Obsolete — sourcing through independent channels
The 1.5KE30C-E3/54: The 1.5KE30C-/54 is listed as Obsolete by Vishay General Semiconductor. For a BOM line that still calls out this exact part, independent surplus and broker channels are the practical supply route.
Key ratings and what they mean for circuit fit
Reverse standoff voltage is 24.3V typical; the protected rail must stay below this during normal operation to avoid clipping the signal or supply.
Temperature range and package
Housed in a DO-201AA (DO-27) axial-lead through-hole package — the same footprint as the standard 1.5KE series, so a legacy PCB layout that accepted earlier 1.5KE parts takes this device without board changes.