3000W automotive transient suppressor for 15V rails
The STMicroelectronics SM30T18AY is a unidirectional Zener TVS diode from the TRANSIL™ SM30TY series, designed to clamp transients on automotive 15V supply lines. It delivers 3000W peak pulse power (10/1000µs waveform) with a clamping voltage of 24.4V at 123A peak pulse current. The 16.7V minimum breakdown voltage ensures the protection window stays tight against the 15V reverse standoff rating.
AEC-Q101 and the 175°C junction limit
AEC-Q101 qualification and the -55°C to 175°C operating junction temperature range qualify this part for under-hood and engine-bay environments where ambient heat and repetitive surge stress are the norm. The 175°C ceiling is the absolute junction limit — derate the 3000W peak pulse power above 25°C per the datasheet's thermal derating curve.
DO-214AB SMC — footprint and board-level fit
Housed in the DO-214AB (SMC) surface-mount package, the SM30T18AY uses the standard SMC footprint shared by many 3000W-class TVS diodes. No power line protection is built in — this is a unidirectional rail clamp, not a steering-diode array. The single-channel design protects one unidirectional line per device.