Circular Connectors

Image Part Number Description / PDF Quantity Rfq
SD-80J

SD-80J

CUI Devices

CONN RCPT FMALE DIN 8P SOLDER

2876

MD-80SG

MD-80SG

CUI Devices

CONN RCPT FMALE MINI DIN 8P SLDR

894

SD-70J

SD-70J

CUI Devices

CONN RCPT FMALE DIN 7P SOLDER

533

MD-50J

MD-50J

CUI Devices

CONN RCPT FMALE MINI DIN 5P SLDR

1412

SD-80LP

SD-80LP

CUI Devices

CONN PLUG MALE DIN 8P SOLDER

2779

MD-60SM

MD-60SM

CUI Devices

CONN RCPT FMALE MINI DIN 6P SLDR

8398

MD-50SM

MD-50SM

CUI Devices

CONN RCPT FMALE MINI DIN 5P SLDR

2406

SD-50LP

SD-50LP

CUI Devices

CONN PLUG MALE DIN 5P SOLDER

6

MD-40SN

MD-40SN

CUI Devices

CONN RCPT FMALE MINI DIN 4P SLDR

1026

SD-60LP

SD-60LP

CUI Devices

CONN PLUG MALE DIN 6P SOLDER

575

SDR-60

SDR-60

CUI Devices

CONN PLUG MALE DIN 6P SOLDER

3829

SD-40LS

SD-40LS

CUI Devices

CONN RCPT FMALE DIN 4P SOLDER

3374

MD-40J

MD-40J

CUI Devices

CONN RCPT FMALE MINI DIN 4P SLDR

604

SDR-30

SDR-30

CUI Devices

CONN PLUG MALE DIN 3POS SOLDER

81

MD-40PL100

MD-40PL100

CUI Devices

CONN RCPT FMALE MINI DIN 4P WIRE

1475

SDF-60J

SDF-60J

CUI Devices

CONN RCPT FMALE DIN 6POS SOLDER

6921

PD-30S

PD-30S

CUI Devices

CONN JACK FMALE 3POS TIN SOLDER

7652

MD-50SG

MD-50SG

CUI Devices

CONN RCPT FMALE MINI DIN 5P SLDR

999

MD-50SMK

MD-50SMK

CUI Devices

CONN RCPT FMALE MINI DIN 5P SLDR

1047

SD-130J

SD-130J

CUI Devices

CONN RCPT FMALE DIN 13P SOLDER

202

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

TypeFunctional CharacteristicsApplication Examples
MIL-DTL-38999High-density, threaded coupling, EMI shieldingAerospace systems, military vehicles
USB Type-CReversible design, 10Gbps data rate, 100W power deliverySmartphones, laptops, PDAs
BNCBayonet locking, 2GHz frequency rangeTest equipment, video systems
LVDT CircularLinear variable differential transformer integrationIndustrial 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

ParameterTypical RangeImportance
Voltage Rating50V-600VDetermines power transmission capacity
Current Rating1A-25A/contactAffects thermal performance
Contact Resistance 5m Impacts signal integrity
IP RatingIP40-IP68Defines environmental protection level
Operating Temp-65 C to +200 CMaterial stability indicator
Mating Cycles500-10,000Service 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

ManufacturerKey ProductsSpecial Features
AmphenolMIL-DTL-38999 seriesComposite materials, EMI filtering
TE ConnectivityDEUTSCH D38999Thermoplastic housing, 2000V dielectric
MolexUSB Type-C 10GbpsShielded twinax design
DelphiAutomotive circular connectorsIP69K rating for EV charging
LemoPush-pull circular seriesSubminiature, 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

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