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Original question:

TPD4S009: is the ESD protection IC looks like its on the wrong side of the power input choke from the PC USB side?

TPD4S009: TPD4S009

Minqi Zhao
Intellectual 1660 points
Part Number: TPD4S009

Dear expert,

My customer is using TPD4S009 to protect gigabit phy, the device is connected between the transformer and the phy chip.

Now it is used between RJ45 and the transformer, they'd like to know can GND and VCC be all floating? What's the impact? Thanks.

  • 0
    TI__Genius 13760 points

    Hi Minqi,

    Welcome to E2E!

    I am unsure which schematic or layout you are referring to. If RJ45 is a connector, we do not recommend placing our devices between the connector and transformer as the common mode voltage can be really high in this section. Our devices should remain connected between the transformer and the PHY chip Refer to section "2.1 Physical Layer" of this application note for more details: "Protecting Ethernet ports from surge events"

    For the TPD4S009, the VCC pin can be left floating, but GND should be connected to ground as this is where the transients will be dissipated through.

    Best regards,

    Andy Robles