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I/O Expander Module PCF8574T


The PCF8574 IO Expansion Board is used as remote 8-bit I/O expander for I2C-bus. Up to 8 PCF8574, IO Expansion Board can be connected to the I2C-bus, providing up to 64 I/O ports. CityTech BD 

The PCF8574 IO Expansion Board features I2C pinheader on one side, and I2C connector on the opposite side. Hence, it’s more flexible to connect the board to your development system. The board also supports I2C cascading, allowing the use of multi module connected to the I2C bus at the same time by connecting the pinheader and connector. CityTech BD 


  1. Based on PCF8574 Chip
  2. I2C Interface
  3. 8-bit parallel port
  4. Can be used with Arduino as well as Raspberry Pi.
General Specification
Operating Voltage (VDC)3 ~ 5
Ports8-bit parallel port
Length (mm)48
Width (mm)16
Height (mm)15
Weight (gm)5
Shipment Weight0.01 kg
Shipment Dimensions6 × 10 × 2 cm

Package Includes:

1 x PCF8574T I2C I/O Extension Board

CityTech BD CityTech BD CityTech BD CityTech BD CityTech BD CityTech BD 


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