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 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.
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