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Main image of MCP23017 I2C Interface 16-Bit I/O Expansion Module, IIC to GPIO Converter Board, Max 25mA Drive Current, Compatible with C51 Microcontroller and Electronic Development Projects

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MCP23017 I2C Interface 16-Bit I/O Expansion Module, IIC to GPIO Converter Board, Max 25mA Drive Current, Compatible with C51 Microcontroller and Electronic Development Projects

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Built-in MCP23017 chip, I2C communication, expands 16 independent GPIO ports
IIC to GPIO conversion, maximum single pin drive current reaches 25mA
Supports multiple modules cascading to expand more I/O resources conveniently
Stable power supply design, widely matched with C51 and other mainstream MCUs
Standard pin header layout, easy wiring for development experiment and DIY project

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This I/O expansion module adopts MCP23017 chip, utilizing I2C bus to extend 16-bit general-purpose input and output ports. It can effectively solve the problem of insufficient IO resources of microcontrollers.

Each GPIO pin provides up to 25mA driving capability. Multiple modules can be cascaded by setting different I2C addresses to achieve multi-channel expansion. The module has reliable power processing circuit and stable signal transmission.

It has great compatibility and works perfectly with C51 series microcontrollers, Arduino and other control platforms. Standard pin terminals facilitate quick connection on breadboards and circuit boards.

Suitable for intelligent hardware development, sensor array control, LED light group driving and electronic experiment teaching. Please confirm communication protocol before purchase.

Additional Information
First Listed on Newegg	July 22, 2026

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Return for refund within: 30 days
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Item#: 9SIC4P5M211019