Protection threshold and surge rating
The 1.5KE22ARL4G is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power (10/1000µs waveform). Its 18.8V reverse standoff voltage and 20.9V minimum breakdown voltage define the protection threshold for a nominal 18V rail; clamping is specified at 30.6V maximum at the 49A peak pulse current. The DO-201AD axial package handles the thermal surge through the lead-frame body, but the through-hole mount means the PCB hole diameter and solder fillet must carry the pulse energy without lifting the pad.
Obsolete status and sourcing path
onsemi has marked the 1.5KE22ARL4G as Obsolete. For a BOM line that still calls out this exact order code, the only procurement path is the open market or surplus inventory — we source and quote against your RFQ quantity.
Temperature range and application fit
Operating junction temperature spans -65°C to 175°C, which covers military and industrial environments — the 175°C ceiling is the same as many high-reliability Zener TVS diodes. The part carries no power-line protection rating, so it is intended for signal or low-voltage DC rail clamping, not AC mains surge suppression.