2-Channel Bi-Directional Logic Level Converter 3.3V to 5V TTL Module

Safely bridge $3.3 ext{V}$ and $5 ext{V}$ microcontroller domains with the 2-Channel Bi-Directional Logic Level Converter Module. Engineered with high-speed N-channel MOSFETs and integrated pull-up resistors, this compact board seamlessly steps down $5 ext{V}$ TTL signals to $3.3 ext{V}$ and steps up $3.3 ext{V}$ to $5 ext{V}$ across two independent channels simultaneously. Designed specifically for bidirectional communication lines like I2C (SDA/SCL) or UART (TX/RX), it prevents over-voltage damage when connecting low-voltage microcontrollers (such as ESP32, Raspberry Pi, or STM32) to $5 ext{V}$ sensors and peripheral modules.

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Tags 2 Channel Logic Level Converter 3.3V to 5V Logic Shifter 2 Channel Bi-Directional Level Translator I2C 2 Channel Level Converter UART Logic Level Converter Raspberry Pi Level Shifter ESP32 TTL Level Shifter

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Product Details :

The 2-Channel Bi-Directional Logic Level Converter Module provides an ultra-compact solution for interfacing mixed-voltage digital circuits. When pairing modern $3.3 ext{V}$ microcontrollers with legacy $5 ext{V}$ sensors or displays, connecting high-voltage output lines directly can cause permanent GPIO pin degradation.

This active level translator utilizes two independent BSS138 N-channel MOSFET circuits equipped with $10 ext{k}Omega$ pull-up resistors on both high and low sides. It automatically shifts voltage levels bi-directionally without requiring external directional control pins. Perfect for two-wire protocols like I2C ( $SDA$ and $SCL$ ) or single serial UART ports ( $TX$ and $RX$ ), this module ensures clean voltage transitions and preserves signal integrity across mixed-power systems.

Key Features and Benefits

2 Independent Channels: Ideal for two-line communications like I2C or single-channel serial (UART) links.
Automatic Bi-Directional Shifting: Seamlessly shifts signals high-to-low and low-to-high in real time.
I2C & UART Bus Compatible: Integrated $10 ext{k}Omega$ pull-up resistors provide fast rise times for open-drain and push-pull digital communication.
Over-Voltage Protection: Prevents $5 ext{V}$ signals from overdriving sensitive $3.3 ext{V}$ GPIO ports on Raspberry Pi, ESP8266, ESP32, and ARM Cortex boards.
Minimal Footprint: Ultra-small design takes up minimal breadboard or custom PCB space.

Technical Specifications

Feature Component	Specification Details
High-Voltage Side ( $HV$ )	$3.3 ext{V DC to } 5.5 ext{V DC}$ (Typically $5 ext{V}$ )
Low-Voltage Side ( $LV$ )	$1.8 ext{V DC to } 3.3 ext{V DC}$ (Typically $3.3 ext{V}$ )
Number of Channels	2 Bi-Directional Channels
Active Transistor Element	BSS138 N-Channel MOSFETs
Onboard Pull-up Resistors	$10 ext{ k}Omega$ on High and Low sides per channel
Supported Interfaces	I2C, UART (Serial TTL), PWM, General Digital I/O
Max Communication Speed	Up to $2 ext{ Mbps}$

Wiring & Pinout Reference

1. Pin Mapping Description:

Pin Label	Side	Connection / Function
HV	High Voltage	Connect to $5 ext{V}$ Power Supply rail
GND	High Voltage	Connect to System Common Ground ( $GND$ )
HV1 - HV2	High Voltage	Digital I/O channels operating at $5 ext{V}$ logic level
LV	Low Voltage	Connect to $3.3 ext{V}$ Power Supply rail
GND	Low Voltage	Connect to System Common Ground ( $GND$ )
LV1 - LV2	Low Voltage	Digital I/O channels operating at $3.3 ext{V}$ logic level

2. Typical UART Serial Connection Example:

     3.3V ESP32 Microcontroller                 Level Converter Module                 5V GPS / Serial Device
  +------------------------------+             +----------------------+             +--------------------------+
  |  3.3V Power                  |------------>| LV                HV |<------------| 5V Power                 |
  |  GND                         |------------>| GND              GND |<------------| GND                      |
  |  TX2 (GPIO 17)               |------------>| LV1              HV1 |------------>| RX                       |
  |  RX2 (GPIO 16)               |<------------| LV2              HV2 |<------------| TX                       |
  +------------------------------+             +----------------------+             +--------------------------+

IMPORTANT WIRING NOTE: $HV$ must always receive a higher voltage than $LV$ . Both $HV$ , $LV$ , and a common $GND$ connection must be established for the MOSFET logic level circuit to operate properly.

Applications

I2C Bus Interfacing: Connecting $3.3 ext{V}$ I2C sensors (such as MPU6050, BMP280, OLEDs) to $5 ext{V}$ Arduino UNO boards.
UART Serial Level Shifting: Bridging $3.3 ext{V}$ Bluetooth modules (HC-05/HC-06) or GPS modules to $5 ext{V}$ microcontrollers.
Raspberry Pi & ESP32 GPIO Protection: Protecting $3.3 ext{V}$ logic boards when reading input triggers from $5 ext{V}$ sensors.
Prototyping & Educational DIY Electronics: General-purpose voltage translation in mixed-voltage projects.