MCP23017 IO Expansion Board, Expands 16 I/O Pins


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MCP23017 IO Expansion Board, I2C Interface, Expands 16 I/O Pins


The MCP23017 IO Expansion Board expands 2 signal pins as 16 I/O pins based on the I2C bus, up to 8 MCP23017 IO Expansion Board can be used at the same time, providing up to 128 I/O pins, it is compatible with both 3.3V and 5V levels.


  • I2C controlled, expands 2 signal pins as 16 I/O pins 
  • I2C address configurable by shorting the A0/A1/A2 jumpers
  • Provides two connector options: PH2.0 terminal and/or solder pads, allows multi I2C modules to be stacked
  • Onboard voltage translator, compatible with 3.3V/5V level
  • Comes with development resources and manual (examples for Raspberry Pi / micro:bit / Arduino / STM32)


  • Operating voltage: 5V/3.3V
  • Interface: I2C
  • Interrupt pins: INTA, INTB
  • Expansion I/Os: 16
  • Dimension: 38mm × 23mm
  • Mounting hole size: 2.0mm

Interface Definition

VCC Power supply, 3.3V/5V
GND Ground
SDA I2C data line
SCL I2C clock line
INTA PA group interrupt output
INTB PB group interrupt output


MCP23017 IO Expansion Board dimensions

Development Resources

Wiki :


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MCP23017 IO Expansion Board, Expands 16 I/O Pins

MCP23017 IO Expansion Board, Expands 16 I/O Pins

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