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TPD4E1U06 - ESD Protection for Ethernet + RJ45 with Integrated Magnetics

Benjamin Moore
Mastermind 29695 points
Other Parts Discussed in Thread: TLK105L, TPD4E1U06

Hello Team,

I'm working on a design where one of our Ethernet PHYs (TLK105L) is being used with an RJ45 connector with integrated magnetics. I'm trying to determine if it makes sense to add ESD protection between the RJ45 and the PHY. The device I'm looking at for this is the TPD4E1U06.

I took a look at this related thread and it has led me to believe that I may not get the protection I'm hoping for due to the integration of the magnetics iwith the RJ45: http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/314433

Any thoughts? I appreciate the help!

Best Regards,

Ben

  • 0
    TI__Genius 12190 points

    Hi Ben,

    In your case, the TVS goes between the magnetics and PHY, which is where we recommend TPD4E1U06 be placed in this application. The thread you pointed out has the magnetics built-in to the PHY so that the TVS could not be placed there. The reason we need to be between the magnetics and the PHY is that because between the connector and magnetics there can be high surge currents from attaching long cables, higher than what we are rated for. Your choice of connector will work well with TPD4E1U06 placed near the connector as is recommended in our ESD Protection Layout Guide. All of the information in that guide is relevant, by the way.

    Regards,

  • 0 in reply to Guy Yater
    TI__Mastermind 29695 points
    Guy,

    Thank you for the clarification! I appreciate the help.

    Best,
    Ben
  • 0 in reply to Benjamin Moore
    TI__Genius 12190 points
    Glad I can help. One more reason not to put our TVS between connector and magnetics would be if there is POE, the Vbias would likely violate the Vbr of our TVS and cause a breakdown.