The STMicroelectronics SM15T12A is a unidirectional Zener-type TRANSIL™ TVS diode in a DO-214AB (SMC) surface-mount package. It is designed to clamp voltage transients on a 10.2 V DC rail, with a minimum breakdown voltage of 11.4 V and a maximum clamping voltage of 21.7 V at the rated peak pulse current of 461 A (8/20 µs waveform). The 1500 W peak pulse power rating (1.5 kW) defines its ability to absorb surge energy from events like inductive load switching or lightning-induced transients without failing.
Package and footprint
The SM15T12A is supplied in a DO-214AB (SMC) package, a standard surface-mount outline for medium-power TVS diodes. The SMC body measures approximately 7.1 mm x 6.2 mm with a 2.6 mm height, and the gull-wing leads provide a solder joint that can be inspected visually. The footprint matches the industry-standard SMC land pattern — no special pad geometry needed. The part is rated for a continuous operating junction temperature of 150°C, so the PCB layout should include adequate copper area on the cathode tab to dissipate heat from repetitive surge events.
Active status and sourcing posture
For volume or scheduled deliveries, an RFQ will return a firm price and lead time based on the requested quantity and date-code requirements.