CH340X USB to Serial Chip MSOP10

Description

CH340X USB to Serial Chip MSOP10

The CH340X is a USB-to-serial converter IC from WCH (Jiangsu QinHeng Ltd.), commonly used for adding UART (TTL serial) communication via USB in devices like Arduino clones, DIY electronics, and embedded systems.

Key Specifications of CH340X

General Information

• Manufacturer: WCH (WCH.CN)

• Package: MSOP-10 (CH340X)

• Interface: USB 2.0 Full-Speed (12 Mbps)

• Operating Voltage: 3.3V or 5V (depends on variant)

• Baud Rate: 50 bps to 2 Mbps (software adjustable)

USB & Communication Features

• USB Compliance: USB 2.0 (Full-Speed, 12 Mbps)

• Supported Protocols:

  • UART (TTL serial)

  • Supports 5V or 3.3V logic (depends on variant)

• Built-in USB Termination Resistors (no external resistors needed)

• Supports USB suspend/resume (low power mode)

UART Interface

• Signals: TXD, RXD, RTS#, CTS#, DTR#, DSR#, DCD#, RI# (full modem control signals)

• Baud Rate Accuracy: ±0.3% (with built-in clock, no crystal needed)

• FIFO Buffers: 32-byte TX & RX buffers

Power & Power-Saving

• Operating Voltage:

  • CH340C/CH340E (3.3V logic) – Built-in 3.3V regulator

• Low Power Consumption: ~10mA (active), ~1mA (suspend).

Typical Applications

• USB-to-TTL Serial Adapters (Arduino, ESP8266, ESP32)

• MCU Programming Interfaces (STM32, AVR, etc.)

• Industrial Control & Debugging

• DIY Electronics Projects

Driver Support

• Windows (XP/7/8/10/11) – Automatic driver install (often recognized as “USB-SERIAL CH340”)

• Linux (built-in since kernel 3.x)

• macOS (needs manual driver for some versions)

Datasheet & Reference

For full details, check the WCH CH340 Datasheet.