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Original question:

Power down protection on input

SN74LVC2G125: Seems to be broken

user5339789
Intellectual 590 points
Part Number: SN74LVC2G125

Hi, 

We are facing that this parts could be broken.

We are using this tri-state buffer from TTL (Optical receiver) to power device enable, Vcc is 5V.

During tested whole a board that is high power pulse generator (over 10A), this parts seems to be broken when power up.

Phenomena is like latch-up because no output and VCC current is 600 -700mA since we found could be failed.

We believe that unique feature it has, input protection even if Vcc=0, therefore it can use for power generators.

Anyway, it may be caused by hard spike noise or higher surge voltage we guess. And failure mode may be latch up.

Does it make sense?

regards, Keiichi

 

 

  

  • 0
    TI__Mastermind 24485 points

    Hello Keiichi,

    If there is a large voltage or current spike in the system that simulates a latch-up like event, then yes, it is very possible that this event could catastrophically damage our device.

    The Latch-up of this device can meet 100mA spikes without latching up, but if there are larger events then the device is not guaranteed to continue working, and is likely to fail.

    If you are injecting 10A into the board (assuming my understanding is correct), then this very well could be what is causing the failure of the LVC2G125 device.

    Best,
    Michael

  • 0 in reply to Michael J Schultis
    Intellectual 590 points

    Michael,

    Many thanks for your quick response.

    Your comment is highly appreciated.

    regards, Keiichi