What the 1.5 kW rating means on a real board
The 1.5SMC30CAHM3_A/H: Bidirectional single-channel construction means it clips both positive and negative transients symmetrically, so you don't need to worry about orientation on the PCB — the scorch mark tells you which side took the hit, but the part works either way.
Automotive-grade qualification and temperature range
AEC-Q101 qualification means this TVS diode passed the full automotive stress battery — temperature cycling, high-temperature reverse bias, and ESD robustness — so it's suited for under-hood and cabin electronics where the ambient hits 150 °C junction max.
Package and board-fit for the DO-214AB SMC
The large tab area conducts heat to the PCB copper pour during repetitive surge events. Tape-and-reel packaging suits high-volume pick-and-place; the part is also available in bulk for rework or low-volume builds.