1500 W peak pulse, 12.8 V standoff — what the ratings mean for the BOM
The 1.5SMC15A-M3/9AT: That 1500 W peak pulse rating means it can absorb a single high-energy transient — like an inductive load dump or lightning surge on a 12 V rail — without failing short. The 12.8 V reverse standoff voltage sits just above a nominal 12 V supply, so the diode stays out of the circuit during normal operation and only conducts when the line spikes above its breakdown threshold (14.3 V min).
Surface-mount DO-214AB and temperature range
Housed in the DO-214AB (SMC) package, it is a standard surface-mount footprint for TVS diodes — the same pad layout as the SMCJ series, so it drops into existing board layouts without a footprint change.