The 1.5SMC51AHE3_A/I is a 1500 W (1.5 kW) peak pulse power Zener TVS from Vishay's 1.5SMC series, in the TransZorb® family. The clamped voltage of 70.1 V is what the downstream silicon sees; a 40 V-rated DC-DC converter or a 60 V-rated MOSFET on that rail has margin.
Automotive qualification and temperature range
AEC-Q101 qualification means this part has passed the automotive-grade stress tests: high-temperature reverse bias, temperature cycling, and ESD robustness per the AEC-Q101 rev E standard. The 'HE3' suffix in the order code indicates the automotive-grade version with the full AEC-Q101 qualification and the Vishay Green (RoHS-compliant) plating.
Package and board-fit for the DO-214AB (SMC)
The supplier device package is listed as DO-214AB (SMCJ), which is the JEDEC-standardized version of the same body. The cathode band is marked on the body; the anode is the larger tab. For a 1500 W pulse, the PCB copper area under the tab sets the thermal impedance — a 1 oz copper pour of at least 300 mm² on the top layer keeps the junction temperature rise within the derating curve for repetitive pulses. The package is compatible with standard reflow profiles (MSL level 1, typical for this series).
Active lifecycle — no end-of-life concern for new designs
This part is suitable for both new design-ins and ongoing production. Vishay General Semiconductor - Diodes Division is the manufacturer.