The Vishay 1.5SMC43AHM3/I is a Zener-type transient voltage suppressor (TVS) diode from the 1.5SMC series, part of the TransZorb® family. It is qualified to AEC-Q101, the automotive-grade discrete semiconductor reliability standard, meaning it has passed the temperature cycling, high-temperature reverse bias, and ESD sensitivity tests required for under-hood and chassis-domain electronics. The reverse standoff voltage is 36.8 V, and breakdown occurs between 40.9 V minimum — this window defines the protection threshold for a 36 V nominal rail.
Package, temperature, and deployment
The wide temperature range suits it for engine-bay and exterior automotive modules where ambient heat soaks above 105°C are routine. The series is listed for automotive and telecom applications — the AEC-Q101 qualification and 1500 W surge capability make it a fit for 12 V/24 V vehicle battery-line protection, as well as telecom line cards that must survive lightning-induced transients per GR-1089.