Surge rating and protection window
The 1.5KE15C-B: The reverse standoff voltage of 12.8V means the device draws negligible leakage current at normal operating voltage; clamping begins when the transient exceeds the minimum breakdown voltage of 13.55V and limits the peak to 22.26V at the rated 71.7A peak pulse current (10/1000µs waveform). The single bidirectional channel protects against both positive and negative surges in a single DO-201 axial package, simplifying board layout for symmetrical rail protection.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE15C-B as Obsolete. No official successor order code is recorded for this specific bidirectional 12.8V variant within the 1.5KE family. The part is no longer available through authorized distribution channels. For sustainment of existing designs, the 1.5KE15C-B is sourced through independent surplus and broker channels.
Temperature range and package fit
The DO-201AA / DO-27 axial leaded package requires a through-hole hole pattern on the PCB — a legacy footprint that may need manual or wave-solder assembly rather than reflow.