The STI33N65M2 is an N-channel power MOSFET from STMicroelectronics' MDmesh™ M2 series, rated for 650 V drain-to-source and 24 A continuous drain current at 25 °C case temperature. It comes in a through-hole I2PAK (TO-262) package — the long-lead version that lets you bolt it to a heatsink without worrying about board clearance. The 140 mOhm typical on-resistance at 10 V gate drive keeps conduction losses manageable in a 190 W dissipation budget, and the 41.5 nC gate charge means a standard gate driver can switch it without a lot of dead-time compensation.
Package and mounting — I2PAK field note
The I2PAK (TO-262) package has three leads that go through the board, plus a metal tab that gets screwed to a heatsink.