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ESD761-Q1: VBR thermal coefficient

Andy Snawerdt
Intellectual 1780 points
Part Number: ESD761-Q1

Hi Team,

My customer is requesting information on the thermal coefficient of the breakdown voltage of this device and wasn't able to find it in the datasheet. Is this something we could provide?

Thanks!

- Andy

  • 0
    TI__Genius 14240 points

    Hi Andy,

    This is not something we typically provide, what is driving the need for this and/or what is the application? If they want to see the breakdown voltage over temperature, it will theoretically increase as temperature increases.

    Sebastian

  • 0 in reply to Sebastian Muriel
    TI__Intellectual 1780 points

    Hi Sebastian,

    This is for an automotive display application where the ESD761-Q1 is being used on some differential high speed video data lines. These video data lines are LVDS, but a DC-bias is applied to them as a wake-up method for the downstream display. Understanding the VBR is important for us to ensure we aren't sinking current which could kill our video signal upon applying the DC-bias. In this instance, cold temperatures is where the concern would lie.

    My customer also provided an example of another supplier who provides this information in the ECC table directly (see below). Is there any reason why we don't do the same?


    Regards,

    Andy

  • 0 in reply to Andy Snawerdt
    TI__Genius 14240 points

    Hi Andy,

    The Vbr thermal coefficient is more of a zener diode spec since they are made for normal operation in the breakdown region, our ESD diodes are designed for normal operation at a voltage below the breakdown where the diode only leaks nA.

    Even if the breakdown voltage lowered slightly, the max DC voltage recommended on the input is 24 V across the full operating temp range:-55 to 150C.

    From my undertstanding LVDS signals are low voltage < 5.5 V. Unless you're expecting a large common mode voltage that would bring the voltage on the line above 24 V there should be no concern, the diode wouldn't begin to breakdown and sink more than a few mA of current until ~33 V at the trigger voltage. 

    Regards,

    Sebastian