CH340N USB to Serial Bridge IC | SOP-8 USB–UART Converter with 12MHz Crystal

The CH340N from WinChipHead (WCH) is a compact, full-speed USB to Serial (USB–UART) bridge IC designed for modern embedded systems, portable electronics, and USB communication interfaces. With a built-in 12 MHz crystal oscillator, this SOP-8 device requires no external crystal, drastically reducing BOM cost and PCB space.

The CH340N supports baud rates from 50 bps to 2 Mbps, integrates full-duplex UART communication buffers, and provides modem control signals such as RTS, CTS, DTR, DSR, DCD, RI, making it compatible with a wide range of MCU and serial peripheral interfaces. Fully compliant with USB 2.0, it is ideal for upgrading traditional UART-based devices to USB connectivity.

Chip Capabilities

• USB to UART conversion

• USB to RS232/RS485/RS422 (with external level shifters)

• USB to IrDA SIR communication (CH340R compatible features)

• USB printer interface (via CH340DS2 specification)

Features / Specifications

• Manufacturer: WinChipHead (WCH) – Nanjing Qinheng Microelectronics

• Part Number: CH340N

• Product Type: USB Interface IC

• Supply Voltage: 3.3V–3.6V

• Baud Rate: 50 bps to 2 Mbps

• USB Compatibility: USB 2.0 Full-Speed

• Clock Frequency: 12 MHz (integrated crystal)

• Type: USB–UART Converter

• Operating Temperature: –40°C to +70°C

• Package: SOP-8 (RoHS compliant)

• Mounting: SMD/SMT

• Driver Compatibility: Uses CH341 VCP drivers

• Interface Signals Supported: RTS, CTS, DTR, DSR, DCD, RI

• Low-power operation and small footprint

Applications

• USB-UART communication in embedded systems

• Desktop/motherboard USB interfaces

• Multi-function printers & POS terminals

• Power supply & UPS management

• Motor control systems

• Consumer appliances (AC units, refrigerators, dryers)

• Solar inverters, VFDs & battery chargers

• Server & network management modules

Package Includes:
1 × CH340N – USB to Serial Bridge IC (SOP-8, Inbuilt 12 MHz Crystal)

Note: Product images are for representation purposes only.