The I2C Bi-Directional Logic Level Converter 4 Channel module is designed to safely interface devices operating at different logic voltage levels. It allows seamless two-way communication between low-voltage (3.3 V) and high-voltage (5 V) systems, making it ideal for I2C, SPI, UART, and general digital signal level shifting. This module is widely used in Arduino, ESP32, Raspberry Pi, and mixed-voltage embedded projects.
Core Module Specifications
• Module Type: Bi-directional logic level shifter
• Channel Count: 4 independent channels
• Signal Direction: Automatic bi-directional
• Supported Protocols: I2C, SPI, UART, GPIO
Electrical & Interface
• Low-Voltage Side (LV): 1.8 V – 3.3 V
• High-Voltage Side (HV): 3.3 V – 5 V
• Interface Pins: LV, HV, GND, LV1–LV4, HV1–HV4
• Level Shifting Method: MOSFET-based bi-directional conversion
• External Pull-Ups: Required for I2C lines
Performance Characteristics
• Reliable two-way signal translation
• Suitable for open-drain and push-pull signals
• Fast switching for low-speed digital buses
• Stable operation across mixed-voltage systems
Physical Characteristics
• Module Type: Compact PCB-mounted converter
• Form Factor: Breadboard-friendly
• Pin Labeling: Clearly marked for easy wiring
• Lightweight and space-efficient design
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• Raspberry Pi
• STM32 and other MCUs
• 3.3 V sensors with 5 V controllers
Key Advantages
• Safe voltage level translation
• Automatic bi-directional operation
• No configuration or software required
• Essential for mixed-voltage I2C systems
Technical Insights
• Best suited for low-to-medium speed signals
• Pull-up resistors required on I2C lines
• Not recommended for high-frequency signals
• Common ground between both sides is mandatory
Applications
• I2C sensor interfacing (3.3 V ↔ 5 V)
• SPI and UART level shifting
• GPIO voltage protection
• Raspberry Pi to Arduino interfacing
• Embedded and IoT development projects
Pro Tip
• Always connect common GND first
• Match LV and HV correctly before powering
• Use short signal wires for clean communication
• Ideal for SDA/SCL level shifting in I2C buses
Package Includes
• 1 × I2C Bi-Directional Logic Level Converter – 4 Channel