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SMAJ12A-TR

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by adom

STMicroelectronics TVS, SMA(DO-214AC). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); smaj12a-tr.step / smaj12a-tr.glb are 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, primary claude-sonnet-5-5 (text), consensus claude-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).

Datasheet PDF