component
SMF4L20A
Public Made by Adomby adom
Littelfuse TVS, SOD-123FL. Pinout cross-checked by two models against the datasheet, 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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Contents
README
markdownSMF4L20A
Littelfuse · TVS · SOD-123FL
SMF4L20A 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 of the uni-directional TVS diode, marked by the color band on the package; standoff voltage VR 20 V, breakdown 22.20-24.50 V at 1 mA, clamping 32.4 V at 12.3 A Ipp. |
| 2 | A | passive | Anode of the uni-directional TVS diode, connected to the protected circuit return or ground; 400 W peak pulse power at 10/1000µs. |
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 | 22.2 | 24.5 | V | @ IT = 1 mA | 2 | |
| Test Current | IT | 1 | mA | 2 | |||
| Reverse Stand-off Voltage | VR | 20 | V | 2 | |||
| Maximum Reverse Leakage | IR | 1 | µA | @ VR | 2 | ||
| Maximum Peak Pulse Current | Ipp | 12.3 | A | 10/1000µs exponential wave | 2 | ||
| Maximum Clamping Voltage | VC | 32.4 | V | @ Ipp | 2 | ||
| Breakdown Voltage Tolerance | -5 | 5 | % | VBR voltage tolerance per part numbering system | 6 | ||
| Peak Pulse Power Dissipation 8/20µs | PPPM | 2000 | W | TA=25ºC, 8/20µs | 1 | ||
| Peak Pulse Power Dissipation 10/1000µs | PPPM | 400 | W | TA=25ºC, 10/1000µs | 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:
SMF4L20A - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files:
smf4l20a-etched.step/smf4l20a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf4l20a.step/smf4l20a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
7971ab636790fc84, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).