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

The 7Semi TCA9548A I2C Multiplexer Board is an 8-channel I²C bus switch based on the TCA9548A IC. It allows a single master I²C bus to connect to one or multiple downstream I²C channels, solving address conflicts and enabling clean bus isolation. Each channel can operate at different voltage levels, making it ideal for complex sensor networks, embedded systems, and modular electronics.

Technical Specification:

• Supply Voltage: 1.65 V to 5.5 V
• Number of Channels: 8 independent I²C buses
• Supported I²C Speeds: 100 kHz (Standard) and 400 kHz (Fast Mode)
• Address Pins: A0, A1, A2 (up to 8 multiplexers on one bus)
• Voltage Translation: Supports multiple I²C logic levels
• Input Tolerance: 5 V tolerant
• Reset Pin: Active-low RESET
• Operating Temperature: –40 °C to +85 °C
• IC Package: TSSOP-24 / QFN type depending on board version

Features:

• 1-to-8 bidirectional I²C switching
• Eliminates I²C address conflicts
• Allows selection of one or multiple channels at once
• Supports mixed-voltage I²C systems
• Hardware address configuration for system expansion
• Low power consumption
• RESET pin for bus recovery
• Compact and ready-to-use breakout module

Applications:

• Multiple identical I²C sensors in one project
• Sensor arrays and modular sensing platforms
• Mixed-voltage I²C communication
• Isolation of noisy peripherals
• Embedded and IoT systems requiring bus expansion
• Robotics and automation sensor hubs