component
SMF4L12A
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
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownSMF4L12A
Littelfuse · ESD And Surge Protection (TVS/ESD) · SOD-123FL
SMF4L12A 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 (uni-directional, SMF4L12A) | VBR | 13.3 | 14.7 | V | @ IT = 1 mA; VBR measured after IT applied for 300µs | 2 | |
| Maximum Reverse Leakage | IR | 1 | µA | @ VR = 12 V | 2 | ||
| Maximum Peak Pulse Current | Ipp | 20.1 | A | 10/1000µs surge waveform | 2 | ||
| Maximum Clamping Voltage | VC | 19.9 | V | @ Ipp = 20.1 A | 2 | ||
| Peak Pulse Power Dissipation | PPPM | 2000 | W | 8/20µs (Note 2) | 1 | ||
| Peak Pulse Power Dissipation | PPPM | 400 | W | 10/1000µs (Note 3) | 1 | ||
| Power Dissipation on Infinite Heat Sink | PD | 1 | W | TL = 50ºC | 1 | ||
| Operating and Storage Temperature Range | TJ,TSTG | -55 | 150 | °C | Operating and storage | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 220 | °C/W | Junction to ambient; printed as a single value, no min/max designation | 1 | ||
| Thermal Resistance Junction to Lead | RθJL | 100 | °C/W | Junction to lead; printed as a single value, no min/max designation | 1 |
CAD (KiCad official)
- Symbol:
SMF4L12A - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files:
smf4l12a-etched.step/smf4l12a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf4l12a.step/smf4l12a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
7971ab636790fc84, retrieved 2026-10-13, 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).