What the ratings mean for a repair bench
The 1.5KE100-E3/73: The DO-201AA (DO-27) axial package is a through-hole form factor that survives repeated soldering and is straightforward to replace on a board with a soldering iron or hot-air station.
Lifecycle reality — this part is obsolete
Vishay has marked the 1.5KE100-/73 as Obsolete.
