Automotive-grade TransZorb TVS — 1500 W peak pulse, DO-201AA axial
The Vishay 1.5KE18CHE3/73 is a 1500 W (1.5 kW) peak pulse power TransZorb TVS diode in the DO-201AA axial-lead package, part of the Automotive, AEC-Q101 qualified series. It provides unidirectional transient voltage suppression for 14.5 V nominal rails, clamping transients at 26.5 V maximum. The 1500 W rating at the device level means the clamping circuit absorbs the surge without the TVS itself failing short.
Breakdown and clamping — 16.2 V min breakdown, 26.5 V clamp ceiling
Minimum breakdown voltage is 16.2 V, with a reverse standoff (working voltage) of 14.5 V. A single bidirectional channel handles transients in both polarities, simplifying the BOM for AC-coupled or floating signal lines.
Vishay has marked the 1.5KE18CHE3/73 as obsolete. The AEC-Q101 qualification and TransZorb construction remain the key trust signals for automotive applications where a 14.5 V working rail needs a known clamping ceiling. The DO-201AA axial package is through-hole, so a board respin is required to migrate to a surface-mount alternative.