component

CD143A-SR05

Public Made by Adom

by adom

BOURNS ESD And Surge Protection (TVS/ESD), SOT-143. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CD143A-SR05

BOURNS · ESD And Surge Protection (TVS/ESD) · SOT-143

CD143A-SR05 from BOURNS, in a SOT-143. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GND power_in Ground reference pin; the datasheet states clamping voltage is measured from Pin 4 to Pin 1 and that GND is connected to ground.
2 I/O bidirectional Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz.
3 I/O bidirectional Protected data line, with steering diodes to GND (Pin 1) and to REF/+VCC (Pin 4); capacitance is 10 pF maximum per data line at 0 V, 1 MHz.
4 REF power_in Connected to +VCC; the working peak voltage is 5.0 V for CD143A-SR05 and the clamping voltage is referenced from this pin to Pin 1.

Key specifications

Parameter Value
Manufacturer BOURNS
Package SOT-143
Category Circuit Protection
Pins 4

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Breakdown Voltage Minimum VBR 6 V @ 1 mA; from Pin 4 to Pin 1 1
Clamping Voltage Maximum VC 9.8 V @ IP = 1 A; from Pin 4 to Pin 1 1
Clamping Voltage Maximum VC 20 V @ 28 A 1
Leakage Current ID 5 µA @ VWM 1
Capacitance Maximum per Data Line CJ 10 pF @ 0 V, 1 MHz 1
Peak Pulse Power PPP 500 W tp= 8/20 µs 1
Peak Pulse Current (-SR05) IPP 30 A tp= 8/20 µs; -SR05 variant 1
Forward Voltage VF 1.5 V If = 1 A 8/20 µs 1
Operating Temperature TJ -55 150 °C 1
Storage Temperature TSTG -55 150 °C 1

CAD (KiCad official)

  • Symbol: CD143A-SR05
  • Footprint: Package_TO_SOT_SMD:SOT-143
  • 3D model: SOT-143 (KiCad packages3D, STEP)
  • 3D model files: cd143a-sr05-etched.step / cd143a-sr05-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cd143a-sr05.step / cd143a-sr05.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: BOURNS datasheet (5 pp, sha256 64b38a856f90bed8, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF