PCA9306 Voltage-Level Translator Texas Instruments PCA9306 voltage-level translator allows bidirectional voltage translations between 1.2V and 5V without the use of a direction pin. The low ON-state resistance of the switch allows connections to be made with minimal propagation delay. The TI PCA9306 voltage-level translator is I²C and SMBus compatible and enables a system designer to isolate two halves of a bus, allowing more I²C devices or longer trace length to be accommodated.