600W Zener TVS — the scorch-mark tells you what failed
The P6KE250A-T is a 600W peak-pulse Zener TVS from Diodes Incorporated, in a through-hole DO-15 axial package. It clamps at 344V maximum and has a 214V reverse standoff — that 214V figure is the DC rail voltage it protects without conducting leakage. When a surge hits, the avalanche breakdown starts at 237V minimum and the device shunts the energy to ground.
Obsolete — the sourcing reality for this DO-15 TVS
Diodes Incorporated lists the P6KE250A-T as obsolete. That means new designs should not target this part; for existing BOM lines, the supply channel is independent distribution and surplus inventory. The base product number is P6KE250, and the -T suffix indicates Tape & Reel packaging. If you are repairing a board and the scorch mark points to this TVS, the through-hole DO-15 footprint is standard — a replacement from the same P6KE family with the same 214V standoff and 600W rating will fit the same holes.
The operating junction temperature range spans -55°C to 175°C. That is the full industrial/military band — the TVS will sit in an outdoor telecom cabinet or an engine-bay ECU without derating the peak pulse power at the hot end. The 175°C TJ(max) is the same as the P6KE series standard; the limiting factor in a real board is the solder joint and the PCB copper pour, not the device itself. No power line protection — the device is a unidirectional Zener TVS, so it clamps only one polarity. For AC line protection you would need a bidirectional part; this one is for a DC rail where the negative side is ground.