600 W Zener clamp — 17.1 V rail protection
The P6KE20A-T: Breakdown voltage is guaranteed at a minimum of 19 V, so the device starts conducting before the rail exceeds the downstream component's absolute maximum rating. No power line protection (the diode is not designed for continuous AC mains clamping) — it is a transient clamp for DC rails.
DO-15 axial — through-hole board fit
Housed in a DO-204AC (DO-15) axial leaded package, the P6KE20A-T mounts through-hole. The lead spacing and body diameter match the standard DO-15 footprint — no board spin required if your existing layout already accommodates this common TVS package. Tape & Reel packaging suits automated insertion for volume builds.