Adafruit PCA9546 4-Channel STEMMA QT / Qwiic I2C Multiplexer

The Adafruit PCA9546 4-Channel STEMMA QT / Qwiic I2C Multiplexer allows you to connect up to four I2C devices with the same address to a single microcontroller. This efficient multiplexer functions as a routing manager, directing data to the desired I2C port simply through command.

Features include adjustable I2C address settings (0x70 to 0x77) and compatibility with existing TCA9546 library and code. The board is equipped with five JST SH 1mm connectors—1 input and 4 outputs—and also includes a breadboard option for versatile connectivity.

Compatible with both 3V and 5V systems, the onboard 3.3V 500mA regulator can adjust power and logic levels, making it easy to integrate with various setups like Arduino. The design includes mounting holes for seamless installation into any system, along with an LED indicator to ensure connectivity. All STEMMA QT and Qwiic standards are maintained, extending its utility with other compatible boards and parts.