Obsolete TVS — last-time-buy and surplus sourcing
The P6KE400CA-T: No official successor is recorded for this part. The functional replacement path depends on the board's clamping voltage and package constraints — a different DO-15 TVS with matching 342 V standoff and 548 V clamp would require a new BOM line and verification.
Clamp voltage and peak pulse — what the ratings mean for fit
Reverse standoff voltage is 342 V, meaning the TVS draws negligible leakage below that rail; breakdown occurs at 380 V minimum, so a 342 V nominal bus sees no clamping during normal operation. Bidirectional (single channel) — both polarities are clamped symmetrically, which suits AC-coupled signal lines or DC rails where reverse polarity protection is needed without a series diode.
DO-15 axial — board-fit and temperature envelope
Through-hole DO-204AC (DO-15) axial package — the 0.032-inch diameter leads suit hand-insertion or wave-solder assembly; the body length is roughly 7.6 mm, fitting standard 5 mm lead spacing on the PCB.