Obsolete — last-time-buy sourcing
Vishay lists the 1.5KE9.1CHE3/73 as Obsolete.
Protection window and pulse rating
A bidirectional Zener TVS, the 1.5KE9.1CHE3/73 clamps at 13.8 V max (at 109 A peak pulse current, 10/1000 µs waveform) and has a reverse standoff of 7.37 V. The breakdown voltage range starts at 8.19 V min. The 109 A peak pulse current figure is the corresponding current at the clamping voltage for the standard 10/1000 µs waveform.
Automotive grade and temperature envelope
AEC-Q101 qualified — the automotive discrete semiconductor reliability stress suite. This covers temperature cycling, high-temperature reverse bias, and ESD robustness per the AEC-Q101 test plan. Operating junction temperature range is -55°C to 175°C — the full automotive under-hood band. The 175°C upper limit allows placement near exhaust-adjacent or turbocharger-adjacent electronics without derating the junction temperature. Packaged in the DO-201AA (DO-27) axial leaded through-hole format. The 1.5KE package suffix is the Vishay standard for this power level.