TVS diode for 154V rails
The P6KE180A-B: With a 154V reverse standoff voltage, it protects 154V DC or 110V AC nominal rails from transients up to 246V clamping.
Clamp voltage and pulse current
Breakdown occurs at 171V minimum (the avalanche threshold), and the clamp is held at 246V maximum while conducting 2.4A of peak pulse current. That 75V window between breakdown and clamp gives the downstream silicon a defined energy-absorption budget. The 600W rating is the product of clamp voltage and peak current at the 10/1000µs pulse shape — a standard telecom surge waveform. For shorter pulses (8/20µs) the part absorbs significantly more peak power, but the 10/1000µs figure is the one to use for BOM derating against IEC 61000-4-5.
Through-hole axial package
Housed in a DO-204AC (DO-15) axial-lead package, it is a through-hole part — the leads are long enough to form into PCB holes or solder into turret terminals. The body is 0.034-inch diameter, so it fits standard 0.040-inch plated through-holes without forcing. Bulk packaging means the parts ship loose in a bag or tube — no reel, no carrier tape. For a repair kit or a low-volume build, that is fine; for a pick-and-place line you want the taped version (P6KE180A).
Temperature range and general-purpose use
The junction operates from -55°C to 175°C, covering industrial and automotive under-hood ambient without derating. No power-line protection (it is a Zener, not a bidirectional or steering-diode array), so it is meant for DC signal or low-frequency power rails, not AC mains.