4 ports Isolated USB – UART Converter

What is it?

  • This is a 4 independant ports of USB to UART converter with a digital isolator on the RS232 side


Why did you make it?

It often happens that i have to use multiple UART ports with multiple USB – UART converters with a result of a mess of cables and using all the USB ports of my PC.

For this reason, we have merged 4 of our single port version of USB – UART converters in only one board.

What makes it special?

Each port has the digital isolator MAX12931BASA+. The computer and your target board are electrically isolated.

  • The 4 ports can work at different voltages and the ground is not in common.
  • The noise coming from your computer doesn’t enter in your target board, this can be useful when you are working with sensible analog circuit.
  • The voltage levels of TX and RX are the same of your target board. This means that it doesn’t matter if your board is working at 5V or 3.3V or 1.8V, the logic levels are always correct!

Technical data

  • Original Silicon Labs CP2108: Compatible with almost all the operating systems and capable of variety baud rates of 300 baud to 2 Mbaud
  • Size of 55 x 50mm.
  • The PC will see 4 different COM ports.
  • 4mm isolation between the two sides guarantee an electrical isolation up to 1kV
  • Each ports can work independently at 1.8V up to 5V.
  • Tested in a climatic chamber from -20°C up to 80°C
  • TX and RX LEDs indicators.
  • Micro USB connector.
  • Standard 2.54mm 4 pins female header.
  • Protected by a transparent heat shrink sleeve.


NameDescriptionDirectionVoltage level
+Positive power supplyInput1.8V – 5V
RXUART RXinputsame of +
TXUART TXoutputsame of +

Also the single port version is available in our Tindie store

You can purchase this item in our Tindie and eBay stores: