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Original question:

TPD6E05U06: How to connect the GND pins?

TPD6E05U06: use ESD diodes on Internal connectors

BX27
Genius 3870 points
Part Number: TPD6E05U06
Other Parts Discussed in Thread: STRIKE

Hi there, 

We have used TPD6E05U06RVZR on user USB 3.0 and user HDMI interfaces. These conn could be touched by user and will bear IEC standard EMC test during verification process, so they need ESD diode.

Now we have a lot of internal interfaces inside our machine.  Such as board-to-board PCIE connectors, internal HDMI / SATA board-to-wire connectors, and so on. These connceterIs are only touched when assembling. 

Is it necessary to use a ESD diodes like TPD6E05U06RVZR ? and why?

Thanks!

  • +1
    TI__Expert 4910 points

    Hi, 

    If the system has any chance of being exposed to an ESD strike that is greater than the Human Body Model rating then an ESD diode is necessary for the user (external) interfaces. If there is no protection on these user interfaces then there is a chance the downstream circuitry will be damaged from an ESD strike. 

    For the internal interfaces, it is dependent. Since these connectors are only touched during assembly then they would need to be bale to survive Human Body Model and Charged-device model. You can always implement ESD protection internally but that does mean an additional cost and space on the board. 

    Please let me know if you have any additional questions. 

    Best Regards, 

    McKenzie Eaker

  • +1 in reply to McKenzie Eaker
    Genius 3870 points

    Hi, McKenzie ,  thanks for answer.

    I  check some IC datasheet, indeed they provide HBM and CDM data, which are usually aroung +/-1000V and 300V.

    May I ask how could I determine whether the ESD rating in datasheet is enough for my application?

    We do hope to save cost and board space for internal interfaces if possible. Thanks!

  • +1 in reply to BX27
    TI__Expert 4910 points

    Hi, 

    From my understanding, the HBM and CDM ratings will suffice for internal interface components. The HBM and CDM are meant for the device to survive manufacturing, assembly, and shipping. Once these internal interface components are inside the system and there is no possibility of human interference then internal ESD protection is not necessary. 

    Let me know if that helps or need more clarification! 

    Best Regards, 

    McKenzie