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  • TI Thinks Resolved

QFN16 or WQFN16 chip with marking TI 851 (A2YVF)

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Replies: 3

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Hello,

We have a part to change on a small board which MPN is sadly not visible due to damage, the only visible marking at about the middle of the package is TI 851 and there is a production code below (A2YVF). It is QFN16 or WQFN16, and essentially it does convert a 80MHz frequency or related capacitance to 0-3.0V voltage.

Could you kindly let us know what the MPN is?

Thank you.

  • Hello Bidault,

    If you have a schematic or a block diagram of your system, try to see what the failed part may do.
    Then use the parts lookup, search for the 851 marking.

     

    From parts lookup;
    http://www.ti.com/packaging/docs/partlookup.tsp#divline     

    Search by
    Marking on the part     TI part number  

    Search phrase
         851

     

    Yields devices with 851 in part number.

    Then look for 16 pin package, QFN.  An R designator is a wqfn.

    ADS7851; from its product folder, packaging tab.

     

    http://www.ti.com/packaging/docs/partlookup.tsp?parent=pf&partNumber=ADS7851IRTER#divline

     

    Part number

    Marking

    Package | Pins

    Status

    Description

    ADS7851IRTER

    7851

    RTE | 16

    ACTIVE

    SAR ADC, Dual, 1.5 MSPS, 14 Bit, Simultaneous Sampling

    Perhaps this is the device?

     

    Regarding A2YVF
    LTC(Lot Trace Code) number.

    TI’s LTC consists of seven(7) alpha-numeric values.
             example 12ABCDE

     

    I hope this helps.


    Best Regards,

    Ed Walker

  • In reply to EdWalker:

    thank you for the return

    Sadly there is no schematic, otherwise it would be easier.

    I know for sure it cannot be this ADC because the board has no communication bus, it only receive a 3.3V power and provide a 0 to 3V output according to the reflected RF signal amplitude.

    So i suspect the part is an RF log. amp. detector, the operating frequency of the circuit is 80MHz.

  • In reply to BIDAULT Hoel:

    Hello Bidault,

    With the information provided there are no other suggestions we can provide.
    If or when you may have more details, please reply back to this thread or post again.

    It's very hard to repair an electronic assembly, that has let the smoke out of an IC, without a schematic.
    I wish you luck with this endeavor. 


    Best Regards,

    Ed Walker

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