What the 1500W rating means for your protection design
The 1.5KE150C: That 1500W rating is the dissipation capability into a standard surge — it means the device can clamp a 7.3A peak pulse current to 217.35V without failing, assuming the PCB copper and ambient temperature stay within the derating curve. Breakdown starts at 135.45V minimum, so the protection window opens before the bus exceeds the downstream semiconductor ratings. The bidirectional channel means polarity doesn't matter — clamp in both directions from a single device, which simplifies board layout for AC-coupled lines or floating supplies.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE150C as Obsolete. For existing BOM lines, we source the 1.5KE150C through independent surplus and excess inventory channels.
Package and board integration
The DO-201AA (DO-27) axial leaded package is a through-hole form factor rated for the full 1500W pulse. The leads are tin-plated copper; the body is molded epoxy with a 175°C maximum junction temperature, so it handles reflow or wave solder without damage.