TCA9548A 8-Channel I2C Multiplexer Breakout Board for Arduino

TCA9548A 8-Channel I2C Multiplexer Breakout Board

Expand your microcontroller projects effortlessly with the CJMCU-9548 TCA9548A I2C Multiplexer Development Board. This compact breakout board lets you connect up to 8 I2C devices sharing the same address to a single microcontroller — eliminating address conflicts and simplifying complex multi-sensor builds. Whether you're working with Arduino, Raspberry Pi, or any other I2C-compatible platform, this board is the clean, reliable solution for scaling your electronics projects.

Key Features

• 8 Independent I2C Channels: Connect up to 8 I2C peripherals — each channel is individually controlled via the I2C bus using bidirectional switching.
• Address Conflict Resolution: Easily connect multiple sensors or modules that share the same I2C address without any hardware modifications.
• Plug-and-Play Compatibility: Works seamlessly with Arduino, Raspberry Pi, ESP32, STM32, and other popular development platforms.
• Cascadable Design: Chain multiple TCA9548A boards together for even greater expansion — up to 64 additional I2C devices on a single bus.
• Compact & Lightweight: Measures just 32.00 × 22.00 × 3.00 mm (1.26 × 0.87 × 0.12 in), making it ideal for space-constrained enclosures and prototypes.
• Bidirectional Voltage Translation: Supports both 3.3V and 5V logic levels, providing flexibility across different hardware ecosystems.
• Configurable Address Pins: Three onboard address selection pins (A0, A1, A2) allow up to 8 boards to coexist on one bus.

Specifications

• Chip: TCA9548A
• Interface: I2C / IIC
• Number of Channels: 8
• Operating Voltage: 1.8V – 5.5V
• Default I2C Address: 0x70 (configurable up to 0x77)
• Dimensions: 32.00 × 22.00 × 3.00 mm
• Compatible Platforms: Arduino, Raspberry Pi, ESP32, STM32, and more

What's in the Box

• 1 × CJMCU-9548 TCA9548A I2C Multiplexer Breakout Board

Who Is This For?

This board is a must-have for hobbyists, students, engineers, and makers who build multi-sensor systems, robotics, IoT devices, or any project requiring multiple I2C components. It's a small board with a big impact on your workflow.

For more information on I2C bus standards and best practices in embedded systems, visit the NIST Publications Library for technical standards references.

Frequently Asked Questions

Q: What does the TCA9548A I2C Multiplexer Breakout Board do?

A: The TCA9548A is an 8-channel I2C multiplexer that allows you to connect up to 8 I2C devices — even ones that share the same I2C address — to a single microcontroller's I2C bus. Each channel is independently enabled via the I2C interface, so your controller can communicate with each device without address conflicts.

Q: Is the CJMCU-9548 TCA9548A compatible with Arduino and Raspberry Pi?

A: Yes! The TCA9548A multiplexer breakout board is fully compatible with Arduino, Raspberry Pi, ESP32, STM32, and virtually any microcontroller or single-board computer that supports the I2C/IIC protocol. It supports both 3.3V and 5V logic levels for broad compatibility.

Q: Can I chain multiple TCA9548A boards together?

A: Absolutely. The CJMCU-9548 features three configurable address pins (A0, A1, A2), allowing up to 8 boards to be used on the same I2C bus simultaneously. This means you can expand your system to communicate with up to 64 additional I2C devices from a single master controller.

Q: How do I select which I2C channel is active on the TCA9548A?

A: You communicate with the TCA9548A over I2C and write a control byte to it specifying which channel(s) to enable. Channels are individually selectable via bits in the control register, and multiple channels can be active simultaneously if needed.

Q: What are the dimensions of this breakout board?

A: The CJMCU-9548 TCA9548A breakout board measures 32.00 × 22.00 × 3.00 mm (approximately 1.26 × 0.87 × 0.12 inches), making it very compact and easy to integrate into any project enclosure or breadboard setup.