Protection specs that define the fit
The P6KE16A-T: The 13.6 V reverse standoff voltage means it stays off the circuit below that rail — the diode does not load a 12 V or 13.6 V supply line during normal operation. Breakdown occurs at 15.2 V minimum, so the TVS triggers before the clamping voltage is reached, shunting the surge away from the protected load. This is a unidirectional device — one channel, cathode band marked — suited for DC lines where polarity is fixed.
Where it fits and where it does not
The DO-204AC (DO-15) axial leaded package is a through-hole footprint that mounts into a standard 0.025-inch diameter hole pattern on a PCB or terminal block. Power line protection is not supported — the diode is rated for signal and data-line transient suppression, not for AC mains or high-energy industrial power rails. The 600 W rating suits Ethernet ports, sensor inputs, and low-power DC buses where the energy in a typical ESD or surge event stays under that ceiling.