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TPD4E001: Issue with Ethernet

Keith Keller
Expert 7320 points
Part Number: TPD4E001


Hello, 

We're using the TPD4E001 in a new design and are getting marginal failures: 2 out of 15 boards is failing. 

We're only operating at 100Mbps.  Is this a capacitance issue?  Should we use a different device?

Here is the schematic snippet:

Here are the o-scope shots (working 1st and not working 2nd):

Thanks so much for your help.  Keith

  • 0
    TI__Genius 10536 points

    Hi Keith,

    TPD4E001 has a line capacitance of 1.5 pF which more than enough to maintain a 100 Mbps signal. The -3 dB insertion loss should be around 2 GHz for this device. 

    From an ESD schematic standpoint, everything looks good. There might be a layout issue that's causing some sort of board parasitic capacitance. 

    Regards,

    Matt Smith 

  • +1 in reply to Matt Smith
    TI__Expert 7320 points

    Hello,

    We found that we were having soldering issues with the device.

    Everything is working fine on all boards after replacing.

    Thanks very much for your help, Keith