The CH340G / CH340E USB to TTL Converter Module is a high-quality and stable UART communication solution designed for microcontroller programming, serial debugging, embedded system development, and electronics prototyping. Built with the original CH340G chip officially recommended by STC, this module ensures reliable USB-to-TTL conversion with excellent driver compatibility across multiple Windows operating systems.

Unlike low-quality market alternatives, this module uses premium yellow header pins that provide stronger mechanical durability, better conductivity, and longer service life. Integrated power, TXD, and RXD indicator LEDs allow users to visually monitor power status and serial data transmission in real time without using external testing tools.

The onboard voltage selection jumper allows switching between 3.3V and 5V output, making it compatible with a wide range of development boards including Arduino, ESP8266, ESP32, STM32, STC microcontrollers, Raspberry Pi UART, and other TTL-based devices. Powered directly from USB, it is convenient for portable development, field debugging, and workshop use.

This USB to serial adapter is ideal for students, engineers, repair technicians, and hobbyists who require stable data communication and long-term reliability in their electronics projects.

Features:

• Original CH340G USB to TTL converter chip for stable UART communication

• Fully compatible with STC microcontrollers and mainstream development boards

• High-quality yellow header pins for improved durability and signal reliability

• Onboard LED indicators for Power, TXD, and RXD activity monitoring

• Selectable 3.3V or 5V output using jumper configuration

• USB powered for easy plug-and-play operation

• Strong driver compatibility across multiple Windows versions

• Compact size suitable for breadboards and portable toolkits

• Supports serial communication debugging and firmware flashing

• Ideal replacement for FTDI modules at lower cost

• Reliable performance for long-term development and testing

• Clean PCB layout for stable data transmission

Specifications:

• Chip: Original CH340G USB to TTL converter

• LED Indicators: PWR (Power), TXD (Transmit), RXD (Receive)

• Voltage Output Options: 3.3V and 5V selectable by jumper

• Power Supply: USB powered

• Operating System Support:

  • Windows 98

  • Windows ME

  • Windows 2000

  • Windows XP

  • Windows Server 2003

  • Windows Vista

  • Windows Server 2008

  • Windows 7 (32-bit / 64-bit)

  • Windows 8 (32-bit / 64-bit)

• Pin Type: High-grade yellow header pins

• Interface Type: USB to TTL UART serial

How to Use:

• Connect the module to your computer using a USB cable

• Install CH340 drivers if not automatically detected by the system

• Select output voltage (3.3V or 5V) using the onboard jumper according to your device requirement

• Connect TXD to RX pin of target device

• Connect RXD to TX pin of target device

• Connect GND to GND of target board

• Use Arduino IDE or serial monitor software for communication or firmware upload

• Observe TXD and RXD LEDs to confirm data transfer

• Disconnect safely after completing programming or debugging

Applications:

• Arduino programming and serial monitoring

• ESP8266 and ESP32 flashing and debugging

• STM32 and STC microcontroller communication

• UART serial debugging

• Embedded systems development

• IoT project development

• Robotics controllers

• Electronics training labs

• USB to serial data conversion

• Firmware upload and bootloader programming

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