What the 1500W rating means on a 10V rail
The 1.5KE10C: That 1500W rating means it can clamp a transient up to 104.8A peak pulse current (Ipp) before the junction exceeds its thermal limit. The reverse standoff voltage is 8.55V, so it sits across a 5V or 8V rail without conducting in normal operation. Breakdown occurs at a minimum of 9V, and the clamping voltage is held to 15.23V maximum at the full Ipp — tight enough to protect downstream 12V-rated silicon.
Obsolete — sourcing through independent channels
Littelfuse has marked the 1.5KE10C as obsolete. The DO-201AA axial package is a through-hole form factor that solders into a standard 0.100-inch pitch board layout.