IRF3205 MOSFET - 55V 110A N-Channel HEXFET Power MOSFET (TO-220)

Small transistors like the 2N2222 or BC547 are fine for switching LEDs and low-current loads, but serious current-handling jobs like driving a brushed DC motor directly, building a custom motor controller, or switching a high-current battery pack call for a dedicated power MOSFET instead. The IRF3205's 110A current rating and robust TO-220 package give it enormous headroom for exactly these high-current switching jobs, commonly showing up in DIY electric vehicle and e-bike controllers, battery disconnect and protection circuits, and custom H-bridge motor driver builds where off-the-shelf driver boards don't have the current capacity needed. Its low on-resistance also helps it run cooler than a less efficient switch would at the same current, which matters for anything run continuously under heavy load.