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Where to look for datasheets?

Discussion in 'Electronic Basics' started by Wes, Feb 20, 2009.

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  1. Wes

    Wes Guest

    I was looking at a pcb I removed from a dead microwave. I noticed a TI chip SN102977AN. I
    wondered what it is. Googling gets lots of hits that are useless. Generally sites
    showing someone else googled for it or someone wants to sell me some w/o a datasheet.

    So what are the best sites to search? If you know what it is, that would be nice to know

  2. Google is the best first step of course, then I usually add "pdf" to the end
    of the search which often helps, or even ".pdf".
    In this case no luck though.

    Next step for me would be to drop the trailing letters, so SN102977 in this
    case, but again, no luck. and didn't help either.

    I use this site occasionally too, but again, no
    luck on your part.

    Good luck.

  3. Ecnerwal

    Ecnerwal Guest

    For non-obsolete parts, newark, mouser, or digi-key all have links to
    data sheets.

    If you can identify a manufacturer (and sometimes even if you cannot)
    going to (in this case) the texas instruments (TI) website might be a
    good place to start. However, they return no results for that number,
    parts of that number (remove suffix - remove prefix - remove both), or
    that number (or parts of it) from other manufacturers in their
    cross-reference search. See below.

    For parts in consumer goods, it's not unusual for the part to have a
    "customer number" rather than a real number, precisely to keep you from
    being able to look it up. When you order 100,000 chips to put in your
    microwave ovens, it's pretty simple to specify that they will be part
    number "whatever you want printed on them" and it will happen. On the
    other hand, sometimes it's hard to tell a date code from a part number.

    Google (and other search engines) is too polluted by the "data sheet
    spam sites" to be any good at all.
  4. Rich Grise

    Rich Grise Guest

    With a number like that, it's most likely the custom mask-programmed

    What are you trying to accomplish?

  5. Rich Webb

    Rich Webb Guest and are
    two others (neither of which has a part close to that number listed).
  6. I second what Rich said. It's a custom programmed microcontroller. You can
    only get data for the basic CPU type if you can guess what it is by looking
    at various TI CPU's and the location of their power and I/O pins.

    But you can't get an exact replacement anyway, or use it anywhere else. If
    it's in an old ceramic case you can crack it in half to expose the die and
    make a desk decoration out of it. If you have a microscope, use it to show
    kids what chips looked like with only 3-layer metal.
  7. Wes

    Wes Guest

    Actually I thought it was a support chip. Looks like another chip is the custom uP.

    I'm just mining a few parts out of wrecked boards. I'm trying to get back into playing
    with electronics and was wondering what that chip was.

    Might as well start another post.

  8. Rich Grise

    Rich Grise Guest

    I once made a tie-tac out of a dead 8751 chip. ;-)

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