7Semi BSS138 4-Ch I2C Bi-directional Logic Level Converter Breakout

The 7Semi BSS138 4-channel logic level converter is a compact breakout board that enables safe and reliable bi-directional voltage level shifting between devices operating at different logic levels. Designed primarily for I2C communication, it uses BSS138 N-channel MOSFETs with pull-up resistors, allowing for smooth signal translation between low- and high-voltage domains.

Technical Specification:

• Channels: 4 bidirectional channels
• Voltage Range (Low Side): ~1.8 V and above
  
• Voltage Range (High Side): Up to ~10 V
  
• MOSFET Type: BSS138 N-channel
  
• Pull-up Resistors: 10 kΩ on each line
  
• Interface Compatibility: I2C, UART/TTL, slow SPI (<2 MHz)
  
• Board Type: Assembled breakout module with 6-pin headers
  
• Dimensions: Compact size suitable for breadboard/prototyping

Features:

• Bidirectional level shifting using MOSFETs
  
• Supports a wide voltage range (1.8 V to 10 V)
  
• Works seamlessly with I2C, UART, and other digital signals
  
• Pre-soldered headers for easy integration into breadboards
  
• No need for manual direction control
  
• Plug-and-play functionality for mixed-voltage setups
  
• Low cost and ideal for DIY and embedded applications

Applications:

• Interfacing 3.3 V and 5 V devices (e.g., Arduino, Raspberry Pi, ESP8266)
• Level shifting between low-voltage MCUs and high-voltage peripherals
  
• I2C bus extension between devices with different voltage requirements
  
• TTL logic communication bridging
  
• Prototyping, testing, and educational electronics projects
  
• Sensor and module interfacing across voltage domains