Item discontinued. Please check PCA9548A 1-to-8 I2C Multiplexer Module for the newer alternative version.

The TCA9548A module allows a single microcontroller to communicate with up to eight I2C devices, even if they share the same address. It acts as a switchable gateway, routing I2C commands to one of eight downstream channels, making it essential for sensor arrays, display clusters, and address-conflict scenarios.

Specifications

• Chipset: TCA9548A
• Interface: I²C (SDA/SCL)
• Operating Voltage: 1.65 V to 5.5 V
• Logic Level Compatibility: 1.8 V, 3.3 V, and 5 V systems
• I²C Address Range: 0x70 to 0x77 (configurable via A0–A2 pins)
• Max Clock Frequency: 400 kHz
• Channels: 8 independent I²C buses
• Reset Pin: Active-low input for software reset

Features

• Enables communication with multiple I²C devices sharing the same address
• Supports up to 8 downstream I²C channels
• Configurable I²C address via hardware jumpers (A0, A1, A2)
• Breadboard-friendly breakout with pull-up resistors and decoupling capacitors
• Compatible with Arduino, ESP32, Raspberry Pi, STM32, and other I²C hosts
• Ideal for sensor arrays, multi-display setups, and modular I²C expansion
• Supports cascading multiple modules for up to 64 devices on one bus