USL Series

USL Series

0.4 mm Pitch, Insulation-displacement connector (IDC)

The USL series is a 0.4 mm pitch connector for micro coaxial cables (AWG#42). Bulk connection by pressure welding improves the connection reliability and makes the connector compact.

Mating List

Product List

Product List & Technical Data (CAD files)

Key Features


Bulk pressure welding improves connection reliability and contributes to miniaturization of devices.

  • 0.4 mm pitch, 1.0 mm mated height, and 5.6 mm mating width
  • Board side connector is right-angle type; cable side connector is straight type.
  • Effective mating length is 0.5 mm.
  • Available in 20, 30, and 40 positions
  • Lead-free product
Improved Product Strength, Transmission Characteristics, Noise Reduction

Improved Product Strength, Transmission Characteristics, Noise Reduction

  • The board-side connector is surrounded by a metal shell to improve noise reduction, product strength, and to strengthen the grounding.
  • Ground terminals are provided at multiple points to improve transmission and EMS characteristics.


Insulator MaterialLCP (glass fiber-filled) UL94V-0 material, black
Contact MaterialCopper alloy
Contact FinishNickel-plated base, gold-plated finish
Shell MaterialCopper alloy
Shell FinishNickel-plated base, tin-copper plated finish
Cover Material[USL20] LCP (with glass fiber) UL94V-0 material, white
Rated Current0.25 A per contact
Contact Resistance100 mΩ or less
Withstand Voltage200 V AC, 1 minute
Insulation Resistance250 V DC, 100 mΩ min.
Operating Temperature Range-40 to +85°C
Applicable CableAWG#42 micro coaxial cable

Product List & Technical Data

Scroll horizontally to view all table content.

Part numberCurrent ratingPitchNo. of contactsTypeConnection typeRecommended cableNo. of packagingPackaging styleRoHSOther featuresProduct drawingSpecification3D-CAD
USL00-20L-A0.25 A0.4 mm20Receptacle (PCB side)Horizontal500Embossed tapeCompliantViewViewDownloadDownload
USL00-20L-B0.25 A0.4 mm20Receptacle (PCB side)Horizontal1,000Embossed tapeCompliantViewViewDownloadDownload
USL00-20L-C0.25 A0.4 mm20Receptacle (PCB side)Horizontal3,000Embossed tapeCompliantViewViewDownloadDownload
USL00-30L-A0.25 A0.4 mm30Receptacle (PCB side)Horizontal500Embossed tapeCompliantViewViewDownloadDownload
USL00-30L-B0.25 A0.4 mm30Receptacle (PCB side)Horizontal1,000Embossed tapeCompliantViewViewDownloadDownload
USL00-30L-C0.25 A0.4 mm30Receptacle (PCB side)Horizontal3,000Embossed tapeCompliantViewViewDownloadDownload
USL00-40L-A0.25 A0.4 mm40Receptacle (PCB side)Horizontal500Embossed tapeCompliantViewViewDownloadDownload
USL00-40L-B0.25 A0.4 mm40Receptacle (PCB side)Horizontal1,000Embossed tapeCompliantViewViewDownloadDownload
USL00-40L-C0.25 A0.4 mm40Receptacle (PCB side)Horizontal3,000Embossed tapeCompliantViewViewDownloadDownload
USL20-20S0.25 A0.4 mm20Plug (Cable side)HorizontalAWG#423,000OtherCompliantCable connection: IDCViewViewDownloadDownload
USL20-30S0.25 A0.4 mm30Plug (Cable side)HorizontalAWG#423,000OtherCompliantCable connection: IDCViewViewDownloadDownload
USL20-40S0.25 A0.4 mm40Plug (Cable side)HorizontalAWG#423,000OtherCompliantCable connection: IDCViewViewDownloadDownload

Standards, Compliance, and Test Results

Standard Name

Download Transmission Characteristics Data

To download Transmission Characteristics Data, complete the form below and press the “Send & Download” button.

Case Studies


With current FPC, noise interruption will occur, and if counter measures are taken, flexibility of FPC is lost and complicates internal wiring, which leads to defects during assembly.


The USL series metal shell and multiple ground contacts reduced the micro coaxial cables’ noise, flexibility, and bendability and enabled easy wiring within the device.


Flexible Customization & Consultation

Flexible Customization & Consultation

Renowned for industry-leading expertise in floating connectors, we can assist you through the entire process of creating custom solutions. We have many years of experience in connector peripheral development, design, and manufacturing.

Top-Quality Products Made in Japan

Top-Quality Products Made in Japan

A fully automated production line for floating connectors is now in operation with a Class 100,000 cleanroom at our plant located in Japan’s Yamanashi Prefecture.

ISO & IATF Certified

ISO & IATF Certified

We are ISO9001/14001 and IATF16949 certified and registered.

Custom Solutions

Custom Solutions

With technology cultivated over 60 years, we pursue miniature, reliable and high functionality

Transmission Simulation

Transmission Simulation Data

Our development department can replicate similar customer conditions and provide you with accurate simulation data.

Custom Harness Support

Custom Harness Support

KEL develops custom-made harnesses to meet your specifications.