USB-TTL 3.3V5V UART Debug Cable

This USB-TTL UART debug cable is a practical tool for embedded engineers, hobbyists and production technicians who need to add a TTL serial port to modern computers or debug microcontroller-based devices. It is widely used for Arduino programming, ESP32/ESP8266 firmware flashing, STM32 serial debugging, Raspberry Pi Pico testing, sensor data reading, industrial module configuration and prototype verification.

The module supports both 3.3V and 5V TTL logic levels, making it compatible with most low-voltage microcontrollers, wireless modules, sensors and legacy 5V serial peripherals. The onboard voltage switch or jumper selection allows users to quickly match the target device logic voltage, helping to avoid voltage mismatch risks during debugging.

Equipped with CP2102 or CH340 serial bridge chip, the cable supports standard baud rates from 300bps to 1.5Mbps, covering most common UART debugging scenarios. The output pins include TX, RX, GND and VCC, providing a clear and convenient connection for breadboards, development boards and custom circuits. It supports automatic flow control in most development environments and works seamlessly with serial terminal software, firmware upload tools and AT command testing utilities.

The USB-TTL debug cable is plug-and-play on most operating systems, including Windows 7/8/10/11, Windows Server, macOS, Linux and Android. For embedded developers, it offers a low-cost but reliable way to view debug logs, send AT commands, upgrade firmware and validate UART communication without additional serial expansion cards.

Standard cable lengths of 1m, 1.5m and 3m are available. We also support custom cable length, pin definition, housing color, logo printing and private-label packaging for bulk orders.

• Switchable 3.3V / 5V TTL logic level for wide device compatibility
• CP2102 or CH340 chipset, stable UART serial communication
• Supports 300bps to 1.5Mbps baud rate for most debug scenarios
• TX / RX / GND / VCC output pins, easy for prototyping and flashing
• Plug-and-play on Windows, macOS, Linux and Android
• Ideal for Arduino, ESP32, ESP8266, STM32, Raspberry Pi Pico and sensors
• Custom length, pin layout, logo and packaging supported for bulk orders