The 1.5KE440A_R2_00001: No official successor order code is recorded against this part. A direct parametric replacement would need the same DO-201AE footprint, 1.5 kW peak pulse rating, and 376 V reverse standoff voltage.
Clamping, breakdown, and standoff — the protection envelope
The reverse standoff voltage is 376 V typical — this is the continuous DC voltage the diode blocks without conducting. The 600 V clamp sets the voltage the downstream circuitry sees during a surge event. For a 376 V nominal rail, this provides a 224 V headroom between normal operation and the clamped transient — typical for protecting equipment on 480 VAC three-phase systems where line-to-neutral transients can exceed 400 V.
DO-201AE axial — board integration
Through-hole DO-201AE axial package. The leads are formed for through-hole insertion; the body diameter and lead spacing are standard for this JEDEC outline. No power line protection feature — this is a unidirectional device (one channel) for DC rail clamping. Operating junction temperature range spans -65 °C to 175 °C, covering military-grade thermal environments. The wide range suits outdoor telecom cabinets or industrial enclosures where internal ambient can exceed 85 °C.