TCA9548A 1-to-8 I2C Multiplexer Module IIC 8-Channel Expansion Board

The TCA9548A 1-to-8 I2C Multiplexer Module allows you to connect multiple I2C devices with the same address to a single I2C port—ideal for Arduino, ESP32, Raspberry Pi, and other microcontroller projects.
This module solves I2C address conflicts and expands your system’s capability to handle up to 64 identical I2C devices when cascading multiple boards.

Key Features

• TCA9548A Chip —Stable I2C switching with eight bidirectional channels.
• 1-to-8 Expansion —Each board provides 8 independent I2C channels.
• Address Selectable (0x70–0x77) —Supports cascading up to 8 expanders.
• Wide Operating Voltage —1.65V–5.5V; ideal for 1.8V, 3.3V, and 5V systems.
• 400kHz I2C Clock —Compatible with fast-mode I2C communication.
• Level Shifting Support —Different voltage buses can coexist across channels.
• Reset & Protection —Active-low reset, no glitch during power-up, SMBus compatibility.
• Built-In Pull-Up Resistors —/RESET, SDA, SCL, A0–A2 pins already include 10K pull-ups.

Applications

• Projects with multiple identical sensors
• Robotics & automation
• Multi-channel data acquisition
• IoT devices
• Prototyping and development boards

Product Specifications

• Chipset: TCA9548A
• Interface: I2C / IIC
• Address Range: 0x70–0x77
• Operating Voltage: 1.65V–5.5V
• I2C Clock: 0–400kHz
• Operating Temperature: −40°C to +85°C
• Board Size: 31.5mm × 21.4mm
• Mounting Holes: 2 × M3

Package Includes

• 1 × TCA9548A I2C Multiplexer Breakout Board