TO-220FP full-pack — one less insulator to worry about
The TO-220FP is the fully isolated version of the standard TO-220. The plastic body extends around the back tab, so the mounting surface is electrically isolated from the drain. It simplifies assembly and reduces BOM count, though the thermal resistance junction-to-case is higher than a standard TO-220 because the plastic adds a thermal barrier. The 30 W dissipation ceiling reflects that; if you need to push more current, the non-isolated TO-220 sibling (STP20N65M5) would run cooler for the same load.