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Absolute maximum rating of ULQ2003

Masami Michino
Genius 5070 points
Other Parts Discussed in Thread: ULQ2003A


Dear, All

A question about absolute maximum rating of Vi of ULQ2003A.
There is a regulation of the greatest for absolute maximum rating of Vi of ULQ2003A, but there are no regulations of the minimum value.
A customer is considering to change UPA2003GR made by Renesas.
UPA2003GR prescribes the minimum value of absolute maximum rating of Vi.
minimum value of absolute maximum rating of Vi :-0.5V
Can I regard the minimum value of absolute maximum rating of Vi of ULQ2003A as the same voltage as UPA2003GR?

Thanks, Masami M.

  • 0
    TI__Mastermind 24485 points

    Hello Masami-san,

    So if I understand correctly, the customer would like to know if the input voltage (Pins 1-7) on the device can handle -0.5V, is this correct?

    Are they concerned about negative transients when the switching level decreases?  

    I would expect that the device would be just fine with some negative transients. I may be able to get into the lab to test out a few samples. Would a few test results be enough, or do they absolutely need it to be guaranteed by the datasheet?

    Best,
    Michael

  • 0 in reply to Michael J Schultis
    Genius 5070 points

    Hi, Michael-san

    Thank you for your support.
    They're asking whether an undershoot of inputs destroys at -5V.
    When it's possible because there is a measurement error, they would like to know even how many V the undershoot is no
    problem.
    They should know the force value, and don't need mentioning to the dataSheet.

    Thanks, Masami M.

  • 0 in reply to Masami Michino
    TI__Mastermind 24485 points
    Masami-san,

    After looking at Renesas website, it looks like the UPA2003GR is EOL.
    www.renesas.com/.../UPA2003GR.jsp
    Am I mistaken?
    And just so you know, we have no plans to EOL our ULN2003 device.

    I should be able to get into the lab to test this, but it may be Monday or Tuesday when I am able to get to it.
    To be clear, are they looking to see that the device is ok at -0.5V or -5V?

    Best,
    Michael
  • 0 in reply to Michael J Schultis
    Genius 5070 points

    Hi, Michael-san

    Thank you for your support.

    >To be clear, are they looking to see that the device is ok at -0.5V or -5V?
    I'm sorry.
    I took TYPO.
    -0.5V is right.

    >After looking at Renesas website, it looks like the UPA2003GR is EOL.
    Yes, you are right.

    >And just so you know, we have no plans to EOL our ULN2003 device.
    They're considering ULQ2003A, now.

    Thanks, Masami M.

  • 0 in reply to Masami Michino
    TI__Mastermind 24485 points
    Masami-san,

    Let me test a few samples in the lab. Please allow a day or two for me to gather this data in the lab.
    We have no plans to EOL the ULQ2003A device either.

    Best,
    Michael
  • 0 in reply to Michael J Schultis
    TI__Mastermind 24485 points
    Hello Masami-san,

    I measured a couple of devices.
    The device should easily be able to tolerate -0.5V, especially if its just a transient.
    The biggest concern is biasing the emitter to base diode. This diode just barely begins to turn on around -0.5V, but begins to turn on more as the voltage exceeds -0.5V. Even if the input voltage goes down to -1V and its just a transient, then I would still be confident that the device would be fine.
    The conclusion is that the device should be able to handle -0.5V on the input without a problem, especially if its just a transient voltage spike.

    Best,
    Michael
  • 0 in reply to Michael J Schultis
    Genius 5070 points


    Hi, Michael-san,

    Thank you very much for your support and reply.
    I answer it to the customer.

    Thanks, Masami M.