Circular Connectors

Image	Part Number	Description / PDF	Quantity	Rfq
	D38999/26FG16SN Amphenol Aerospace Operations	CONN PLUG FMALE 16POS GOLD CRIMP	0
	MS27484T18B35PB Amphenol Aerospace Operations	CONN PLUG MALE 66POS GOLD CRIMP	0
	MS27473T14F97S Amphenol Aerospace Operations	CONN PLUG FMALE 12POS GOLD CRIMP	0
	D38999/24WD5PC Amphenol Aerospace Operations	CONN RCPT MALE 5POS GOLD CRIMP	0
	MS3456L18-1SX Amphenol Aerospace Operations	CONN PLUG FMALE 10POS GOLD CRIMP	0
	MS3476L14-5SY Amphenol Aerospace Operations	CONN PLUG FMALE 5POS GOLD CRIMP	0
	D38999/20FG16PN Amphenol Aerospace Operations	CONN RCPT MALE 16POS GOLD CRIMP	0
	MS3471W14-4PW Amphenol Aerospace Operations	CONN RCPT MALE 4POS GOLD CRIMP	0
	M83723/85R1412N Amphenol Aerospace Operations	CONN RCPT MALE 12POS GOLD CRIMP	0
	MS3474W20-39SY Amphenol Aerospace Operations	CONN RCPT FMALE 39POS GOLD CRIMP	0
	MS27473T16F26PA Amphenol Aerospace Operations	CONN PLUG MALE 26POS GOLD CRIMP	0
	MS27466T11B5SA Amphenol Aerospace Operations	CONN RCPT FMALE 5POS GOLD CRIMP	0
	D38999/26FJ11SN Amphenol Aerospace Operations	CONN PLUG FMALE 11POS CRIMP	0
	M83723/83R2255N Amphenol Aerospace Operations	CONN RCPT MALE 55POS GOLD CRIMP	0
	M83723/96G2212N Amphenol Aerospace Operations	CONN PLUG MALE 12POS GOLD CRIMP	0
	D38999/20WA98PB Amphenol Aerospace Operations	CONN RCPT MALE 3POS GOLD CRIMP	0
	MS27472T10B99P Amphenol Aerospace Operations	CONN RCPT MALE 7POS GOLD CRIMP	0
	MS3472W18-8SW Amphenol Aerospace Operations	CONN RCPT FMALE 8POS GOLD CRIMP	0
	MS3470W22-41SW Amphenol Aerospace Operations	CONN RCPT FMALE 41POS GOLD CRIMP	0
	MS27508E18B11SA Amphenol Aerospace Operations	CONN RCPT FMALE 11POS GOLD CRIMP	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