What the ratings mean for a replacement
The 1.5KE440CA_R2_00001: The DO-201AE axial-lead package mounts through-hole on the board, which makes it straightforward to extract with a hot-air station or desoldering iron — the leads are thick enough to wick heat without lifting the pad, and the body is large enough to grip with pliers after the solder melts.
Obsolete — sourcing path
Panjit lists this part as Obsolete.
Thermal and pulse handling
The junction temperature range spans -65°C to +175°C, which covers both cold-start and hot-bench conditions in industrial or telecom gear. The 1500W peak pulse rating at 10/1000µs is the standard TVS metric — it assumes a single 1ms exponential pulse at 25°C ambient; repetitive pulsing or elevated ambient requires derating per the device's power dissipation curve.