Clamping voltage and surge current: what the ratings mean for your BOM
As a unidirectional suppressor, the 1.5KE91AHE3_B/C clamps positive transients above the breakdown voltage and conducts forward as a standard diode on negative excursions — select a bidirectional part if the line carries both polarities.
Package and mounting: DO-201AA axial leaded
The DO-201AA (DO-27) axial package is a through-hole form factor rated for the 1.5KE series — the large body and lead cross-section handle the thermal dissipation during surge events without derating. Tape & Reel (TR) packaging supports automated insertion, while the axial leads allow manual or wave-solder assembly in prototype and low-volume builds.