The 1.5SMC480AHE3_A/H is marked Obsolete by Vishay, meaning the manufacturer has discontinued production with no scheduled last-time-buy window. For a pin-compatible replacement within the same 1.5SMC family, a parametric cross-reference against the 456V breakdown and 658V clamping limits is the practical path — the DO-214AB footprint stays constant across the series.
Clamping performance and the 1500W rating
For a 400V nominal bus with a 10% tolerance, the 408V standoff provides margin against steady-state overvoltage without nuisance triggering.
Automotive qualification and temperature grade
AEC-Q101 qualified — the automotive discrete semiconductor stress test suite covering temperature cycling, high-temperature reverse bias, and ESD robustness. Unidirectional Zener type with a single protection channel — correct for DC rail clamping where the transient polarity is known.