1500W Zener TVS — surge rating and protection window
The 1.5KE51A/B: The reverse standoff voltage is 43.6V, meaning the protected rail can run at 43.6V DC or peak AC without the diode conducting leakage. Breakdown occurs at 48.5V minimum, and the clamping voltage is held to 70.1V at the peak pulse current — the load sees no more than 70.1V during the surge event.
Axial through-hole package and temperature range
Housed in a DO-201AA / DO-27 axial-lead package, the 1.5KE51A/B mounts through-hole on a PCB or terminal strip — the axial body and 0.040-inch leads suit point-to-point wiring or board-level transient protection where the surge current path must be short and low-inductance. Junction temperature range is -55°C to 150°C, covering military and industrial ambient conditions — the derating curve above 25°C reduces the peak pulse power linearly, so at 125°C the effective rating is roughly 50% of the 1500W figure.