CH9102 USB to TTL (UART) Serial Converter Module 3.3V/5V
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Prices updated: 13 Oct 2026
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About this product
A USB to TTL serial converter module built around the CH9102 chip, which converts a USB port into a UART serial interface. It provides TXD, RXD, GND, 3.3V and 5V pins and supports baud rates from 50 bps to 4 Mbps, making it useful for programming microcontrollers and monitoring serial communication.
Specifications
- Chip
- CH9102
- Interface
- USB Type-A to UART (TTL)
- Baud rate
- 50 bps – 4 Mbps
- Input voltage
- 3.3V – 5V
- Operating temperature
- -40°C to +85°C
- Board size
- 41 x 15 mm
- Supported systems
- Windows, macOS, Linux
Frequently asked questions
Which voltage pin should I use?
Choose the 3.3V or 5V pin to match the logic level of the target board, so the signal levels are compatible.
How do I wire it to a microcontroller?
Connect TXD to the target's RX pin, RXD to the target's TX pin, and GND to GND. The TX and RX lines are crossed.
