USB – UART Communication and Programming Adapter CH340 3.3V / 5V


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Availability: In stock SKU: 26038
Quantity 3 - 9 C$3.38
Quantity 10 - 24 C$3.19
Quantity 25 + C$3.10
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The CH340 USB-UART adapter is the most commonly used USB interface for microcontroller applications worldwide.

CANADUINO® CH340 USB-UART interface operates with 3.3V and 5V TTL levels and provides the connection between the RX and TX pins you can find on many electronic modules and microcontroller development modules, and the USB port of a host computer for programming or monitoring.

This adapter can be used as a USB to RS323 adapter as long the connected device accepts the lower TTL logic level. If the TTL level is insufficient, an RS232 to TTL adapter is a cheap and reliable solution to turn the CH340 into a real RS232 device.

We recommend downloading the required USB driver for the CH340 chip from the manufacturer’s official website.

If you prefer a cable instead of the dongle-style, see our PL2303TA USB-TTL UART interface cable.

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1 review for USB – UART Communication and Programming Adapter CH340 3.3V / 5V

  1. 4 out of 5

    nalinux (verified owner)

    There’s no DTR line.
    So, when uploading for example to an Arduino Pro Mini, you have to push and release the Reset button on the Arduino to get the communication.
    Several trys may be necessary.


    The missing DTR line is right, as to see in the pictures. These very basic adapters only populate the most common signals. If you need different signals, just take a different adapter. We carry FT232, for example.

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