1.5 kW bidirectional Zener TVS in DO-201AA
The 1.5KE100C-E3/73: The single bidirectional channel means a single device clamps both polarities, simplifying board layout for AC or bipolar DC rails.
Clamping and temperature envelope
The 144 V clamping voltage at 10.4 A sets the maximum voltage the protected load sees during a surge — a 100 V-rated capacitor downstream would be stressed beyond its rating, so the designer must budget the clamping ceiling into the rail's voltage tolerance. The 90 V minimum breakdown voltage gives a guard band above the 81 V standoff — the device starts conducting between 90 V and the clamping ceiling, not at the standoff level.
Obsolete — sourced through independent channels
Vishay lists the 1.5KE100C-/73 as obsolete, meaning the original manufacturer no longer produces it. The DO-201AA axial package and through-hole mounting are standard for this power class, so a replacement from another manufacturer with the same footprint and 1.5 kW rating is a functional cross-shop candidate, but no direct drop-in is documented.