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

The 7Semi BSS138 4-Channel Bi-Directional Logic Level Converter Module enables safe communication between electronic devices operating at different logic voltage levels. Based on the proven BSS138 N-Channel MOSFET level-shifting circuit, this module provides automatic bidirectional voltage translation between 1.8V, 2.5V, 3.3V, 5V, and up to 10V logic systems.

It is particularly useful when connecting modern low-voltage microcontrollers such as ESP32, ESP8266, STM32, RP2040, Raspberry Pi, NRF52, and Arduino Due to traditional 5V sensors, modules, displays, or communication interfaces.

The board features four independent bidirectional channels, making it ideal for I²C buses, UART serial communication, 1-Wire devices, GPIO signals, and low-speed SPI interfaces. Each channel includes onboard 10kΩ pull-up resistors and a BSS138 MOSFET, ensuring reliable signal translation without additional external components.

Key Features

• 4 Independent Bidirectional Channels – Supports simultaneous voltage translation for up to four digital signals.
• Automatic Direction Sensing – No direction-control pin or software configuration required.
• Open-Drain Bus Compatible – Works seamlessly with clock stretching and open-drain architectures.
• Ideal for Multiple Interfaces – Suitable for I²C, UART, GPIO, 1-Wire, and low-speed SPI applications.
• Reliable BSS138 MOSFET Architecture – Uses proven BSS138 N-channel MOSFETs for dependable level shifting.
• Integrated Pull-Up Resistors – Includes onboard 10kΩ pull-up resistors on each channel.
• Breadboard-Friendly Layout – Standard pin spacing allows quick prototyping and testing.