The PCA9306 level conversion module is a bidirectional voltage converter designed for I²C/SMBus, which can seamlessly connect different voltage devices from 1.2V to 5V, such as 3.3V MCU (such as STM32, ESP8266, Raspberry Pi) and 5V sensors (such as OLED, BMP180, MPU6050). It uses TI (Texas Instruments) PCA9306 chip, which is stable and reliable, supports 400kHz high-speed I²C communication, does not require direction control, and is plug-and-play! Bidirectional conversion: Wide voltage supports any combination of 1.2V~5V (such as 3.3V↔5V, 1.8V↔3.3V), and efficiently manages bidirectional voltage conversion between 5V and 3.3V to ensure reliable data transmission and device functionality. Easy to integrate: Integrated PCB, straight-in pin headers, convenient breadboard/Dupont line connection, and compact breakout board design, which can be directly integrated into your existing projects without complicated wiring or setup. High compatibility: This PCA9306 I²C level converter module is designed for seamless communication between devices with different voltage levels. The dual-channel design can simultaneously convert the two I²C signal lines SCL (clock) and SDA (data), making it ideal for a variety of I²C applications. Wide application: Bidirectional automatic conversion, no additional control signals required, and automatic identification of data transmission direction are very suitable for developers using microcontrollers, sensors and other electronic components that need to adjust voltage levels. Chip model PCA9306DCUR (TI) Input voltage range 1.2V ~ 5V (VREF1 ≤ VREF2) Maximum frequency 400kHz (I²C Fast Mode) Conversion direction Bidirectional automatic switching Interface type I²C (SCL + SDA) Operating temperature -40°C ~ +85°C Pin definition VREF1 Low voltage side power supply (such as 3.3V) SCL1 Low voltage side I²C clock line SDA1 Low voltage side I²C data line GND Ground SDA2 High voltage side I²C data line SCL2 High voltage side I²C clock