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SZ1SMB12CAT3G
Public Made by Adomby adom
Littelfuse TVS, SMB. 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
markdownSZ1SMB12CAT3G
Littelfuse · TVS · SMB
SZ1SMB12CAT3G from Littelfuse, in a SMB. 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 | 1 | passive | Bi-directional TVS terminal with no polarity (12 V VRWM, 13.3-14.7 V breakdown at 1.0 mA, 19.9 V max clamp at 30.2 A IPP), so it can be connected to either the protected line or return. |
| 2 | 2 | passive | Second bi-directional TVS terminal with no polarity (12 V VRWM, 5.0 µA max leakage at VRWM, 600 W peak power at 10/1000 µs), so it can be connected to either the protected line or return. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMB |
| 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | 12 | V | 4 | |||
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM | 4 | ||
| Breakdown Voltage | VBR | 13.3 | 14 | 14.7 | V | @ IT = 1.0 mA, TA = 25°C | 4 |
| Clamping Voltage | VC | 19.9 | V | @ IPP = 30.2 A | 4 | ||
| Maximum Reverse Peak Pulse Current | IPP | 30.2 | A | 4 | |||
| Peak Power Dissipation | PPK | 600 | W | TL = 25°C, Pulse Width = 1 ms, 10/1000 µs non-repetitive | 1 | ||
| DC Power Dissipation (zero lead length) | PD | 3 | W | TL = 75°C, 1" square copper pad, FR-4 board | 1 | ||
| DC Power Dissipation (FR-4 board) | PD | 0.55 | W | TA = 25°C, minimum recommended footprint | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 25 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 226 | °C/W | FR-4 board, minimum recommended footprint | 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 | and the terminal finish material is tin(Sn) (IPC/ | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMB12CAT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb12cat3g-etched.step/sz1smb12cat3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb12cat3g.step/sz1smb12cat3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
b867ff8d1ae59140, retrieved 2026-10-31, 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).