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The I2C 4-Channel Bi-Directional Logic Level Converter solves one of the most common challenges in mixed-voltage embedded systems: connecting low-voltage $3.3\text{V}$ logic microcontrollers directly to $5\text{V}$ sensors and peripherals without causing electrical damage or missing signal pulses.

Unlike simple resistor divider networks that only step down voltage in one direction and slow down signal transitions, this active module uses high-speed BSS138 N-channel MOSFETs backed by $10\text{k}\Omega$ pull-up resistors on every line. When a signal transitions on either the high-voltage or low-voltage side, the MOSFET automatically switches state, pulling the opposite side high or low in real time. This bidirectional design makes it ideal for open-drain communications like I2C (Serial Data and Serial Clock lines) as well as general-purpose UART, SPI, and digital GPIO signals.

Key Features and Benefits

• 4 Independent Channels: Level-shifts up to four separate digital signal lines simultaneously.

• True Bi-Directional Translation: Automatically shifts signals high-to-low and low-to-high without requiring a direction-control pin.

• Optimized for I2C Bus Compatibility: Onboard $10\text{k}\Omega$ pull-up resistors ensure reliable clock ($SCL$) and data ($SDA$) signal edges.

• Multi-Voltage System Protection: Protects sensitive $3.3\text{V}$ or $1.8\text{V}$ GPIO inputs on Raspberry Pi, ESP32, and STM32 from $5\text{V}$ over-voltage degradation.

• Ultra-Compact Footprint: Easily fits on breadboards, prototyping shields, or inside custom enclosures.

Technical Specifications

Wiring & Pinout Reference

1. Pin Mapping Description:

2. Typical I2C Wiring Example (ESP32 to 5V I2C Sensor):

     3.3V ESP32 Microcontroller                 Level Converter Module                 5V I2C Sensor / Display
  +------------------------------+             +----------------------+             +--------------------------+
  |  3.3V Power                  |------------>| LV                HV |<------------| 5V Power                 |
  |  GND                         |------------>| GND              GND |<------------| GND                      |
  |  GPIO 21 (SDA)               |------------>| LV1              HV1 |------------>| SDA                      |
  |  GPIO 22 (SCL)               |------------>| LV2              HV2 |------------>| SCL                      |
  +------------------------------+             +----------------------+             +--------------------------+

IMPORTANT WIRING NOTE: Both power inputs ($HV$ and $LV$) and at least one Ground connection ($GND$) MUST be connected for the level shifting circuit to operate. $HV$ must always be higher than $LV$.

Applications

• Interfacing ESP32 / Raspberry Pi with 5V Modules: Interfacing $3.3\text{V}$ development boards with $5\text{V}$ I2C LCD displays, 5V ultrasonic sensors (HC-SR04), and 5V relays.

• Arduino mixed-voltage systems: Connecting $3.3\text{V}$ I2C sensors (such as BME280, MPU6050, or OLED screens) to $5\text{V}$ Arduino UNO / Mega boards.

• UART Serial Level Shifting: Translating $3.3\text{V}$ GPS modules to $5\text{V}$ microcontroller serial ports.

• Bi-directional Bus Communication: Protecting open-drain data buses in custom automation systems.

Package Includes

• 1 x I2C 4-Channel 3.3V to 5V Bi-Directional Logic Level Converter Module

• 2 x 6-Pin Straight Male Header Strips (Unsoldered)

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Anti-static ESD protective packaging for safe transit