1500W Zener TVS in a DO-201AD Axial Package
The 1.5KE75AG is an onsemi Mosorb™ Zener transient-voltage-suppression diode rated for 1500W (1.5kW) peak pulse power under the 10/1000µs waveform. It clamps at 103V maximum with a 64.1V reverse standoff, meaning it holds off a 64V rail and starts conducting above 71.3V breakdown. This is a unidirectional device — one channel, cathode band on the body — in a DO-201AD axial-lead package for through-hole mounting.
With a 64.1V reverse standoff and 71.3V minimum breakdown, this part protects a nominal 48V or 60V bus without clipping normal ripple. The 103V maximum clamp at 14.6A peak pulse current tells you the voltage the load sees during a surge — if your downstream circuitry cannot survive 103V for the 10/1000µs pulse, you need a lower-clamp part or a multi-stage protector. The 1500W rating is the peak pulse power at the specified waveform; derate for higher ambient temperature per the datasheet curve.
Obsolete — Sourcing and Replacement Planning
onsemi lists the 1.5KE75AG as Obsolete. For a drop-in replacement in the same DO-201AD footprint, look at the 1.5KE75A from other major TVS manufacturers — Littelfuse, Vishay, and ST all offer functionally equivalent parts with the same 1500W rating, 64.1V standoff, and 103V clamp. Confirm the breakdown tolerance and surge capability match your BOM requirement before swapping. If you are qualifying a new design, skip the obsolete part and select a current-production 1.5KE-series TVS from the same footprint family.