The 1.5SMC180AHM3/H: The clamping voltage is the spec that decides whether the protected rail survives a transient: if the 246 V clamp exceeds the downstream device's abs-max rating, the TVS is not a fit regardless of the standoff margin.
AEC-Q101 Grade 0 — the under-hood temperature band
The 1500 W peak-pulse rating is derated above 25 °C per the datasheet curve; at 125 °C junction the derated capability is roughly 75 % of the 25 °C figure, so budget the clamping margin at the worst-case operating temperature.
DO-214AB SMC — board-fit and reflow profile
Housed in the DO-214AB (SMC) package, a standard surface-mount footprint shared across the 1.5SMC family — the same copper pad pattern serves the full voltage range from 5.0 V to 440 V standoff, so a single PCB layout covers multiple BOM positions. Supplied on tape and reel, compatible with JEDEC MSL-1 reflow profiles — no moisture bake required before assembly if the seal is intact.
Active production — no last-time-buy window open
No official successor or second-source cross-reference is recorded; the 1.5SMC180 base number is the direct orderable variant for the 154 V standoff voltage.