TCA9548A 1-to-8 channel I2C multiplexer module with labeled pins and integrated circuit

TCA9548A Pre-Soldered 1-to-8 I2C 8-Channel Multiplexer Module

SKU NA339

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TCA9548A 1-to-8 I2C multiplexer module expands one I2C bus into 8 selectable channels for sensors, displays, and EEPROMs, resolving address conflicts in Arduino, ESP32, robotics, home automation, and prototyping.

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Overview

Product Overview

TCA9548A 1-to-8 I2C 8-channel multiplexer module lets you expand a single I2C bus into eight selectable channels, making it easy to connect multiple sensors, displays, EEPROMs, or other peripherals while isolating traffic between devices. Built around the TCA9548A chip, it is ideal for resolving I2C address conflicts and managing complex multi-device setups in Arduino, Raspberry Pi, ESP32, and other microcontroller or SBC projects. This I2C multiplexer module is a practical choice for robotics, home automation, test fixtures, and general electronics prototyping where reliable I2C bus routing is needed. The header pins ship pre-soldered, so it works out of the box with no soldering required.

Questions & answers

Frequently asked questions

This I2C multiplexer is intended for Arduino, Raspberry Pi, ESP32, and other microcontroller or single-board computer projects that use an I2C bus. It helps one controller communicate with peripherals spread across up to eight selectable I2C channels.
Yes. The header pins ship pre-soldered, so you can connect it to jumper wires, breadboards, or compatible project wiring without soldering the module first. You still need to wire power, ground, and I2C lines correctly.
The module uses the I2C protocol and routes one main I2C bus to eight selectable downstream channels. It is commonly used when multiple I2C devices share the same address or when separate bus segments need isolated communication.
A common use is connecting several identical I2C sensors that have the same fixed address. The multiplexer lets the controller select one channel at a time, making projects like robotics, home automation, test fixtures, and sensor arrays easier to manage.
If devices are not detected, check that the controller is selecting the correct multiplexer channel before scanning or reading each peripheral. Also confirm wiring continuity, shared ground, and that each connected I2C device is powered appropriately for your system.

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What's included

Features & Specs

I2C Bus ExpansionExpands one I2C bus into 8 selectable downstream channels for multi-device projects.

TCA9548A ChipBuilt around the TCA9548A I2C multiplexer IC for reliable channel switching.

Address Conflict FixHelps resolve I2C address conflicts when using multiple devices with the same address.

Peripheral SupportWorks with I2C sensors, displays, EEPROMs, and other peripherals on separate channels.

Device IsolationIsolates I2C traffic between channels to simplify complex bus routing and management.

Controller CompatibilityCompatible with Arduino, Raspberry Pi, ESP32, and other microcontroller or SBC platforms.

Project Use CasesSuitable for robotics, home automation, test fixtures, and electronics prototyping.

Reference

Documents

Full Product Manual TCA9548A 1-to-8 I2C 8-Channel Multiplexer Module | ShillehTek Product Manual In-depth setup guide with wiring, code examples, and troubleshooting.

Datasheet - TCA9548A I2C Multiplexer

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