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Chip Identification

Discussion in 'Electronic Basics' started by Chris W, Feb 18, 2005.

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  1. Chris W

    Chris W Guest

    I'm going through all these chips I got with a brad board on ebay,
    trying to find out what they all are. Instead of just listing the part
    numbers of the ones I can find, let me as some general questions about
    the numbering conventions and then maybe I can find them myself. I have
    been looking the numbers up on digchip.com. Most of them are of the
    format SN74LS... Can someone tell me what the SN and the LS indicate?
    Then some don't have the LS.... so far I have found all of the ones that
    start like that But there are some that start MH74, M74, or DV74, and I
    can't find those numbers. Then there are some that are simply 7475, are
    those the same thing as a SN7475? Some have a suffix of P or PC and I
    can't find any of the SN74LS.... numbers that have a P or PC suffix on
    digchip.com. I will list 2 part numbers that I can't find and are very
    strange. MHB2114, UYC7483, and uPB74LS11C. On that last one the u is
    the Greek letter used as the micro prefix.

    --
    Chris W
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  2. Andrew Holme

    Andrew Holme Guest

    Those are 74 series TTL logic (except for 2114 which is a 1024 x 4bit static
    RAM).
    LS indicates Low power Schottky.
    The prefixes indicate manufacturer.
    The suffixes indicate package.

    Try searching for the chip numbers on Google. You'll find datasheets. Try
    searching with .pdf on the end of the chip number.
     
  3. Rich Grise

    Rich Grise Guest

    Supposedly, "SN" stands for "Silicon Network". M is usually Motorola, or
    used to be.

    The MHB2114 is a memory chip, I think, and the UYC7483 is probably some
    kind of buffer, or it could be just a 7483, and the uPB74LS11C looks like
    it's probalby just a 74LS11.

    Good Luck!
    Rich
     
  4. The *74* chips are TTL or TTL-ish logic.

    The letter prefix indicates the manufacturer - SN is Texas
    Instruments. The letter suffix indicates the package - the package
    codes vary between makes.

    Any letters in the middle (like "LS") indicate some variations in the
    internal circuits.

    In general, if all the numbers are the same, the parts have the same
    logic function.

    No middle letters = original fairly power-hungry version. Some parts
    in this series are still available, I think.

    L = low power, slow (and obsolete)

    LS = Low Power Schottky. Low power, but similar speed to the
    original.

    ALS = Advanced LS

    C = C in the middle letters indicates CMOS - very low power. (and just
    "C" is fairly slow)

    HC, AC = faster CMOS parts

    HCT, ACT = CMOS parts with the inputs modified to work reliably with
    bipolar TTL.

    To find data on these parts, check Texas Instruments, Fairchild or On
    Semi's websites, or do a google for <part number> +datasheet.
     
  5. Lord Garth

    Lord Garth Guest

    I recall SN as the Texas Instruments prefix Rich...
    http://www.interfacebus.com/logic_prefix.html

    Motorolla had their 'Batwing' M

    Then there's the suffix:
    N for plastic (really epoxy)
    J for cerdip (both halves were ceramic surrounding the lead frame)
    P for ceramic (hermetically sealed types)

    One could really wear off the finger tip skin by handling too many
    J parts!
     
  6. Rich Grise

    Rich Grise Guest

    Well, yeah, and TI decided on the letters "SN" because they stand for
    "Silicon Network." I read that in some TI blurb, so I thought it was like
    a given.

    Sorry.
    Rich
     
  7. Lord Garth

    Lord Garth Guest


    Do you recall TI's multivoltage (probably PMOS) UV EPROM, the TMS 2716?
    TMS stood for Too Many Supplies rather than Texas (Instruments) Memory
    Systems.
     
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