The 1.5SMC47AHE3/57T is a 1500 W peak pulse power Zener TVS diode from Vishay's 1.5SMC series, qualified to AEC-Q101 for automotive applications. The unidirectional clamping action (single channel) means the cathode band on the DO-214AB package must face the positive rail.
AEC-Q101 qualification and -65 to 150 °C operating range
This part carries AEC-Q101 automotive qualification, meaning it has passed the stress tests (temperature cycling, high-temperature reverse bias, humidity, and ESD) required for under-hood and cabin electronics. The junction temperature range of -65°C to 150°C covers cold-crank and under-hood heat soak.
Package and board-fit for DO-214AB (SMC)
The supplier device package is listed as DO-214AB (SMCJ), which is the same mechanical outline. The copper pad area under the cathode tab on the PCB sets the thermal resistance — a larger pad improves heat sinking during repetitive surge events. The part ships on tape and reel (TR), compatible with standard pick-and-place assembly.