Peak pulse power and thermal margin
The 1.5KE350CA_R2_00001: The DO-201AE axial-lead package is through-hole mounted, which simplifies hand-replacement on a board without a hot-air station — the leads are large enough to solder with a standard iron, and the body orientation is unambiguous because the cathode band is absent on bidirectional parts (both directions clamp symmetrically).
Obsolete — sourcing through independent channels
Panjit has marked this part as obsolete. No official successor order code is listed. For existing BOM lines that call out the 1.5KE350CA_R2_00001, the only supply path is through independent surplus or broker inventory.