What the key ratings mean for the BOM
The 1.5KE75A A0G: The 64.1V reverse standoff voltage (working voltage) means the diode is effectively invisible to the protected rail under normal conditions — leakage is negligible until the transient pushes past 71.3V. The 103V clamp sets the maximum voltage the load sees during a surge; downstream components must survive at least that peak without damage. The DO-201AA (DO-27) axial package is a through-hole form factor suited for point-to-point wiring or PCB mounting with lead bending. No power line protection flag means this device is intended for DC bus or signal line clamping, not AC mains primary protection.