component
SMAJ12A-TR
Public Made by Adomby adom
STMicroelectronics TVS, SMA(DO-214AC). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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|---|---|
| docs | 10d ago |
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| page.json | 10d ago |
| README.md | 10d ago |
| smaj12a-tr-etched.glb | 10d ago |
| smaj12a-tr-etched.step | 10d ago |
| smaj12a-tr-hero.glb | 10d ago |
| smaj12a-tr-hero.overlay.json | 10d ago |
| smaj12a-tr.glb | 10d ago |
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SMAJ12A-TR
STMicroelectronics · TVS · SMA(DO-214AC)
SMAJ12A-TR from STMicroelectronics, in a SMA(DO-214AC). 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 unidirectional SMAJ12A TVS diode, marked by the cathode band on the package, with 12 V stand-off voltage (VRM) and 13.3 V minimum breakdown voltage at 1 mA. |
| 2 | A | passive | Anode of the unidirectional SMAJ12A TVS diode, with 400 W peak pulse power (10/1000 µs) and a maximum clamping voltage of 19.9 V at 20.1 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMA(DO-214AC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak pulse power dissipation | PPP | 400 | W | Tj initial = Tamb, Tamb = 25 °C | 2 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 2 | ||
| Operating junction temperature range | Tj | -55 | 150 | °C | 2 | ||
| Maximum lead temperature for soldering | TL | 260 | °C | during 10 s | 2 | ||
| Thermal resistance junction to leads | Rth(j-l) | 30 | °C/W | 2 | |||
| Thermal resistance junction to ambient | Rth(j-a) | 120 | °C/W | on printed circuit on recommended pad layout | 2 | ||
| Leakage current at VRM | IRM | 0.2 | µA | @VRM, 25 °C | 3 | ||
| Leakage current at VRM | IRM | 1 | µA | @VRM, 85 °C | 3 | ||
| Stand-off voltage | VRM | 12 | V | 3 | |||
| Breakdown voltage | VBR | 13.3 | 14 | V | @IR = 1 mA, pulse test tp < 50 ms | 3 | |
| Clamping voltage 10/1000 µs | VCL | 19.9 | V | @IPP = 20.1 A, 10/1000 µs | 3 | ||
| Dynamic resistance 10/1000 µs | RD | 0.259 | Ω | 10/1000 µs | 3 | ||
| Clamping voltage 8/20 µs | VCL | 25.3 | V | @IPP = 91 A, 8/20 µs | 3 | ||
| Dynamic resistance 8/20 µs | RD | 0.116 | Ω | 8/20 µs | 3 | ||
| Voltage temperature coefficient | αT | 8.3 | 10-4/°C | 3 |
CAD (KiCad official)
- Symbol:
SMAJ12A-TR - Footprint:
Diode_SMD:D_SMA - 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files:
smaj12a-tr-etched.step/smaj12a-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj12a-tr.step/smaj12a-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (10 pp, sha256
4bb181453198810d, retrieved 2026-10-22, tier: manufacturer) - 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).