Protection threshold and clamping margin
The 1.5KE150A B0G: Its 143 V minimum breakdown voltage and 207 V maximum clamping define the protection envelope: the downstream circuit must survive a clamped transient up to 207 V at 7.6 A peak pulse current. The 128 V reverse standoff voltage means the diode draws negligible leakage below that rail level, so it sits across a 120 V or 125 V DC bus without loading it during normal operation.
Package and deployment context
Housed in a DO-201AA (DO-27) axial-leaded through-hole package, the 1.5KE150A B0G mounts into standard 0.040-inch diameter plated-through holes on a PCB or terminal block. It is not rated for power-line protection (no internal crowbar or coordinated MOV), so it belongs on DC rails, signal lines, or low-voltage AC secondary sides — not the mains input.