component

SMF4L33CA

Public Made by Adom

by adom

Littelfuse ESD And Surge Protection (TVS/ESD), SOD-123FL. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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SMF4L33CA

Littelfuse · ESD And Surge Protection (TVS/ESD) · SOD-123FL

SMF4L33CA 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 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

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 (bi-directional) - minimum VBR 36.7 V IT = 1 mA; VBR measured after IT applied for 300µs (Note 1) 2
Breakdown Voltage VBR (bi-directional) - maximum VBR 40.6 V IT = 1 mA; VBR measured after IT applied for 300µs (Note 1) 2
Maximum Reverse Leakage Current IR 1 µA at VR = 33 V 2
Maximum Peak Pulse Current Ipp 7.5 A 10/1000µs surge waveform (Note 2) 2
Maximum Clamping Voltage @Ipp VC 53.3 V @ Ipp, 10/1000µs surge waveform (Note 2) 2
Reverse Stand-off Voltage VR 33 V 2
Peak Pulse Power Dissipation at TA=25ºC, 8/20µs (Note 2) PPPM 2000 W 8/20µs, TA=25ºC; non-repetitive per Fig. 4, derated above TJ=25ºC per Fig. 3 (Note 1) 1
Peak Pulse Power Dissipation at TA=25ºC, 10/1000µs (Note 3) PPPM 400 W 10/1000µs, TA=25ºC; non-repetitive per Fig. 4, derated above TJ=25ºC per Fig. 3 (Note 1) 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 RθJA 220 °C/W 1
Thermal Resistance Junction to Lead RθJL 100 °C/W 1

CAD (KiCad official)

  • Symbol: SMF4L33CA
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123FL (KiCad packages3D, STEP)
  • 3D model files: smf4l33ca-etched.step / smf4l33ca-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smf4l33ca.step / smf4l33ca.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 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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