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beginner's IC question

Discussion in 'Hobby Electronics' started by Simon, Dec 10, 2006.

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  1. Simon

    Simon Guest

    Hi all

    Im a beginner to electronics, one of my hobbies is arcade gaming so Im
    learning to diagnose PCB problems.

    Quick question though - are there specific meanings for some of the
    prefixes on the chip numbers?

    For example, Im hunting for D43256AC-10L ram chips. At futurlec.com, I
    find "43256-10L - 32Kx8 CMOS RAM". Can I assume these are the same chip,
    just with a generic number? What do the D and AC mean? I also find
    UPD43256AC-10L chips at rockby - what does the UP mean?

    Im wondering if theyre the same chip, different manufacturing process or
    something.

    Thanks
     
  2. Phil Allison

    Phil Allison Guest

    "Simon"

    ** Just identification codes dreamt up by the makers really.

    Often it indicates the maker and the general class of device.

    LM = Natsemi linear, MJ = Motorola bipolar, TL = Texas Inst
    linear etc.


    ** Asian makers often omit the initial letters of a part number on packages.

    C1234 = 2SC1234, D1234 = 2SD1234, K123 = 2SK123 etc on
    transistors.

    UPC ( or uPC) & UPD ( or uPD) appear to indicate the part is made by NEC,
    or originated from them.

    Again, it may be often seen with the UP (or uP ) missing - so just C 2345
    or D12345 etc on ICs.

    Always look for the maker's logo on a package, sometimes it is a vital clue
    in working out what the part is.

    If you are asking for others to help you identify a part, describe the
    package and any logo you see in addition to the part number.


    ....... Phil
     
  3. jasen

    jasen Guest

    get the datasheet from the manufacturer or a third party and all will be
    revealed.

    use google with the chip's number (43256) and the keyword datasheet.

    Bye.
    Jasen
     
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