650V 15A CoolMOS — what this part is
The Infineon SP000681054 is a CoolMOS N-channel power MOSFET, also marked as SPP15N65C3HKSA1. It is a 650V, 15A device in a TO-220 package, designed for high-efficiency switched-mode power supplies, PFC stages, and inverter topologies where low conduction and switching losses matter. The CoolMOS C3 family uses a charge-compensation structure that reduces RDS(on) per silicon area compared to standard planar MOSFETs, which keeps the die smaller and the gate charge lower for a given on-resistance.