Clamp voltage and pulse rating for the 6.4V rail
The 1.5KE7.5AHR0G is a 1500W peak-pulse Zener TVS diode from the 1.5KE series, designed to protect a 6.4V nominal rail from transients. Its reverse standoff voltage of 6.4V means it stays transparent below that level, then breaks down at a minimum of 7.13V and clamps at 11.3V at the full 139A peak pulse current (10/1000µs waveform). The 1500W rating is the peak pulse power dissipation for the 10/1000µs exponential waveform — the device absorbs that energy without failing, provided the junction temperature stays within the -55°C to 175°C range.
Automotive qualification and package fit
The DO-201AA axial package (DO-27 footprint) is a through-hole form factor suited for point-of-entry protection on a PCB or terminal block.