Obsolete – sourcing and replacement planning
The 1.5KE36ARL4 is marked Obsolete by onsemi. That means onsemi has stopped production and no further manufacturing is planned. For a BOM that still needs this protection diode, the options are a last-time buy from remaining distributor stock or a pin-compatible replacement within the 1.5KE family.
That 1500W rating tells you the device can absorb a single 30A surge without failing, provided the clamping voltage stays at 49.9V max. For a 30.8V rail, the margin between the operating voltage and the 34.2V minimum breakdown is about 3.4V — enough to avoid false triggering on normal ripple but tight enough that a 10% overvoltage event will start conduction. The 1500W rating is the headline number for surge comparison; if your transient energy exceeds that, step up to the 1.5KE series' higher voltage variants or a larger package.
DO-201AD axial – through-hole assembly fit
The 1.5KE36ARL4 comes in a DO-201AD axial package, which means it is a through-hole part with leads on both ends. It mounts into a board via plated through-holes and is typically wave-soldered or hand-soldered. The axial lead form factor is common for high-power TVS diodes because the large body and thick leads handle the thermal pulse of a 1500W surge.