LM7805 Pinout
LM7805 Voltage Regulator · Classic 5V linear regulator; input ≤35V.
TO-220 with the front (labeled side) toward you and the pins down, left to right is IN-GND-OUT. The heatsink tab is connected to GND.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IN · Vin | Power | Input voltage (7–35V) |
| 2 | GND | GND | Ground (connected to the heatsink tab) |
| 3 | OUT · Vout | Output | Regulated +5V output |
How to read the LM7805 pinout
- 01
Find pin 1
One end of the chip has a half-circle notch or a dot; with the notch facing up, the top-left pin is pin 1.
- 02
Count counter-clockwise
Count counter-clockwise from pin 1: go down the left side first, then up the right side from the bottom.
- 03
Check the table below
Look up each pin's function by number in the table below; power/ground are color-coded, and alternate-function signals are in parentheses.
Frequently asked questions
What is the LM7805 pin order?
With the front (printed face) toward you and the pins down, left to right is IN-GND-OUT. The metal heatsink tab is internally connected to GND.
Do I need capacitors?
A 0.33µF bypass capacitor on the input and 0.1µF on the output are recommended for stability and to suppress oscillation (see the datasheet).
How much current can it output / does it need a heatsink?
About 1A; the dissipation (dropout × current) all turns into heat, getting hotter as the input voltage rises, so high current needs a heatsink.
Pinout data comes from TI/onsemi LM7805 datasheet (standard TO-220 numbering). Refer to the actual device datasheet as authoritative for the pinout.