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SN65HVD3082E: IC damaged by BUS ESD issue

Gary Zeng
Intellectual 1830 points

Part Number: SN65HVD3082E

Hi team,

My customer is using SN65HVD3082E device in AC drive product and it is damaged by RS485 BUS ESD issue. They plan to add TVS like SM712 whihc is recommended in datasheet.

Q1: Is it SM712 suitable for protect SN65HVD3082E, it is -7V/+12V clamp voltage.

Q2: Do we have 8us/20us withstand voltage data of SN65HVD3082E?

  • 0
    TI__Guru* 79571 points
    Gary Zeng said:
    Q1: Is it SM712 suitable for protect SN65HVD3082E, it is -7V/+12V clamp voltage.

    Yes, from what I can see this looks like it should conduct (Using the Reverse stand off voltage) before the abs max of -9V to 14V based on our device's datasheet but it also depends on the expected peak current. You can see in the SM712 datasheet that the clamp voltage changes depending on which pin is struck and the max current. 

    I can also loop in the protection devices team in TI to see if they may have a TI suggested TVS diode they may want to recommend.

    Gary Zeng said:
    Q2: Do we have 8us/20us withstand voltage data of SN65HVD3082E?

    We have some data for the superset die but I'm not sure if this helps the customer since it's just a pass fail criteria. 

    -Bobby

  • 0 in reply to BOBBY
    TI__Expert 4030 points

    Hi Gary,

    What is your expected operating voltage? Since recommended operating condition is very close to absolute max rating, there are very limited options and the fact that it is not a symmetrical condition makes it even harder. SM712 has high clamping voltage values that could damage the transceiver since it's well above the abs max rating of the transceiver.

    Best,

    Bryan