$17^.78

Free 30-day Returns

Limit 99999 per customer.

Ships from China.

Sold by ThermalNest

Shipped by ThermalNest

Price alert

Add to Wish List

Meet Your Seller

ThermalNest

See Seller Store

Main image of AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 2 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 3 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 4 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 5 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 6 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Alt view image 7 of 7 - AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Shop All AJMRTC Products | Visit ThermalNest Store

AJMRTC CH340G USB2.0 TypeA to TTL UART Serial Converter Module,3.3V 5V Dual Voltage Serial Programmer Adapter for STC MCU,Replace PL2303 for DIY Electronic Debugging

Be the first to review this product...

- CH340G chip solution converts USB2.0 TypeA interface to TTL UART serial signal for MCU programming and debugging
- Supports dual 3.3V and 5V output voltage, compatible with widerange STC and other common microcontroller units
- Works as practical replacement for PL2303 serial adapter, widely used for firmware download and hardware test
- Compact module design with stable signal transmission, easy wiring for electronic experiment and project development
- Driversupported for mainstream operating systems, ideal for Arduinorelated projects, MCU burnin and repair work

Overview

Specs

Reviews

Any questions? Our AI mode will help you find out quickly.

Try me now

AJMRTC CH340G USB to TTL serial converter module is a costeffective serial programmer for electronic hobbyists and technicians. It converts standard USB2.0 TypeA signal into TTL UART serial level, supporting STC MCU chip programming, firmware downloading and serialport debugging. Both 3.3V and 5V voltage levels are selectable to match different microcontroller hardware requirements. This module serves as a reliable substitute for PL2303 serial adapters. Compact layout simplifies wiring for experimental circuits, DIY projects and equipment maintenance. Please install corresponding CH340 driver software before use on your computer.

Specifications

Brand: AJMRTC Chipset: CH340G Input Interface: USB2.0 TypeA Output Interface: TTL UART Serial Voltage Option: 3.3V / 5V Function: Serial Programmer, MCU Debugging, Firmware Download Compatible MCU: STC series and other TTLsupported microcontrollers Alternative To: PL2303 serial adapter Note: CH340 driver installation required for full functionality

Additional Information
First Listed on Newegg	August 28, 2026

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
CONTACT

Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by ThermalNest Return Policy

Manufacturer Contact Info

For a directory of all our manufacturers, please click below.
Manufacturers Directory

Item#: 9SIC8JMM583738