1500 W peak pulse, DO-201 axial — what the ratings mean for your BOM
The 1.5KE100-B: That 1500 W rating means it can absorb a single transient of that energy without failing — useful for clamping surges on 85.5 V rails in industrial or telecom power supplies. The breakdown voltage range starts at 90 V, so the device begins conducting just above the normal operating rail. The DO-201AA axial package (also known as DO-27) is a through-hole form factor suited for point-to-point wiring or PCB mounting where a robust mechanical connection is needed.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE100-B as obsolete. No official successor is listed, so new designs should consider an alternative TVS with similar standoff and clamping specs in the same DO-201 footprint. For existing BOM lines, this part is available through independent surplus and broker channels.