Official 7Semi-TCA9548A I2C Multiplexer Board – 8-Channel I2C Bus Switch

The 7Semi TCA9548A I2C MUX Board is a compact and efficient 8-channel I²C multiplexer designed to eliminate address conflicts and significantly expand I²C connectivity in embedded systems. Built around the reliable Texas Instruments TCA9548APWR, this board allows a single I²C master to communicate with up to eight independent downstream I²C buses, making it an essential tool for sensor-dense and modular applications.

Many I²C sensors and peripherals share fixed addresses, which can limit system scalability. The TCA9548A solves this problem by enabling software-controlled channel selection, allowing the master controller to activate one channel at a time. Each downstream bus (SD0–SD7 / SC0–SC7) is electrically isolated, ensuring clean communication and preventing address collisions between identical devices.

The board operates at low voltage levels and is fully compatible with 3.3V logic systems, making it ideal for modern microcontrollers and single-board computers such as Raspberry Pi, STM32, ESP32, and other I²C-enabled platforms. It also supports multi-master and multi-slave configurations, providing flexibility for advanced embedded architectures.

Designed with ease of use in mind, the 7Semi TCA9548A I2C MUX Board can be used as a standalone module or stacked with other boards for scalable system expansion. A dedicated reset pin ensures reliable startup and recovery during fault conditions or power cycling.

Thanks to its compact footprint, low power consumption, and robust design, this I²C multiplexer is perfect for robotics, IoT devices, environmental monitoring systems, data acquisition platforms, and rapid prototyping setups. Whether you’re building a complex sensor array or expanding an existing I²C bus, the TCA9548A offers a clean, reliable, and efficient solution.

For Datasheet click Here.

Features

• 8-Channel Bidirectional I²C Switching

• Power Input – 3.3V VIN (logic-level compatible)

• I²C Controlled Channel Selection with dedicated address bits

• Reset Logic – Active-low RST input for flexible startup control

• Compatible with SMBus and Standard/Fast I2C (up to 400kHz)

• Low Voltage Logic – Compatible with 3.3V logic levels

• Operating Voltage: 1.65V – 5.5V

Applications

• Connect multiple I²C devices with the same address on a single controller

• Interface with multi-sensor arrays in smart farming, weather stations, or industrial IoT

•  Perform I²C bus isolation and debugging during development and testing

• Control separate smart home or building automation zones with identical sensors

• Expand I²C peripherals in robots, drones, and embedded systems

• Switch between I²C-controlled displays, actuators, and EEPROM banks

Package Includes

• 1x Official 7Semi-TCA9548A I2C Multiplexer Board