Circular Connectors

Part Number	Description / PDF	Quantity
M12T-04PMMS-SF8B15 LTW (Amphenol LTW)	CONN PLUG MALE 4P WIR LEAD 0.49'	0
ACD-08PMFS-LC7001 LTW (Amphenol LTW)	CONN RCPT FMALE 8P GOLD SLDR CUP	113
PWMU-04RMFS-TS7001 LTW (Amphenol LTW)	CONN RCPT FMALE 4POS SOLDER	69
BD-05BFFA-LL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 5P GOLD SLDR CUP	130
M12A-12PMMS-SH8001 LTW (Amphenol LTW)	CONN PLUG MALE 12P GOLD SLDR CUP	9
CD-14PMMP-LC7001 LTW (Amphenol LTW)	CONN RCPT MALE 14POS GOLD SOLDER	0
CU-18BFFA-LL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 18P SOLDER CUP	0
BD-08BMMA-LL7001 LTW (Amphenol LTW)	CONN RCPT MALE 8P GOLD SLDR CUP	48
MSAS-04PFFT-EE0001 LTW (Amphenol LTW)	CONN FMALE INSERT 4P GOLD SOLDER	100
MSDS-04BFFC-SL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 4POS CRIMP	15
FLKC-14FGMS-GCP-213 LTW (Amphenol LTW)	CONN PLUG MALE 14P GOLD SLDR CUP	19
FLKC-10FGMS-GCP-213 LTW (Amphenol LTW)	CONN PLUG MALE 10P GOLD SLDR CUP	24
AD-02BMMA-LL7001 LTW (Amphenol LTW)	CONN RCPT MALE 2P GOLD SLDR CUP	45
M12S-04BFFB-SL7002 LTW (Amphenol LTW)	CONN RCPT FMALE 4POS GOLD SCREW	0
CD-14BFFA-LL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 14P SOLDER CUP	0
BD-03BMMA-LL7001 LTW (Amphenol LTW)	CONN RCPT MALE 3P GOLD SLDR CUP	26
AU-05BFFA-LL7001 LTW (Amphenol LTW)	CONN PLUG FMALE 5P GOLD SLDR CUP	27
CD-08PMMS-QC8001 LTW (Amphenol LTW)	CONN RCPT MALE 8P GOLD SLDR CUP	0
Q8DU-05PMMS-QF8001 LTW (Amphenol LTW)	CONN RCPT MALE 5P GOLD SLDR CUP	0
M12A-12BFFA-SL7001 LTW (Amphenol LTW)	CONN RCPT FMALE 12P SOLDER CUP	13

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