Clamping voltage and surge rating for 376V rails
The 1.5SMC440AHE3_ALL: The 418V minimum breakdown voltage ensures the device stays off during normal operation on a 376V bus, then fires within the avalanche region to shunt transients before they damage downstream electronics.
Automotive qualification and temperature range
AEC-Q101 qualification means this part has passed the automotive stress tests: high-temperature reverse bias, temperature cycling, and ESD robustness.
For a BOM hedge, qualify the alternate breakdown voltage within the same family if the 376V standoff is not a hard constraint.
