Raspberry Pi Pinout

BCM 2 (I2C Data)

Alt0Alt1Alt2Alt3Alt4Alt5
I2C1 SDASMI SA3DPI VSYNCAVEOUT VSYNCAVEIN VSYNC
  • Physical pin 3
  • BCM pin 2
  • Wiring Pi pin 8
  • BCM pin 0 on Rev 1 ( very early ) Pi

SDA (i2c Data) is one of the i2c pins on the Pi, learn more about i2c.

SDA includes a fixed, 1.8 kohms pull-up to 3.3v, which means this pin is not suitable for use as a general purpose IO where no pullup resistor is desired.