Automotive-grade bidirectional TVS, 1500 W peak pulse
The 1.5SMC43CAHE3/9AT: The 36.8 V standoff means this part protects a 36 V nominal rail — typical for 24 V automotive systems with load-dump or alternator field-decay transients that can exceed 40 V.
Clamping voltage and breakdown window
Minimum breakdown voltage is 40.9 V, so the TVS starts conducting before the rail reaches 41 V, and the clamp holds at 59.3 V maximum — well below the typical 60 V abs-max rating of downstream DC-DC converters in an automotive ECU. Housed in a DO-214AB (SMC) package, the footprint matches the industry-standard SMCJ outline — a direct drop-in for existing board layouts using that package code.