The STP8N65M5: The 15 nC typical gate charge and 690 pF input capacitance are low enough that a standard gate driver IC can switch it without excessive drive current.
Obsolete — plan your BOM accordingly
STMicroelectronics lists the STP8N65M5 as obsolete. For a new design, you would not qualify this part — the official ST successor (if one exists) is not recorded in the available lifecycle data, so the practical path is to find a functionally equivalent N-channel MOSFET in the same 650 V, 7 A class with a TO-220 package.
Package and thermal — TO-220 through-hole
Housed in a standard TO-220-3 through-hole package, the STP8N65M5 mounts into a PCB or heatsink with a single screw hole. The maximum power dissipation is 70 W at case temperature, so a heatsink is expected for any continuous load above a few amps. The junction temperature rating of 150°C sets the thermal derating limit — keep the case temperature below that margin when sizing the heatsink.