I2C Bi-Directional Logic Level Converter Module

Overview

The I2C Bi-Directional Logic Level Converter Module is a compact, reliable level shifter designed to safely interface devices that run at different logic voltages. Perfect for I2C applications and compatible with UART, SPI and other serial protocols, this 4-channel module enables smooth two-way communication between microcontrollers, sensors and peripherals without damaging low-voltage components.

Key Features

• Bi-directional Conversion: Native two-way translation so both sides can initiate communication without external direction control.
• I2C Compatible (and more): Optimized for I2C bus use but fully usable for UART, SPI, One-Wire and general GPIO level shifting.
• Wide Voltage Range: Supports logic levels from 1.8V up to 5V (typical high side 3.3–5V, low side 1.8–3.3V).
• 4 Independent Channels: Shift up to four separate signal lines simultaneously — ideal for multi-line buses and multi-sensor setups.
• High-Speed Performance: Designed for fast data rates to maintain signal integrity in time-sensitive applications.
• Compact & Easy to Integrate: Small form factor with standard header pins for quick plug-and-play connection.
• Device Protection: Prevents high-voltage signals from harming low-voltage devices, extending component life.

Specifications

• Type: I2C Bi-Directional Logic Level Converter Module
• Input Voltage (High Side): 3.3V to 5V
• Input Voltage (Low Side): 1.8V to 3.3V
• Number of Channels: 4 independent bi-directional channels
• Supported Protocols: I2C, UART, SPI, One-Wire, GPIO
• Operating Temperature: -40°C to +85°C
• Connector: Standard 0.1″ header pins

Applications

• Interfacing 5V microcontrollers (e.g., older Arduino boards) with 3.3V sensors and modules
• Connecting mixed-voltage I2C devices on a single bus
• Level shifting for UART/SPI communications between different voltage domains
• Raspberry Pi, Arduino, ESP32, STM32 and other microcontroller projects
• Prototyping and embedded systems where safe voltage translation is required

Wiring & Usage Tips

• Connect the high-voltage side VCC_H to your higher-voltage supply (e.g., 5V) and VCC_L to the lower-voltage supply (e.g., 3.3V or 1.8V).
• Ensure both ground (GND) rails are common between devices and the module.
• Use pull-up resistors appropriate for your bus and voltage levels when required — many modules rely on external pull-ups for I2C.
• Verify bus speeds and device timing; while the module supports high-speed operation, very high-frequency signals may require validation.

Why Choose This Module?

If you need a dependable, plug-and-play solution for bridging mixed-voltage systems, this I2C Bi-Directional Logic Level Converter Module provides a low-cost, compact and safe way to connect sensors, microcontrollers and peripherals. Its 4-channel design, broad voltage compatibility (1.8V–5V) and support for multiple serial protocols make it a versatile choice for hobbyists and professionals alike.

Compatibility

Works seamlessly with Arduino, Raspberry Pi, ESP8266/ESP32, STM32 and most microcontrollers and sensor modules that operate within the supported voltage ranges.

Note: Images are for illustration only; actual product appearance may vary slightly.