CH340G USB to UART Interface IC 2Mbps SOP-16 for Arduino and ESP32

Specifications:

• Operating Voltage: 5.0 V DC or 3.3 V DC (selectable)
• Operating Current: 4 mA to 7 mA (typical operational draw)
• USB Version Support: USB V2.0 Full-Speed device interface
• Baud Rate Range: 50 bps to 2 Mbps
• Baud Rate Error: Less than 0.3% (transmit signal deviation)
• Clock Requirement: External 12 MHz crystal required (XI/XO pins)
• Modem Control Signals: RTS, DTR, DCD, RI, DSR, CTS
• Hardware Buffer: Built-in independent transmit and receive buffers
• Package Type: SOP-16 (Standard 16-pin surface mount)
• Body Width: 150 mil (3.9 mm)
• Pin Pitch: 1.27 mm (50 mil)
• Operating Temperature Range: -40°C to +85°C
• Driver Compatibility: Fully compatible with standard CH341 VCP drivers

Features

• Full-speed USB device interface, compatible with USB V2.0
• Emulates standard serial port for upgrading legacy serial peripherals or adding extra serial ports via USB
• Hardware full-duplex serial port with built-in transceiver buffer, supporting baud rates from 50bps to 2Mbps
• Supports commonly used MODEM control signals: RTS, DTR, DCD, RI, DSR, CTS
• RS232, RS485, RS422 interfaces available via external level-shifting devices
• CH340R supports IrDA SIR infrared communication, baud rates from 2400bps to 115200bps
• Built-in firmware, software-compatible with CH341; CH341 VCP driver directly applicable
• Supports 5V and 3.3V supply voltage
• CH340C/N/K/E/X/B with integrated clock, no external crystal required; CH340B also integrates EEPROM for serial number configuration
• Available in SOP-16, SOP-8, SSOP-20, ESSOP-10, MSOP-10 lead-free packages, RoHS compliant

Package Includes:

• 1 X CH340G USB to UART Interface IC 2Mbps SOP-16 for Arduino and ESP32  

Frequently Asked Questions

• What is the CH340G IC used for?
  It is a USB to UART bridge controller used to add standard serial communication capabilities to microcontrollers or to upgrade legacy RS232 devices to a USB interface.
• What is the difference between the CH340G and CH340C?
  The CH340G requires an external 12MHz crystal oscillator to function, whereas the CH340C has a built-in internal clock and requires no external crystal.
• What package type is this chip?
  It comes in a standard SOP-16 (Surface Mount) package with a 1.27mm pin pitch.
• Is it compatible with standard Arduino IDE and standard dev boards?
  Yes, the CH340G is the standard serial bridge used on millions of compatible Arduino Uno, Nano, and ESP32 development boards worldwide.
•  What is the maximum supported baud rate?
  The CH340G supports baud rates from 50 bps up to 2 Mbps.
• What operating voltages does the CH340G support?
  It supports both 5V DC and 3.3V DC operation.
• How do I configure the V3 pin for 5V operation?
  When running the IC at 5V, you must connect a 0.1µF decoupling capacitor between the V3 pin and ground.
• How do I configure the V3 pin for 3.3V operation?
  When running the IC at 3.3V, tie the V3 pin directly to the 3.3V VCC supply.
• Does this IC have internal USB pull-up resistors?
  Yes, it features built-in USB pull-up resistors, so the UD+ and UD- pins should be routed directly to the USB connector without external resistors.
• What is the operating temperature range?
  It operates safely between -40°C and +85°C, making it suitable for industrial environments.
• Do I need to install drivers for this IC?
  While Windows 10 and 11 often auto-install the drivers, you may need to manually download the CH341SER VCP driver from WCH's website for older operating systems or macOS.
• Does the CH340G support macOS and Linux?
  Yes, WCH provides dedicated VCP (Virtual COM Port) drivers for both macOS and Linux.