Circular Connectors

Part Number	Description / PDF	Quantity
D38999/20MG35PN Amphenol Aerospace Operations	CONN RCPT MALE 79POS GOLD CRIMP	0
D38999/24WB35PN Amphenol Aerospace Operations	CONN RCPT MALE 13POS GOLD CRIMP	252
D38999/20ZC8PN Amphenol Aerospace Operations	CONN RCPT MALE 8POS GOLD CRIMP	27
D38999/26FD97SB Amphenol Aerospace Operations	CONN PLUG FMALE 12POS GOLD CRIMP	0
D38999/20FA98PB Amphenol Aerospace Operations	CONN RCPT MALE 3POS GOLD CRIMP	0
MS27484T18B32SA Amphenol Aerospace Operations	CONN PLUG FMALE 32POS GOLD CRIMP	0
MS27467T25B35P Amphenol Aerospace Operations	CONN PLUG MALE 128POS GOLD CRIMP	0
M83723/72W1831N Amphenol Aerospace Operations	CONN RCPT MALE 31POS GOLD CRIMP	0
MS3450L32-7P Amphenol Aerospace Operations	CONN RCPT MALE 35POS GOLD CRIMP	0
D38999/20WJ8PA Amphenol Aerospace Operations	CONN RCPT MALE 8POS GOLD CRIMP	0
D38999/26FG11PN Amphenol Aerospace Operations	CONN PLUG MALE 11POS GOLD CRIMP	0
D38999/24ZF35PN Amphenol Aerospace Operations	CONN RCPT MALE 66POS GOLD CRIMP	1
MS3472W20-16SY Amphenol Aerospace Operations	CONN RCPT FMALE 16POS GOLD CRIMP	0
D38999/20KH21SA Amphenol Aerospace Operations	CONN RCPT FMALE 21POS GOLD CRIMP	0
D38999/24FE8PA Amphenol Aerospace Operations	CONN RCPT MALE 8POS GOLD CRIMP	0
MS27466T9B98SA Amphenol Aerospace Operations	CONN RCPT FMALE 3POS GOLD CRIMP	0
MS3476L12-10PX Amphenol Aerospace Operations	CONN PLUG MALE 10POS GOLD CRIMP	0
D38999/20WA98SC Amphenol Aerospace Operations	CONN RCPT FMALE 3POS GOLD CRIMP	0
MS27466T19B35S Amphenol Aerospace Operations	CONN RCPT FMALE 66POS GOLD CRIMP	0
MS27473T12F98PB Amphenol Aerospace Operations	CONN PLUG MALE 10POS 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