CH340K USB to TTL Serial Converter Chip ESSOP10
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Prices updated: 13 Oct 2026
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About this product
CH340K is a USB-to-serial (UART) converter IC from WCH, used to add a USB serial port to custom boards and to exchange data between a computer and microcontrollers. It comes in an ESSOP10 package and is intended for designers building their own USB-to-TTL interface.
Specifications
- Function
- USB to UART / TTL serial
- Package
- ESSOP10
- Manufacturer
- WCH
Frequently asked questions
Do I need a driver on Windows?
Windows often needs the WCH CH340 driver before the COM port appears. If the device does not show up in Device Manager, install the driver from WCH.
How do I wire it to a microcontroller?
Connect the chip's TXD pin to the microcontroller RX pin, its RXD pin to the microcontroller TX pin, and share a common ground. Match the logic level to your microcontroller and confirm pin details in the CH340K datasheet.
