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PCF8574 I2C IO Expander

PCF8574 I2C IO Expander
PCF8574 I2C IO Expander
  • Availabilty: Directly available
  • Model: PCF8574EXPMOD
  • SKU: 001084
Ex Tax: €2.07

Do you have too few IO pins, but do you have an I2C bus at your disposal? Then you can use this module to create more (standard) pins.
De PCF8574 works on both 3.3V and 5V. (output equal to input voltage)


  • Voltage: 2.5 - 6V DC
  • Jumpers present to set I2C address
  • 8 extra pins per module
  • Pin can be used as input and output
  • Pull-up resistors for I2C bus already present
  • Possible to link multiple modules together for more pins (up to 8 modules)
  • Chip:  PCF8574(T) or PCF8574A(T) ("A" version has a different I2C address!)

See the datasheet for more information: PCF8574/PCF8574A

Check this page for the library and manual for Arduino: A class for PCF8574

Note: High output signals of 10μF or higher require an external pull-up resistor. Low output signals do not require a resistor and can provide 25mA. See chapters 10.1 and 13 in the datasheet for further details.

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