What the 1500W peak pulse rating means for the BOM
The 1.5KE43CHE3/54: The 34.8 V reverse standoff voltage sits below the clamping ceiling, so the diode stays transparent during normal operation and only conducts when the line exceeds that threshold. The 38.7 V minimum breakdown voltage gives a guard band against the standoff level, ensuring the part does not self-trigger on nominal rail ripple.
Package and board-fit for the DO-201AA axial lead
Housed in a DO-201AA (DO-27) axial-lead package, this TVS mounts through-hole — the lead spacing and body diameter match the standard 0.375-inch lead form common in automotive junction boxes and power distribution modules. The 1.5KE supplier device package code confirms the same lead and body dimensions across the 1.5KE family, so the PCB footprint is shared with other voltage variants in the series.
Sourcing an obsolete AEC-Q101 TVS diode
For a BOM that already qualifies this TVS, the DO-201AA footprint and AEC-Q101 qualification are locked — a replacement means a board spin or a different package.