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DS26C31T: Low resistance between #2/#3 and GND on some ICs

Yoshikazu Kawasaki
Intellectual 575 points
Part Number: DS26C31T

Hello,

My customer has been using DS26C31T.  The resistance between #2/#3 and GND is around 1.8MOhm when there is no power, but some ICs have a few kOhm or even a few Ohm after working for some time.  It works well even though the resistance is low, but do you think the ICs have been damaged by EOS or ESD etc?

Best Regards,

Yoshikazu Kawasaki

  • 0
    TI__Guru 65882 points

    Kawasaki-san,

    There is another thread posted your colleague, Kurumi Hasegawa, where this was addressed. I will place the responses from myself and my colleague, Hao Liu.

    "I will say that with a significant drop in impedance on bus pins to GND, this can point to some kind of electrical overstress damaging an internal component and causing a short/low-impedance path. But I want to verify the conditions of your device before we jump to that conclusion. So is it possible to measure the output to GND resistance on the same unit, and then another known "good" unit while they are both unpowered?"

    "Thanks for your detailed feedback. In this case, the ICs do look damaged to me. Do you think severe ESD events might happen in applications? Generally adding external TVS or serial resistors can help limit excessive current flow into the device."

    Ultimately, Hasegawa-san mentioned that it was likely electrical overstress and that the customer would look into using TVS diodes and other protection devices.

    Regards,

    Eric Hackett