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DP83867IR: ESD protection of the chip

Sebastian Ciesluk80
Expert 1121 points
Part Number: DP83867IR


The datasheet page 14 states ESD Rating : Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 MDI 8kV  tested per IEC61000-4-2.

Could you please clarify

1) Is the chip protected to IEC61000-4-2 in particular withstanding 8KV at 30A I peak air / contact discharge)?

2) Does internal ESD protection of the chip eliminate the need of using external ESD protection needed for Ethernet port assuming 8kV as maximum voltage spikes expected?

Thanks

Sebastian

  • 0
    TI__Expert 8721 points

    Hi Sebastian,

    Sebastian Ciesluk80 said:
    1) Is the chip protected to IEC61000-4-2 in particular withstanding 8KV at 30A I peak air / contact discharge)?

    It is MDI pins Contact discharge upto 8kV.

    Sebastian Ciesluk80 said:
    2) Does internal ESD protection of the chip eliminate the need of using external ESD protection needed for Ethernet port assuming 8kV as maximum voltage spikes expected?

    What is the requirement for your end application ? Are there any EMI requirements or IEC standards you want to pass on your tests ?
    It is recommended to have ESD protection diodes in applications being tested for ESD tests.

    Regards,
    Rahul

  • 0 in reply to Rahul
    Expert 1121 points

    Thanks Rahul,

    1) thanks yes MDI is what I am interested , wonder if they are IEC61000-4-2 compatible i.e. tested with 8KV 30A pulse. This 30A seems like a crucial value to asses quality of protection.

    2) My application is an industrial device but I do not have to comply to any standards. I would like though to design a device lasting long in such environment, though do not want to throw money where it is not needed if the internal protection of DP83867IR already does it for me. Looking at two typical standards Eth port needs to comply with IEC 61000-4-2 and IEC61000-4-5 it looks like voltage wise DP83867IR is already questionable ( 15kV air),  it might be also the ratio / duration of pulses which stipulates the need for external TVS ( in IEC 61000-4-5). What do you think?

  • 0 in reply to Sebastian Ciesluk80
    TI__Expert 8721 points

    Hi Sebastian,

    The values given in the datasheet are tested directly on the pins and not on the Ethernet PORT.

    I am not sure if the pins are tested with a duration of strikes if that is what you are referring to ?

    IEC 61000-4-5 is the Surge you are referring to and these tests we haven't performed on the pin level.

    I would recommend to have a place holder for TVS diodes/ ESD diodes. If your application do not need them, the MDI pins can body upto the value shared in the datasheet.

    Regards,
    Rahul

  • +1 in reply to Rahul
    Expert 1121 points

    Thanks Rahul, I will go for external TVS diodes.