Obsolete automotive TVS — sourcing the 1.5KE30HE3/54
The 1.5KE30HE3/54 is listed as obsolete by Vishay, meaning the manufacturer no longer produces it. A board-level replacement would require a functionally equivalent automotive-grade TVS in the same DO-201AA footprint with matching 24.3V standoff and 1500W peak pulse rating.
AEC-Q101 qualification and the 1500W pulse envelope
This is an automotive-grade TransZorb TVS, qualified to AEC-Q101 — the stress and reliability screening for under-hood electronics. This places it on a 24V automotive bus where the nominal rail sits below the standoff and the clamp triggers before the downstream ECU input sees damaging overvoltage.
DO-201AA axial footprint and temperature range
The DO-201AA (DO-27) axial-lead package is a through-hole form factor — the body diameter and lead spacing match the standard 1.5KE series footprint. The operating junction temperature range spans -55°C to 175°C, covering the full automotive temperature envelope including engine-bay soak-back. The base product number is 1.5KE30, and the supplier device package code is 1.5KE.