The 1.5KE9.1A A0G: Its 7.78 V reverse standoff voltage means it stays transparent on a nominal 5 V or 6 V rail, clamping at 13.4 V max to shunt transients up to 117 A.
Through-hole DO-201, -55 to 175 °C — board-fit and environment
Housed in a DO-201AA (DO-27) axial leaded package, the part mounts through-hole — the leads handle the thermal pulse of a 1500 W surge without the PCB copper spreading that a surface-mount package would need. The junction temperature range spans -55 °C to 175 °C, covering industrial and automotive under-hood thermal profiles without derating the peak power.