CH340C – SMD USB to Serial (UART) Converter IC

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(USB 2.0 Full-Speed to TTL UART Bridge in SOP-16 SMD Package)

The CH340C is a compact surface-mount USB-to-serial interface chip that converts USB data signals to standard TTL UART levels compatible with microcontrollers, embedded systems, and communication devices. It supports full-speed USB 2.0 communication and a wide range of baud rates up to 2 Mbps, making it ideal for USB connectivity, device programming, serial debugging, and custom interface designs.

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Key Features

Converts USB 2.0 full-speed signals to UART TTL levels
Baud rate range up to 2 Mbps for high-speed serial data transfer
Crystal-less design with internal oscillator (no external crystal required)
Supports common control signals (RTS, CTS, DTR, DSR) for hardware flow control
Operates with 3.3 V and 5 V logic levels
Small, compact SOP-16 SMD package for space-efficient PCB layouts
RoHS compliant and suitable for modern embedded designs
Compatible with standard USB drivers (CH341 family drivers on Windows, Linux, macOS)

Technical Specifications

Type: USB-to-UART Serial Converter IC
USB Standard: USB 2.0 Full-Speed (12 Mbps)
Baud Rate: Up to 2 Mbps
Supply Voltage: 3.3 V / 5 V (logic compatible)
Package: SOP-16 Surface Mount (SMD)
Logic Levels: TTL compatible
Operating Temperature: -40 °C to +85 °C (typical)
No External Crystal Required: Built-in oscillator simplifies design and reduces components