TO-220 is the standard through-hole power package for voltage regulators (78xx, 79xx, LM317), power MOSFETs, transistors, and triacs. The metal tab provides heatsinking and is typically connected to the middle pin or separate ground.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | Pin 1 | Varies: Base/Gate or Input | I/O |
| 2 | Pin 2 | Varies: Collector/Drain or Output | I/O |
| 3 | Pin 3 | Varies: Emitter/Source or Adjust | I/O |
| TAB | Tab | Usually Collector/Drain/Output (check datasheet) | PWR |
TO-220 is the standard through-hole power package for voltage regulators (78xx, 79xx, LM317), power MOSFETs, transistors, and triacs. The metal tab provides heatsinking and is typically connected to the middle pin or separate ground.