STMicroelectronics SMCJ, TRANSIL™ series, SMCJ12A-TR, Zener TVS diode, 1500W (1.5kW) peak pulse power, 12V reverse standoff, 13.3V breakdown, 25.3V clamping, unidirectional, DO-214AB SMC package, surface mount, -55°C~150°C.
| Parameter | Value |
|---|---|
| Type | Zener |
| Series | SMCJ, TRANSIL™ |
| Mounting | Surface Mount |
| Voltage - breakdown | 13.3V |
| Voltage - clamping (Max) @ ipp | 25.3V |
| Voltage - reverse standoff | 12V |
| Current - peak pulse (10/1000μs) | 394A (8/20µs) |
| Power - peak pulse | 1500W (1.5kW) |
| Power line protection | No |
| Operating temperature | -55°C~150°C(TJ) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Applications | General Purpose |
| Case | DO-214AB, SMC |
| Unidirectional channels | 1 |
The minimum breakdown voltage is 13.3 V, which sits 1.3 V above the 12 V reverse standoff — enough margin to avoid nuisance triggering from normal rail ripple and load transients. Maximum clamping at the 394 A peak pulse current (8/20 µs) is 25.3 V, so downstream components rated for 30 V or higher see a safe voltage envelope.
STMicroelectronics lists the SMCJ12A-TR as Active (current production).
It is a unidirectional device — one channel, cathode band on the package. Use it on DC rails where the transient polarity is known; for AC or bidirectional protection, select the bidirectional variant from the SMCJ family.
The -TR suffix denotes Tape & Reel packaging. The base product number SMCJ12A is the same silicon die; the -TR variant ships on a reel for automated pick-and-place assembly. Cut Tape (CT) is also available.