500 V, 7.2 A — what this N-channel MOSFET handles
The STP9NK50Z: The TO-220-3 through-hole package lets you bolt a heatsink directly to the tab, which is how you keep junction temperature under the 150 °C absolute maximum when sinking the full 110 W dissipation.
Gate charge and switching — 32 nC at 10 V
The 4.5 V maximum gate threshold at 100 µA drain current means the device is fully off below 4.5 V on the gate.
Package and thermal — TO-220 with 110 W dissipation ceiling
The TO-220-3 package has a metal tab that is electrically common with the drain. In practice, derate from 110 W based on your heatsink's thermal resistance and the ambient temperature.