What the 1500W rating means for your protection design
The 1.5KE22HE3/73: Its 17.8V reverse standoff voltage protects 18V rails, clamping transients to 31.9V at 47A (10/1000µs waveform). The 19.8V minimum breakdown ensures the device starts conducting before the protected circuit's absolute maximum is reached.
Lifecycle reality — obsolete but available
Vishay has marked the 1.5KE22HE3/73 as obsolete. No official successor order code is recorded. For new designs, a functionally equivalent TVS with the same 1500W rating and DO-201AA package should be selected from Vishay's active TransZorb portfolio.
Package and board integration
The DO-201AA (DO-27) axial leaded package is a through-hole form factor suited for point-to-point wiring or PCB mounting with 0.040-inch diameter holes. The single unidirectional channel protects one rail per device.