Transient suppressor for 17.8 V rails
The 1.5KE22-E3/73: With a peak pulse power rating of 1500 W (10/1000 µs waveform), it handles surge events like inductive load dumps or lightning-induced spikes without letting the protected rail exceed 31.9 V.
Clamping voltage and breakdown margins
Breakdown occurs at a minimum of 19.8 V, and clamping is guaranteed at 31.9 V maximum when the peak pulse current reaches 47 A. That 12.1 V window between standoff and clamp gives the designer headroom for tolerance on the upstream rail while keeping the protected IC within its abs-max rating.
Through-hole axial package and thermal reach
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE22-/73 is a through-hole part intended for point-to-point wiring or PCB mounting with the leads formed. The axial body conducts heat into the board traces — for sustained repetitive surges, the trace copper area sets the derating curve, not the die itself.
Obsolete — sourcing through independent channels
Vishay has marked the 1.5KE22-/73 as obsolete. No official successor order code is recorded.