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Which ground for TVS diodes?

Philip Klug
Prodigy 20 points


Should a TVS device like TPD2EUSB30ADRTR be connected to signal ground or earth ground when both are available on a circuit board? It seems logical to direct a high voltage spike to earth ground.  Earth or signal ground?  Why or why not?

  • 0
    TI__Mastermind 18425 points

    Hello Philip,

    You are correct is saying that the High Voltage spike should preferably be directed to earth ground. However, selecting the earth ground also depends on which side of the magnetics the TVS devics is connected to. TVS device manufacturers have recommendations for where the devices should be connected. For e.g. if the TVS devices are placed on the PHY side of magnetics then the selection of ground can change if earth ground is not accessible from that position.

    -Regards,

    Aniruddha

  • 0 in reply to Aniruddha Khadye
    Prodigy 20 points

    The data sheet for this part says it supports USB 3.0 data rates (5Gps).  Can I also use this to protect the high speed differential signals of Giga-bit Ethernet?