component

SMF4L22A

Public Made by Adom

by adom

Littelfuse TVS, SOD-123FL. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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docs Publish 0.1.0 · Ray 15d ago
viewers smf4l22a: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
package.json Publish 0.1.0 · Ray 15d ago
page.json Set visibility: public · Ray 15d ago
README.md Publish 0.1.0 · Ray 15d ago
smf4l22a-etched.glb Publish 0.1.0 · Ray 15d ago
smf4l22a-etched.step smf4l22a: factory component page (tier=lcsc) · Ray 15d ago
smf4l22a-hero.glb smf4l22a: hero GLB from the etched model (keeps the MPN mark) · Ray 15d ago
smf4l22a-hero.overlay.json Publish 0.1.0 · Ray 15d ago
smf4l22a.glb Publish 0.1.0 · Ray 15d ago
smf4l22a.kicad_mod Publish 0.1.0 · Ray 15d ago
smf4l22a.kicad_sym smf4l22a: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
smf4l22a.lbr smf4l22a: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
smf4l22a.step Publish 0.1.0 · Ray 15d ago

SMF4L22A

Littelfuse · TVS · SOD-123FL

SMF4L22A from Littelfuse, in a SOD-123FL. 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 Cathode passive Cathode of the uni-directional TVS diode (marked by the color/cathode band), connected to the protected line; SMF4L22A has VR 22 V and VBR 24.40-26.90 V at 1 mA.
2 Anode passive Anode of the uni-directional TVS diode, normally connected to ground; clamps at VC 35.5 V at Ipp 11.3 A.

Key specifications

Parameter Value
Manufacturer Littelfuse
Package SOD-123FL
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
Breakdown Voltage VBR 24.4 26.9 V @ IT = 1 mA 2
Reverse Standoff Voltage VR 22 V 2
Maximum Reverse Leakage IR 1 µA @ VR 2
Maximum Peak Pulse Current Ipp 11.3 A 10/1000µs exponential wave 2
Maximum Clamping Voltage VC 35.5 V @ Ipp 2
Test Current IT 1 mA 2
Peak Pulse Power Dissipation 10/1000µs PPPM 400 W TA=25ºC, 10/1000μs 1
Peak Pulse Power Dissipation 8/20µs PPPM 2000 W TA=25ºC, 8/20μs 1
Power Dissipation On Infinite Heat Sink PD 1 W TL=50ºC 1
Operating and Storage Temperature Range TJ,TSTG -55 150 °C 1
Thermal Resistance Junction to Ambient RƟJA 220 °C/W 1
Thermal Resistance Junction to Lead RƟJL 100 °C/W 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin • Matte tin lead-free plated • Halogen-free and RoHS 1

CAD (KiCad official)

  • Symbol: SMF4L22A
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123FL (KiCad packages3D, STEP)
  • 3D model files: smf4l22a-etched.step / smf4l22a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smf4l22a.step / smf4l22a.glb are the bare package body.

Provenance

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

  • Datasheet: Littelfuse datasheet (6 pp, sha256 7971ab636790fc84, 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