PL2303 USB to TTL Serial Converter Module

PL2303 USB to TTL Serial Converter Module

The PL2303 USB to TTL Serial Converter Module creates a serial connection between a computer and UART-enabled electronic devices. It converts USB data into TTL-level TX and RX signals for microcontrollers, development boards, routers, and embedded systems.

The computer recognizes the converter as a serial COM port after installing the correct driver. Therefore, you can use terminal programs, programming tools, or development software to exchange serial data.

In addition, the module may provide 3.3V and 5V power outputs. This feature helps power compatible low-current circuits during testing and configuration.

Key Features

• PL2303 USB-to-UART converter chipset
• Converts USB to TTL serial communication
• TX and RX data connections
• Supports full-duplex UART communication
• 3.3V and 5V power outputs
• Creates a virtual serial COM port
• Compact and easy-to-use module
• Suitable for serial monitoring and debugging
• Works with common terminal applications
• Compatible with many microcontroller platforms
• No external serial power supply required for basic operation

Technical Specifications

• Converter Type: USB to TTL UART
• Controller: PL2303 series
• Computer Interface: USB
• Device Interface: TTL UART
• Data Pins: TXD and RXD
• Power Outputs: 3.3V and 5V
• Communication: Asynchronous serial
• Operation: Full duplex
• Driver: May require a compatible PL2303 driver
• Supported Systems: Windows, Linux, and macOS with a suitable driver

Module Pinout

Pin labels may vary between production versions. However, most modules provide the following connections:

• 5V: USB 5V power output
• 3.3V: Regulated 3.3V power output
• GND: Common ground connection
• TXD: Serial data transmitted from the converter
• RXD: Serial data received by the converter

Connect the converter’s TXD pin to the target device’s RX pin. Likewise, connect the converter’s RXD pin to the target device’s TX pin. Both devices must also share a common ground.

Applications

The converter provides a convenient serial connection for:

• Arduino serial communication
• ESP8266 and ESP32 debugging
• STM32 configuration and programming
• Microcontroller firmware uploading
• GPS and GSM module testing
• Router serial-console access
• Sensor and module configuration
• Bootloader communication
• Embedded-system diagnostics
• AT-command testing

Important Connection Notes

Check the required logic voltage before connecting the module. The 3.3V and 5V pins may indicate power outputs rather than selectable TX and RX logic levels.

Also, do not connect the module’s power output if the target board already uses another power supply. Instead, connect only GND, TXD, and RXD when appropriate.

This converter can upload firmware only when the target controller supports UART programming. Some boards also require manual BOOT or RESET control.

Finally, verify the exact PL2303 chip version before downloading a driver. Older or non-genuine versions may not work with the newest operating-system drivers.

Package Includes

• 1 × PL2303 USB to TTL Converter Module