Obsolete 1500W TVS — what it means for your BOM
The 1.5KE250A-B: The 237V minimum breakdown voltage means the device starts conducting between 237V and the clamping ceiling — a 214V working rail stays below the avalanche threshold under normal conditions.
Through-hole DO-201 axial package — board-fit note
Housed in a DO-201AA / DO-27 axial leaded package, the 1.5KE250A-B is a through-hole part — the leads insert into plated holes on the PCB and are wave-soldered. The DO-201 body diameter and lead spacing are standard for this power class; the existing footprint on a legacy board should accept it without layout changes. Supplied in bulk packaging — no tape-and-reel, so it feeds through manual or tube-fed insertion rather than automated pick-and-place.
Sourcing an obsolete TVS — what to expect
Because the 1.5KE250A-B is obsolete, standard authorized-distributor channels no longer carry it as a stocked line. A functional replacement would require a parametric search for a 1500W, 214V standoff TVS in a DO-201 package — expect a different part number and possibly a different brand. The base product number is 1.5KE250 — the -B suffix indicates bulk packaging. Any replacement should match the 1.5KE250 core ratings: 214V standoff, 237V breakdown, 344V clamp.