Circular Connectors

Part Number	Description / PDF	Quantity
12-03BMMA-SL8001 LTW (Amphenol LTW)	CONN PLUG MALE 3P GOLD SLDR CUP	53
M12T-04PFFS-SH8B15 LTW (Amphenol LTW)	CONN RCPT FMAL 4P WIR LEAD 0.49'	0
CC-02BFFB-QL8APP LTW (Amphenol LTW)	CONN PLUG FMALE 2POS GOLD SCREW	57
BD-03PMMS-QC8001 LTW (Amphenol LTW)	CONN RCPT MALE 3P GOLD SLDR CUP	0
M12A-08PMMP-SF8002 LTW (Amphenol LTW)	CONN PLUG MALE 8POS GOLD SOLDER	0
M12T-04BFFB-SL7002 LTW (Amphenol LTW)	CONN RCPT FMALE 4POS GOLD SCREW	0
BD-02BFFA-LL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 2P GOLD SLDR CUP	25
FLKC-02EGFS-GCP-001 LTW (Amphenol LTW)	CONN RCPT FMALE 2P GOLD SLDR CUP	11
BD-05BFFA-SL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 5P GOLD SLDR CUP	43
AU-06PMMP-QC8001 LTW (Amphenol LTW)	CONN RCPT MALE 6POS GOLD SOLDER	46
PWF-03BFFA-SL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 3P GOLD SLDR CUP	820
BB-02RMMS-QC8001 LTW (Amphenol LTW)	CONN RCPT MALE 2P GOLD SLDR CUP	45
FLKC-10EGFS-GCP-001 LTW (Amphenol LTW)	CONN RCPT FMALE 10P SOLDER CUP	25
FLKD-07FGMS-GCP-215 LTW (Amphenol LTW)	CONN PLUG MALE 7P GOLD SLDR CUP	24
BD-04BFMA-LL7001 LTW (Amphenol LTW)	CONN PLUG MALE 4P GOLD SLDR CUP	0
CD-07BFMA-SL7001 LTW (Amphenol LTW)	CONN PLUG MALE 7P GOLD SLDR CUP	0
BD-02RMFS-QC8001 LTW (Amphenol LTW)	CONN RCPT FMALE 2P GOLD SLDR CUP	29
M12T-04PMMS-SH8B15 LTW (Amphenol LTW)	CONN PLUG MALE 4P WIR LEAD 0.49'	0
CD-12BFFA-QL8SP0 LTW (Amphenol LTW)	CONN PLUG FMALE 12POS GOLD CRIMP	0
CC-03PMMP-LC7001 LTW (Amphenol LTW)	CONN RCPT MALE 3POS GOLD SOLDER	45

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