Circular Connectors

Image	Part Number	Description / PDF	Quantity	Rfq
	42-01005 CONEC	CONN PLUG MALE 3P GOLD SLDR CUP	0
	43-01202 CONEC	CONN PLUG FMALE 5POS GOLD SOLDER	0
	43-01208 CONEC	CONN RCPT MALE 4POS GOLD SOLDER	0
	42-00034 CONEC	CONN PLUG FMALE 3POS GOLD SCREW	0
	42-01009 CONEC	CONN RCPT MALE 4P GOLD SLDR CUP	0
	41-40043 CONEC	CONN RCPT MALE 4POS GOLD SOLDER	0
	41-01488 CONEC	CONN FML 4POS TO MALE 4POS	0
	43-00128 CONEC	CONN PLUG FMALE 8POS GOLD SCREW	0
	43-01224 CONEC	CONN PLUG FMALE 4POS GOLD SOLDER	0
	43-01123 CONEC	CONN PLUG FMALE 4POS GOLD SOLDER	0
	42-01038 CONEC	CONN RCPT FMALE 4POS GOLD SOLDER	0
	43-01196 CONEC	CONN PLUG FMALE 4POS GOLD SOLDER	0
	43-02079 CONEC	CONN FEMALE M12	0
	43-02080 CONEC	CONN MALE M12X1 FRONT MNT	0
	42-00028 CONEC	CONN PLUG FMALE 4POS GOLD SCREW	0
	43-01068 CONEC	CONN MALE M12X1 BACK MNT	0
	43-01252 CONEC	CONN RCPT MALE 4POS GOLD SOLDER	0
	43-00079 CONEC	CONN RCPT MALE 4POS GOLD SCREW	0
	41-51041 CONEC	CONN FML 3POS	0
	42-01014 CONEC	CONN RCPT MALE 4POS GOLD SOLDER	0

Circular Connectors

1. Overview

Circular connectors are multi-pin electrical connectors with circular contact arrangements, designed for reliable signal/power transmission in harsh environments. They feature robust mechanical structures, environmental sealing, and high mating durability. These connectors are critical in aerospace, industrial automation, and medical equipment where vibration resistance and signal integrity are paramount.

2. Main Types & Functional Classification

Type	Functional Characteristics	Application Examples
MIL-DTL-38999	High-density, threaded coupling, EMI shielding	Aerospace systems, military vehicles
USB Type-C	Reversible design, 10Gbps data rate, 100W power delivery	Smartphones, laptops, PDAs
BNC	Bayonet locking, 2GHz frequency range	Test equipment, video systems
LVDT Circular	Linear variable differential transformer integration	Industrial sensors, robotics

3. Structure & Components

Typical construction includes: - Shell: Aluminum alloy/zinc die-cast housing with corrosion-resistant plating - Contacts: Gold-plated phosphor bronze with 0.5-2.0mm diameter - Insulation: High-temperature thermoplastic (200 C rating) - Sealing: IP67/IP68 rated elastomer gaskets - Mounting: Threaded/flange/clamp mechanisms

4. Key Technical Parameters

Parameter	Typical Range	Importance
Voltage Rating	50V-600V	Determines power transmission capacity
Current Rating	1A-25A/contact	Affects thermal performance
Contact Resistance	5m	Impacts signal integrity
IP Rating	IP40-IP68	Defines environmental protection level
Operating Temp	-65 C to +200 C	Material stability indicator
Mating Cycles	500-10,000	Service life predictor

5. Application Fields

Aerospace: Flight control systems, satellite antennas
Industrial: CNC machines, automated guided vehicles
Medical: MRI scanners, patient monitoring systems
Telecom: 5G base stations, fiber optic networks
Consumer: VR headsets, gaming peripherals

6. Leading Manufacturers

Manufacturer	Key Products	Special Features
Amphenol	MIL-DTL-38999 series	Composite materials, EMI filtering
TE Connectivity	DEUTSCH D38999	Thermoplastic housing, 2000V dielectric
Molex	USB Type-C 10Gbps	Shielded twinax design
Delphi	Automotive circular connectors	IP69K rating for EV charging
Lemo	Push-pull circular series	Subminiature, 5000+ mating cycles

7. Selection Guidelines

Key considerations: 1. Environmental factors: Temperature extremes, fluid exposure 2. Electrical requirements: Signal type (analog/digital), current load 3. Mechanical constraints: Panel space, mating force limitations 4. Compliance standards: MIL-STD, ISO 6722, RoHS 5. Cost vs. longevity: High-cycle applications justify premium connectors

8. Industry Trends

Emerging developments include: - Miniaturization: 1.0mm contact pitch enabling wearable devices - High-speed transmission: 25Gbps+ differential pairs for industrial IoT - Smart connectors: Integrated sensors for condition monitoring - Material innovation: Graphene-coated contacts reducing resistance - Eco-design: Halogen-free thermoplastics meeting REACH regulations