what is this ic please help?

Discussion in 'General Electronics Chat' started by empman12, Apr 27, 2014.

  1. empman12

    Thread Starter New Member

    Apr 27, 2014
    2
    0
    hi
    i want repair a board with an unknown ic.what is this ic?
    please help me

    [​IMG]
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,145
    1,791
    It is likely to be a custom part with customer specific markings. It is manufactured by ST Microelectronics. If I had to guess it would be a microcontroller with an internal program in ROM or Flash. 30991 might be a date code for March 9th 1991 or September 3rd 1991 but that is only a guess.
     
  3. Dritech

    Well-Known Member

    Sep 21, 2011
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  4. #12

    Expert

    Nov 30, 2010
    16,298
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    In this case, clicking the "Thanks" button means, "I agree".
     
  5. empman12

    Thread Starter New Member

    Apr 27, 2014
    2
    0
    i cann't find any document or datasheet about this part.what is this part?
    is it microcontroller ?or buffer ?or motor driver ?or etc...?
     
  6. Papabravo

    Expert

    Feb 24, 2006
    10,145
    1,791
    Of course you can't find any information. It is a proprietary custom part manufactured by ST Microelectronics for a specific customer. The specific customer does not want any information about the part reveled to the public. In fact if any information were to leak out there would probably be lawsuits and litigation in the gazillions of dollars at stake.

    We can only guess and there are damn few ways to confirm the guesses. If you have the resources and the time you can break open the package and examine the chip with an electron microscope to decode the logic and the memory on the chip. This might cost several million dollars, but I am told it can be done.
     
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