What the 1500 W rating means on a real board
The 1.5KE8.2AHE3_A/C: The 1500 W peak pulse power is specified with a 10/1000 µs exponential waveform — the standard for telecom and industrial surge testing (IEC 61000-4-5). Breakdown occurs at a minimum of 7.79 V (the Zener knee), so the part stays out of conduction below the normal operating voltage of a 7 V rail. The 7.02 V standoff voltage is the maximum DC voltage the diode can withstand without significant leakage. The DO-201AA axial package (DO-27 footprint) is through-hole — the leads handle the thermal pulse better than a surface-mount package for the same power level, and the body is easy to hand-rework with a soldering iron if a board needs a replacement after a surge event.
Sourcing and compliance for the BOM
The -HE3 suffix indicates AEC-Q101 automotive qualification and RoHS compliance.