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TPD4E05U06: Is TPD4E05U06 possible to use for Ethernet Phy

Shinichi Inoue
Guru 20021 points
Part Number: TPD4E05U06
Other Parts Discussed in Thread: DP83822I, STRIKE, , ESD204

Dear Specialists,

My customer is considering  TPD4E05U06DQA and has a question.

I would be grateful if you could advise.

---

The breakdown voltage of TPD4E05U06DQA is 6.5V to 8.5V.

On the other hand, the absolute maximum rating of the TX± and RX± terminals of “DP83822I” is 6V.

When overvoltage is input, a voltage exceeding the absolute maximum rating (6V) is applied to the TX± and RX± terminals of the DP83822.

That won't be a problem will it?

ｰｰｰ

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Genius 14240 points

    Hi Shinichi,

    Clamping voltage is the spec you would want to look at here, this will be the voltage drop the ethernet PHY will see during an overvoltage event such as an ESD strike.

    It's important to note that clamping is a transient specification while the abs max rating of the TX/RX pins is likely a DC rating. Ideally the clamping voltage is below the abs max rating of the Tx/Rx pins however the transient failure voltage of the ethernet PHY could be above 6 V.

    Clamping voltage is dependent on the test conditions, for example TLP currents which correlate with IEC ESD voltages. 1 A TLP = 0.5kV IEC ESD.

    This device will clamp at minimum of 10 V for a 1A TLP positive ESD strike. This might be too high, the best way to confirm would be to test it on the bench.

    Otherwise you'll need a device with a lower working/clamping voltage, perhaps ESD204DQAR. It has a 3.6 V Vrwm which should support the typical ethernet voltage swing of 2.5V and will have a much lower clamping voltage.

    For further details on our data sheets please see Reading and Understanding an ESD protection datasheet. 

    Regards,

    Sebastian

  • 0 in reply to Sebastian Muriel
    Guru 20021 points

    Hi Sebastian,

    Thank you for your reply.

    TPD4E05U06 has a possibility of exceeding the absolute maximum rating of DP83822I.

    I ask the customer to check the actual circuit.

    Also I'll introduce ESD204.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Genius 14240 points

    Hi Shinichi,

    Happy to help, hopefully ESD204 can meet their clamping requirements. Let me know if you have anymore questions.

    Regards,

    Sebastian