component
SZSMF12AT1G
Public Made by Adomby adom
Littelfuse TVS, SOD-123F. 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
markdownSZSMF12AT1G
Littelfuse · TVS · SOD-123F
SZSMF12AT1G from Littelfuse, in a SOD-123F. 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 unidirectional TVS diode, marked by the polarity band and oriented toward the tape sprocket holes; connect to the protected positive line (VRWM 12 V for SZSMF12AT1G). |
| 2 | Anode | passive | Anode of the unidirectional TVS diode, normally connected to ground/return of the protected line. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SOD-123F |
| Category | TVS/Fuse/Board Level 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | 12 | V | 2 | |||
| Breakdown Voltage | VBR | 13.3 | 14 | 14.7 | V | @ IT = 1 mA, TA = 25°C | 2 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 2 | ||
| Maximum Clamping Voltage | VC | 19.9 | V | @ IPP | 2 | ||
| Maximum Reverse Peak Pulse Current | IPP | 10.1 | A | Surge waveform per Figure 2 | 2 | ||
| Forward Voltage | VF | 3.5 | V | IF = 12 A, TA = 25°C | 2 | ||
| Peak Power Dissipation 10/1000 µs | PPK | 200 | W | PW-10/1000 µs, non-repetitive, TA = 25°C | 1 | ||
| Peak Power Dissipation 8/20 µs | PPK | 1000 | W | TA = 25°C, PW-8/20 µs | 1 | ||
| DC Power Dissipation | PD | 385 | mW | TA = 25°C, FR-4 min pad | 1 | ||
| Power Derating above 25°C | 4 | mW/°C | Derate above 25°C | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 325 | °C/W | Mounted with recommended minimum pad, FR-4 | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 26 | °C/W | Mounted with recommended minimum pad, FR-4 | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -55 | 150 | °C | 1 | ||
| Breakdown Test Current | IT | 1 | mA | VBR measured at TA = 25°C | 2 |
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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
CAD (KiCad official)
- Symbol:
SZSMF12AT1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123F (KiCad packages3D, STEP)
- 3D model files:
szsmf12at1g-etched.step/szsmf12at1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szsmf12at1g.step/szsmf12at1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
c7f007045647a940, 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).