Sourcing an obsolete automotive-grade part
The 1.5SMC300AHE3_A/H: The AEC-Q101 qualification and 1500W peak pulse rating make this a specific-fit part for automotive transient protection at the 256V standoff level.
Package and board-fit note
The DO-214AB (SMCJ) footprint is a standard surface-mount package for power TVS diodes. The 1.5SMC300AHE3_A/H ships in Tape & Reel packaging, consistent with automated pick-and-place assembly. No power line protection feature is built in — this is a standalone transient suppressor for signal and low-power supply rails.
