Key electrical ratings and deployment context
The 1.5KE43CHE3/73: This is a 1500 W peak pulse power TVS diode (10/1000 µs waveform) in a bidirectional Zener configuration. The 34.8 V standoff means it protects 36 V nominal rails (common in 24 V automotive systems with load-dump transients) without conducting during normal operation. The 61.9 V clamp keeps the surge voltage below the typical 70 V abs-max of downstream DC-DC converters.
Housed in a DO-201AA (DO-27) axial-lead through-hole package. The lead spacing and body diameter match the standard 1.5KE footprint — no board layout change versus other 1.5KE-series parts. The bidirectional marking means no orientation concern during insertion.