Clamp voltage and the surge budget
The 5KP16CA-TP clamps at a maximum of 26 V with a peak pulse current applied — the 26 V ceiling is what the downstream circuit sees during a surge event, so the rail being protected must tolerate that clamping level as its worst-case transient. The minimum breakdown of 17.8 V sets the onset threshold; the standoff rating of 16 V is the working DC rail the diode leaks across when idle.
5 kW peak pulse in an axial R-6 package
Rated 5000 W peak pulse in the R-6 axial body — the 5 kW figure is a single-event, short-duration surge rating per the relevant test waveform, not a continuous dissipation figure. The Tj max of 175 °C gives substantial headroom for thermal cycling in industrial enclosures, and the -55 °C low end covers outdoor and cold-start environments without derating concerns.
Through-hole R-6 — board assembly context
The R-6 axial package and through-hole mounting mean this part is wave-soldered or hand-soldered into the board — not a reflow-profile part. Available on Tape & Reel or Cut Tape, so it kits cleanly for production runs and can also be ordered as loose pieces for service stock.