1500 W peak pulse, 17.8 V standoff — what the ratings mean for the BOM
The 1.5KE22CHE3/73: A 47 A peak pulse current (Ipp) at the clamping voltage gives the energy-handling capacity for automotive load-dump and inductive kickback events. The 19.8 V minimum breakdown voltage ensures the device starts clamping before the rail exceeds the downstream IC's abs-max rating.
Automotive grade and package fit
The DO-201AA (DO-27) axial-lead package fits standard through-hole PCB layouts. The 1.5KE package footprint is shared across the series, so a board designed for a 1.5KE22A accepts this part without layout changes.
Obsolete — sourcing through independent channels
Vishay lists the 1.5KE22CHE3/73 as obsolete. A cross-reference to a different Vishay TVS with the same 17.8 V standoff and 1500 W rating may exist, but no pin-compatible replacement is documented in the official record.