MCP23017 IO Expansion Board

WaveshareSKU: WAV-15391
Sale price £23.42
incl. VAT
excl. VAT
In stock

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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 Boards can be used at the same time by selecting different addresses for each module, providing up to 128 I/O pins!

This module is compatible with both 3.3V and 5V levels. Examples are provided for Raspberry Pi, micro:bit, Arduino and more!


  • 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
  • Online 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

Package Contents

  • 1x MCP23017 IO Expansion Board
  • 1x PH2.0 20cm 6-pin cable

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