USB to TTL UART Converter Module CH340G 3.3V 5V Switch

USB to TTL UART Converter Module – CH340G Chip, 3.3V/5V Selectable

Take full control of your serial communication projects with this versatile USB to TTL UART Converter Module powered by the reliable CH340G chip. Whether you're flashing firmware, debugging microcontrollers, or communicating with embedded systems, this compact module delivers stable, high-quality serial data transfer with switchable 3.3V and 5V logic levels — making it compatible with a wide range of development boards and devices.

Key Features

• CH340G Chip: Industry-trusted USB-to-serial IC offering wide OS compatibility (Windows, Linux, macOS)
• Dual Voltage Support: Easily switch between 3.3V and 5V logic levels to match your target hardware
• Compact Form Factor: Dimensions of 50mm × 40mm × 24mm — fits neatly into any project enclosure or breadboard setup
• SMD Components: Surface-mount design for improved reliability and a cleaner PCB layout
• 6 Variants Available: Choose from 10PCS, 10PCS Yellow, 5PCS, CH340G Yellow, CH340G, or 5PCS Yellow to suit your quantity and build needs
• Plug-and-Play USB Interface: Standard USB connector for quick, hassle-free connection to any computer
• Wide Application: Perfect for Arduino projects, Raspberry Pi serial communication, ESP8266/ESP32 flashing, and general UART debugging

Specifications

Who Is This For?

This module is ideal for electronics hobbyists, embedded systems engineers, makers, and students who regularly work with microcontrollers, single-board computers, or development kits. The switchable voltage makes it a universal tool across beginner and advanced projects alike.

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Frequently Asked Questions

Q: What does the CH340G USB to TTL UART Converter Module do?

A: The CH340G UART module bridges the communication gap between your computer's USB port and TTL serial devices. It converts USB signals to UART TTL-level signals (and vice versa), allowing you to program microcontrollers, flash firmware to devices like the ESP8266/ESP32, or debug serial communication on development boards — all from a standard USB connection on your PC, Mac, or Linux machine.

Q: What is the difference between the 3.3V and 5V settings on this module?

A: The on-board voltage switch lets you select the logic level output of the TX/RX serial lines. Use 3.3V when connecting to devices that operate at 3.3V logic (e.g., ESP8266, ESP32, many ARM-based boards) to avoid damaging them. Use 5V for classic 5V microcontrollers like standard Arduino boards. Always match the voltage to your target device before connecting.

Q: Is the CH340G driver compatible with my operating system?

A: The CH340G chip is supported on Windows, macOS, and most Linux distributions. On Linux it is often natively supported without any additional driver installation. For Windows and macOS, the CH340 driver is freely available and easy to install, after which the module appears as a standard COM/serial port ready for use with your IDE or terminal software.

Q: What quantity and color variants are available?

A: This listing offers six variants: 10PCS, 10PCS Yellow, 5PCS, CH340G Yellow, CH340G, and 5PCS Yellow. The color variants (yellow PCB) are functionally identical to the standard versions — the difference is purely aesthetic, making it easy to distinguish modules in multi-board setups.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.