1500 W peak pulse clamp rating
The 1N6275AHE3/51: At that clamping voltage the part clamps the protected rail to 21.2 V maximum at a peak pulse current of 70.8 A, which sets the board-level let-through ceiling for any downstream silicon the rail feeds.
Clamping voltage and breakdown axis
Minimum breakdown is 14.3 V — the device stays off and leaks minimally below that threshold, snapping into conduction above it. The 21.2 V clamping maximum is the spec that matters for selecting downstream IC abs-max margins: the protected rail sees no more than that ceiling under the 70.8 A peak pulse condition.
Automotive grade and thermal headroom
The AEC-Q101 qualification marks this as automotive-screened — the -55 to 175 °C junction temperature range covers engine-bay and under-hood thermal profiles, and the 175 °C ceiling is wider than the commercial 150 °C ceiling on a standard 1.5KE device. Bulk packaging confirms a through-hole axial form factor (DO-201AA, DO-27) that mounts in a PCB hole and takes solder wave or hand-solder.
Sourcing posture for an obsolete part
Independent distribution is the sourcing path; quantities, date code, and lot traceability are confirmed at RFQ.