4-Channel IIC I2C Logic Level Converter Module is a bi-directional voltage translator designed to safely connect 3.3V and 5V devices on the same bus. It is perfect for I2C / IIC communication between microcontrollers like ESP32 / ESP8266 / STM32 (3.3V) and sensors/modules that use 5V logic such as Arduino UNO or 5V I2C displays.

Key Features

• 4 independent channels for signal level shifting

• Bi-directional translation (works both directions automatically)

• Ideal for I2C (SDA, SCL) and also supports other digital signals

• Works with common voltage pairs: 1.8V / 3.3V / 5V (module dependent)

• Simple connections: HV, LV, GND + signal pins

• Protects 3.3V devices from 5V logic signals

Full Specifications (Typical)

Electrical

• Channels: 4

• Translation Type: Auto bi-directional (MOSFET-based)

• Low-Voltage Side (LV): typically 1.8V–3.3V (depends on setup)

• High-Voltage Side (HV): typically 3.3V–5V

• Level Shift Signals: SDA/SCL or any digital I/O

• Required Connections:

  • HV = high-side voltage (e.g., 5V)

  • LV = low-side voltage (e.g., 3.3V)

  • GND common ground

  • HV1–HV4 / LV1–LV4 signal pairs

Compatibility

• I2C / IIC bus

• UART (TX/RX), SPI lines, GPIO signals (best for open-drain / low speed)

• Compatible with: Arduino, ESP32, ESP8266, STM32, Raspberry Pi (3.3V I/O)

Notes for Best Use

• For I2C: connect SDA + SCL through two channels

• Keep wires short for stable I2C communication

• I2C pull-up resistors are often included on modules; if not, use pull-ups as needed

Applications

• Connecting ESP32 (3.3V) to 5V I2C LCD/OLED modules

• Using 5V sensors with 3.3V microcontrollers

• Mixed-voltage robotics and automation systems

• Protecting Raspberry Pi I/O when interfacing with 5V logic

Used In

• Smart home and IoT projects

• Sensor integration (BME280, MPU6050, RTC modules, displays, etc.)

• Robotics controllers and embedded systems

Package Includes

• 1× 4-Channel IIC/I2C Logic Level Converter Module