4-Channel Bi-Directional Logic Level Converter 3.3V to 5V Shifter Module for Arduino and I2C

Product Description The 4-Channel Bi-Directional Logic Level Converter is a specialized interface module designed to bridge the gap between devices operating at different logic voltages. It safely steps down 5V signals to 3.3V and steps up 3.3V signals to 5V simultaneously, making it indispensable for connecting 5V Arduino boards with 3.3V sensors, displays, or Bluetooth modules like the HC-06. Unlike simple voltage dividers, this module is fully bi-directional, supporting high-speed communication protocols like I2C without data loss.

Key Features

• Full Bi-Directional Shifting: Automatically detects data flow direction across 4 independent channels.

• I2C Optimized: Features necessary pull-up resistors on-board, making it perfect for I2C (SDA/SCL) bus lines.

• Breadboard Ready: Compact PCB design with standard 2.54mm header spacing for easy prototyping.

• Multi-Voltage Support: Compatible with 1.8V and 2.8V logic, in addition to the standard 3.3V and 5V levels.

• Safe Isolation: Protects sensitive 3.3V microcontrollers (like ESP32 or Raspberry Pi) from accidental 5V surges.

Technical Details

• MOSFET-Based Switching: Uses high-speed BSS138 N-channel enhancement mode Field Effect Transistors for logic translation.

• High-Speed Performance: Capable of handling data rates suitable for standard and fast-mode I2C (up to 400kHz).

• Power Isolation: Features independent power rails for High Voltage (HV) and Low Voltage (LV) sides.

• Integrated Pull-ups: Includes 10k Ohm pull-up resistors on every channel to maintain signal integrity in open-drain circuits.

• Independent Channels: All four channels are electrically isolated, allowing for different signal types (e.g., 2 for I2C, 2 for UART).

• Operating Temperature: Industrial grade stability from -40°C to +85°C.

• Common Ground Requirement: Designed for systems where the GND of both voltage domains is tied together.

• Low Quiescent Current: Draws minimal power, making it ideal for battery-operated IoT devices.

• Lead-Free Construction: Fully RoHS compliant for modern electronic manufacturing standards.

• Small Footprint: Ultra-miniature design allows it to fit into tight enclosures or small-scale robotics projects.

• Low Insertion Loss: Maintains sharp signal edges (rise/fall times) for reliable digital transitions.

• Input Overvoltage Protection: The MOSFET structure provides a layer of protection against transient voltage spikes.

• Solder-Friendly Pads: Gold-plated or high-quality tin pads ensure reliable solder joints for headers.

• Versatile Application: Can be used for SPI (MOSI, MISO, SCK, CS) by utilizing all four channels.

• Stable Switching: Prevents "floating" logic states by ensuring signals are pulled to the respective VCC rails.