Breakdown voltage and transient protection envelope
The 1.5SMC68AHE3/57T is an automotive-qualified unidirectional Zener TVS (TransZorb®) in the DO-214AB (SMC) package, rated to clamp at 92 V max under a 16.3 A peak pulse (10/1000 µs) — meaning it absorbs a 1.5 kW transient surge and clamps the protected rail to a voltage the downstream circuitry survives. The 58.1 V reverse standoff Typ places the working rail just below the minimum breakdown of 64.6 V; any overvoltage event exceeding that threshold causes the Zener channel to avalanche and clamp, routing the surge current to ground before the protected node sees damage.
Automotive temperature and qualification grade
Surface-mount DO-214AB is the standard SMC package for this series; the foot pattern lands on the board with the same thermal pad practice as other SMC-bodied TVS parts in the same family, so a replacement pin-compatible part in the same series shares the same pad layout.
Sourcing and availability
Vishay lists the 1.5SMC68AHE3/57T as Active; it carries the full series base number 1.5SMC68, confirming it sits within an active family with continued automotive production support. Sourced through independent distribution and quoted to order — availability and lead time confirmed at RFQ against your BOM quantity.