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Cable Side Ethernet ESD Protection

Dominick Squillace
Prodigy 20 points
Other Parts Discussed in Thread: ESD204

Hello,

Does TI have recommendations for products to protect Ethernet lines from ESD transients on the cable side of the magnetics transformers? (pre-magnetics)

Thanks,

Dom

  • 0
    TI__Genius 17960 points

    Hi Domnick,

    We typically recommend to place ESD protection after the magnetics, there can be very high surges on the connector side due to long cabling as well as significant ground shifts. By placing the diode between the PHY and the magnetics you also get the added protection of the transformer. Is there a reason the customer wants to use ESD protection before the magnetics? 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 20 points

    Hi Sebastian,

    In this scenario there are a few connections made between a couple of boards before the magnetics are introduced and the intent is to help limit any issues on those assemblies. There is basically not enough room next to the connector for the magnetics but there may be for ESD protection.

    Thanks,

    Dom

  • 0 in reply to Dominick Squillace
    TI__Genius 17960 points

    Hi Dominick,

    Could you please provide a schematic so I can give a better recommendation? For primary side ethernet protection we would recommend connecting the diodes as shown below for line to line protection:

     

    A device like ESD204 could be used here. 

    Regards,

    Sebastian