800 V N-channel in a TO-220 — where it fits
The STP80N450K6: The 800 V drain-source breakdown voltage places this part squarely in high-voltage offline applications — power supplies, inverters, and lighting ballasts where the DC bus sits at 400 V or higher.
Input capacitance is 700 pF at 400 V drain-source — a moderate figure that limits the switching speed primarily by the gate drive's ability to charge and discharge the Miller plateau. At 150 °C junction, the on-resistance roughly doubles from the 25 °C value — budget the thermal derating at the full 10 A load to avoid exceeding the 100 W dissipation limit. The TO-220 package with a copper tab can sink 50-60 W with a modest heatsink in still air.