Interactive chip reference
LM317 TO-220-3 pinout
LM317 3-pin TO-220-3 pinout. Adjustable positive voltage regulator, 1.25V–37V output, 1.5A (TO-220)
Pin reference
| Pin | Name | Function | Group |
|---|---|---|---|
| 1 | ADJ | Adjust — sets Vout via external resistor divider (Vref = 1.25V) | control |
| 2 | VIN | Unregulated input — metal tab also = VIN | power |
| 3 | VOUT | Regulated output voltage (1.25V–37V) | output |
View the interactive LM317 package diagram and labeled pin details on WhichPin.