ITEM NAME:TCA9548A I2C IIC Multiplexer Breakout Board 8 Kanal Erweiterungsplatin O Cy Description: Packaged included:.Are you out of luck?. You would be, if you didn't have this ultra-cool TCA9548A I2C 1-to-8 I2C multiplexer. 1 TCA9548A I2C Multiplexer Breakout board. The chip itself is 3V and 5V compliant so you can use it with any logic level.