against dust/moisture.

6. Leading Manufacturers

Manufacturer	Representative Product	Key Features
Amphenol	Series 800 Circular	High-speed data transmission up to 10Gbps
TE Connectivity	DEUTSCH DT Series	Extreme temperature resistance (-65 C to +200 C)
Molex	Circular MIL-DTL-38999	Shock/vibration rated for military vehicles
Delphi	Mini-Circular Connector	Compact design for automotive sensor networks

7. Selection Guidelines

Key considerations:

Current/voltage requirements vs. contact material properties
Environmental protection level (IP rating)
Mating/unmating force requirements
Signal integrity needs (frequency, crosstalk)
Compliance with standards (MIL-DTL-38999, IEC 61076)
Cost vs. lifecycle trade-offs

Recommendation: Aerospace applications should prioritize weight reduction with composite shells, while industrial uses need corrosion-resistant plating.

8. Industry Trends

Emerging developments include:

Micro-miniaturization for IoT device integration
High-speed contacts supporting 40+ Gbps data rates
Smart connectors with integrated sensors
Alternative plating materials (nanocoatings) for RoHS compliance
Modular hybrid designs combining power/optical contacts

Market growth driven by 5G infrastructure and electric vehicle adoption, projected CAGR of 6.8% (2023-2030).