Transient suppression for 5V rails
The 1.5KE6.8A-T-F: Its 5.8V reverse standoff voltage and 6.45V minimum breakdown voltage place it squarely on 5V DC power rails — clamping at 10.5V, it catches transients before they reach downstream silicon.
Peak pulse current and clamping margin
That current rating is the one that matters for fuse coordination and PCB trace width — the 1.5kW power rating is the product of clamp voltage and current, but the 143A figure is what the bond wires and die metallisation actually survive. The DO-201 axial package (DO-201AA, DO-27 variant) is through-hole, so the leads carry the heat into the PCB copper; the thermal path is better than a surface-mount equivalent at this power level.