1.5kW bidirectional Zener — what the ratings mean for the BOM
The 1.5KE300C-B: The 256V reverse standoff voltage is the maximum DC or AC peak voltage the protected line can carry without the diode conducting — above that, the device clamps transients at 434.7V maximum while shunting 3.7A peak pulse current. The DO-201AA axial-lead package is a through-hole form factor that suits point-to-point wiring or PCB mounting with a 0.100-inch lead spacing — the same footprint as standard 1N62xx and 1.5KE series parts.
Where it fits in the circuit
Classified under Circuit Protection, this TVS is designed for general-purpose transient suppression on DC power rails, signal lines, or low-frequency AC lines where the steady-state voltage stays below 256V. The 1500W peak pulse rating at 10/1000µs means it can absorb a single high-energy surge, but repetitive pulsing must be evaluated against the junction temperature rise.