component
SMF4L33CA
Public Made by Adomby 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSMF4L33CA
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf4l33ca.step/smf4l33ca.glbare 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, primarycathode-band convention(convention), consensusoff(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).