The SPA08N50C3XKAS1: Housed in a through-hole TO-220-3 Full Pack package with an isolated mounting hole. The 560 V drain-source rating provides margin for universal AC input with reflected voltage and leakage-inductance spikes.
The 560 V Vdss is the maximum drain-to-source voltage the device can block in the off state. In a typical flyback converter, the primary-side MOSFET sees a reflected voltage plus a ringing spike. The 560 V rating gives derating margin for reliable operation over line and load transients. In a real enclosure where the case temperature rises, the current must be derated per the thermal curve in the datasheet. The 32 W power dissipation ceiling at the case sets the heatsink requirement.
For BOM planning, this part carries no imminent LTB risk, and the CoolMOS™ family has broad second-source coverage from other manufacturers offering pin-compatible 560 V / 7 A–8 A TO-220 Full Pack MOSFETs. If dual-sourcing is a requirement, qualify an alternate now rather than during an allocation event. The PG-TO220-3-111 supplier package is the Infineon-specific variant of the standard TO-220 Full Pack.