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ESD56181W04-2

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WILLSEMI Will Semicon ESD And Surge Protection (TVS/ESD), SOD-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ESD56181W04-2

WILLSEMI Will Semicon · ESD And Surge Protection (TVS/ESD) · SOD-323

ESD56181W04-2 from WILLSEMI Will Semicon, in a SOD-323. 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 Pin1 passive Unidirectional TVS terminal (cathode side of the circuit diagram) for the 4.5V reverse stand-off device (VRWM 4.5V, VBR 5.2-6.2V at 1mA), protecting a power line; datasheet measures electrical characteristics from pin 1 to pin 2.
2 Pin2 passive Unidirectional TVS terminal (anode side of the circuit diagram) for the 4.5V reverse stand-off device, rated for 1800W peak pulse power (8/20us) and ±30kV IEC61000-4-2 ESD, used as the return/ground side of the protected line.

Key specifications

Parameter Value
Manufacturer WILLSEMI Will Semicon
Package SOD-323
Category Circuit Protection
Pins 2

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Peak pulse power Ppk 1800 W tp = 8/20μs 2
ESD air discharge VESD -30 30 kV IEC61000-4-2 air discharge 2
ESD contact discharge VESD -30 30 kV IEC61000-4-2 contact discharge 2
Junction temperature TJ 125 °C 2
Operating temperature TOP -40 85 °C 2
Lead temperature TL 260 °C 2
Storage temperature TSTG -55 150 °C 2
Reverse stand-off voltage VRWM 4.5 V TA = 25°C 3
Breakdown voltage VBR 5.2 5.7 6.2 V IBR = 1mA 3
Reverse leakage current IRM 2 μA at VRWM 3
Forward voltage VF 0.6 1.1 V IF = 20mA 3
Junction capacitance Cj 1100 1200 pF F = 1MHz, VR=0V 3
Rated peak pulse current IPP 110 A 8/20μs, non-repetitive, IEC61000-4-5 3
Clamping voltage VCL 12.5 15 V at IPP, non-repetitive current pulse 3

CAD (KiCad official)

  • Symbol: ESD56181W04-2
  • Footprint: Diode_SMD:D_SOD-323
  • 3D model: SOD-323 (KiCad packages3D, STEP)
  • 3D model files: esd56181w04-2-etched.step / esd56181w04-2-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); esd56181w04-2.step / esd56181w04-2.glb are the bare package body.

Provenance

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

  • Datasheet: WILLSEMI Will Semicon datasheet (6 pp, sha256 9e4b9602fac075e5, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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