CP2104 USB to TTL UART Serial Module & STC Downloader Flashing Cable

The CP2104 USB to TTL Serial Port UART Module is a compact, reliable interface adapter designed for developers, hobbyists, and electronics enthusiasts. Built around Silicon Labs' CP2104 chip, this module delivers stable USB-to-TTL serial communication — perfect for firmware flashing, microcontroller programming, and serial data debugging. Whether you're working with STC microcontrollers, Arduino boards, Raspberry Pi projects, or other embedded systems, this downloader cable gives you a dependable, plug-and-play connection every time.

Key Features

CP2104 Chip: High-performance USB-to-UART bridge IC for fast, stable serial communication
USB to TTL Conversion: Seamlessly converts USB signals to 3.3V/5V TTL logic levels for broad microcontroller compatibility
STC Downloader Support: Ideal for flashing and programming STC series microcontrollers with ease
UART Interface: Standard TX/RX/GND/VCC pinout for universal compatibility with development boards and embedded modules
Compact Module Design: Lightweight and portable — great for bench use or on-the-go development
Driver Support: Compatible with Windows, macOS, and Linux with CP2104 driver installation
LED Indicators: Onboard TX/RX LEDs for quick data transmission status at a glance
Durable Cable: Robust USB cable construction for long-lasting everyday use

What's Included

1 × CP2104 USB to TTL UART Serial Module / STC Downloader Flashing Cable

Ideal For

Firmware flashing and microcontroller programming
STC89, STC15, STC8 series MCU downloads
Arduino, ESP8266, ESP32, and Raspberry Pi serial communication
Embedded systems development and debugging
Serial console access for routers, switches, and single-board computers

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Frequently Asked Questions

Q: What is the CP2104 USB to TTL UART Serial Module used for?

A: The CP2104 USB to TTL UART Serial Module is used to establish a serial communication link between your computer (via USB) and microcontrollers or embedded devices (via TTL logic). It is commonly used for firmware flashing, STC microcontroller programming, debugging serial output, and communicating with development boards like Arduino and ESP32.

Q: Is the CP2104 module compatible with Windows, macOS, and Linux?

A: Yes! The CP2104 chip is widely supported across major operating systems including Windows 7/10/11, macOS, and Linux. You simply need to install the CP2104 USB driver (available from Silicon Labs), after which the module is recognized as a virtual COM port for easy use.

Q: What voltage levels does this CP2104 UART module support?

A: The CP2104 module supports both 3.3V and 5V TTL logic levels, making it broadly compatible with a wide range of microcontrollers and development boards. Always check your target device's voltage requirements before connecting to avoid damage.

Q: Can this module be used to flash STC microcontrollers?

A: Absolutely. This module is purpose-compatible with STC series microcontrollers (including STC89, STC15, and STC8 families) and works seamlessly with STC-ISP software for fast, reliable firmware downloads and flashing.

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.