Circular Connectors

Image Part Number Description / PDF Quantity Rfq
21572122407

21572122407

HARTING

CIRCULAR CONNECTOR W HARAX M12

0

21011301013

21011301013

HARTING

CONN PNL FEED THRU 3POS GOLD QC

0

21033111815

21033111815

HARTING

CONN RCPT MALE 8POS SOLDER

0

21033821400

21033821400

HARTING

CONN RCPT MALE 4POS GOLD IDC

7

21033214201

21033214201

HARTING

CONN RCPT FMALE 12POS SOLDER

10

21572121407

21572121407

HARTING

CIRCULAR CONNECTOR W HARAX M12

0

20820052001

20820052001

HARTING

CONN JACK FMALE 4POS GOLD IDC

0

21033222401

21033222401

HARTING

CONN PLUG FMALE 4POS GOLD IDC

15

21052811405

21052811405

HARTING

QCS CIRCULAR CONNECTOR W HARAX

0

21090030213

21090030213

HARTING

CONN TERM SET HARAX MALE M12

0

21033412530

21033412530

HARTING

PCB RECEPTACLE FEMALE BACK B-COD

0

21033411530

21033411530

HARTING

PCB RECEPTACLE MALE BACK B-COD 5

0

21033814416

21033814416

HARTING

CONN M12 PNL FEED THRU PCB ANGLE

0

21031711405

21031711405

HARTING

CIRCULAR CONNECTOR WITH HARAX M

0

21090030214

21090030214

HARTING

CONN TERM SET HARAX MALE M8

0

21033111515

21033111515

HARTING

CONN RCPT MALE 5POS SOLDER

0

21033221401

21033221401

HARTING

CONN PLUG MALE 4POS GOLD IDC

6

21033411531

21033411531

HARTING

PCB RECEPTACLE MALE FRONT B-COD

0

21033814437

21033814437

HARTING

CONN RCPT FMALE 4POS GOLD SOLDER

0

21420000006

21420000006

HARTING

CONN INSERT FMALE 4POS SOLDER

69

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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