This is my quad serial breakout board.
Due to a lifted pad, component U3 is not fitted. This is the ESD protection IC for the USB bus.
The board is still working perfectly, all UARTs available and TX/RX LEDs. It just doesn't have any ESD protection for the USB D+/D- signals. If this is something you can live without, grab yourself a bargain!
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I'm an electronic engineer/embedded software developer/maker of things from Nottingham, UK.