Circular Connectors

Circular Connectors - Contacts

Part Number	Description / PDF	Quantity
21-033909-028 Amphenol Aerospace Operations	CONTACT PIN SZ 12 CRIMP GOLD	0
T3-47TB08-LD Amphenol Aerospace Operations	CONTACT SOCKET SZ 8 CRIMP GOLD	0
21-033729-011 Amphenol Aerospace Operations	CONTACT SOCKET COAX SZ12 CRIMP	837
2M809-118 Amphenol Aerospace Operations	CONTACT PIN SZ 12 CRIMP GOLD	1233
ZZL-4116-10P Amphenol Aerospace Operations	CONTACT SOCKET 16-20AWG CRIMP	0
10-497699-045 Amphenol Aerospace Operations	CONTACT SOCKET SZ 22D PCB	0
21-033190-022 Amphenol Aerospace Operations	CONTACT PIN SZ 8 CRIMP GOLD	0
BACC47EX2 Amphenol Aerospace Operations	CONTACT PIN BACC SHIELDED 2	0
21-033651-018 Amphenol Aerospace Operations	CONTACT PIN COAX SZ 12 CRIMP	0
10-497650-045 Amphenol Aerospace Operations	CONTACT SOCKET SZ 16 PCB	0
21-033122-564 Amphenol Aerospace Operations	CONTACT PIN COAX SZ 16 CRIMP	0
21-033586-001 Amphenol Aerospace Operations	CONTACT SOCKET 38999 III OCS	0
10-497649-075 Amphenol Aerospace Operations	CONTACT SOCKET SZ 16 PCB	0
ZZL-4120-10R Amphenol Aerospace Operations	CONTACT SOCKET 20-24AWG CRIMP	0
21-033102-027 Amphenol Aerospace Operations	CONTACT PIN COAX SZ 8 CRIMP	0
21-033191-071 Amphenol Aerospace Operations	CONTACT SOCKET SZ 8 CRIMP GOLD	0
10-597981-095 Amphenol Aerospace Operations	CONTACT 2M SZ 23 PCB STRT .945	0
T3-4122-10P Amphenol Aerospace Operations	CONTACT SOCKET 22-28AWG CRIMP	0
5M2251-002S Amphenol Aerospace Operations	CONTACT SOCKET SZ 8 TRIAX	0
21-033909-025 Amphenol Aerospace Operations	CONTACT PIN SZ 12 CRIMP GOLD	50

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).