component
SZ1SMA12AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), SMA. 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
markdownSZ1SMA12AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMA
SZ1SMA12AT3G from Littelfuse, in a SMA. 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 terminal of the uni-directional TVS; the color band marks the cathode on unidirectional parts. |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, opposite the cathode band marking. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMA |
| 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 | 13.3 | 14 | 14.7 | V | IT = 1 mA | 3 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 3 | ||
| Clamping Voltage | VC | 19.9 | V | IPP = 20.1 A | 3 | ||
| Typical Junction Capacitance | C | 925 | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C (Note 9) | 3 | ||
| Forward Voltage | VF | 3.5 | V | IF = 30 A (Note 5) | 2 | ||
| Peak Peak Power Dissipation | PPK | 400 | W | TL = 25°C, Pulse Width = 1 ms (Note 1) | 1 | ||
| DC Power Dissipation at Lead | PD | 1.5 | W | TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| Derating Above 75°C at Lead | PD | 20 | mW/°C | Derate above TL = 75°C (Note 2) | 1 | ||
| DC Power Dissipation at Ambient | PD | 0.5 | W | TA = 25°C (Note 3) | 1 | ||
| Derating Above 25°C at Ambient | PD | 4 | mW/°C | Derate above TA = 25°C (Note 3) | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 50 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| Thermal Resistance Junction-to-Ambient | RθJA | 120 | °C/W | Note 3 | 1 | ||
| Forward Surge Current | IFSM | 40 | A | TA = 25°C, 1/2 sine wave PW = 8.3 ms (Note 4), for uni-directional | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 175 | °C | 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 | the terminal finish material is tin(Sn) (IPC/JEDEC J-STD609A.01) | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMA12AT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma12at3g-etched.step/sz1sma12at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma12at3g.step/sz1sma12at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
28d8bdc1607bd94e, retrieved 2026-10-26, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusoff(skipped (clean text read)), 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).