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Part number with '77' prefix?

Discussion in 'Datasheets, Manuals and Component Identification' started by shrtrnd, Feb 13, 2013.

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  1. shrtrnd


    Jan 15, 2010
    Got two 14-Pin DIP's I'm trying to identify:
    SGS 7709393
    Fairchild 7709393
    I was leaning toward the old Fairchild FU5B series, but am confused by the SGS chip.
    I've got some old Fairchild FU5B77xxxxx, but they're all in can packages, no DIP's
    Is anybody familiar with either of these devices?
  2. woodchips


    Feb 8, 2013
    709 opamp?
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    how are those identifiers laid out? It could make all the difference.
  4. shrtrnd


    Jan 15, 2010
    I don't have the IC's with me at the moment. But I'll recheck them later.
    I found a website (reliability unknonw) that crossed the following simiilar parts:
    FU5B7710393 = 710HC
    FU5B7749394 = 749HC
    As you can see from the 2nd, 3rd, & 4th number characters in the string, like woodchips
    noticed, the logic would seem to be that my questionable devices should be LM709 Op Amps.
    I'll probably build a test circuit to test that theory sometime.
    I'm still curious about the whole FU5B77xxxxx numbering system, don't know how
    it originated, or the rational for it. Maybe some kind of miliary designation?
    I'll come back to this when I take a closer look at the chip identifier lay-out, and post
    it here.
    Thanks for the feedback.
    Last edited: Feb 14, 2013
  5. shrtrnd


    Jan 15, 2010
    Here's the update on the identifiers on the IC's above:
    (Fairchild Logo) 7709393 (first line)
    U6W (Date Code) 7035 (2nd line)
    It's a gold plated ceramic 14-Pin DIP

    7709393 (first line)
    SGS B (Date Code) 7418
    It's a plastic package 14-Pin DIP

    That's all that's on the IC package.
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