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Discussion in 'Electronic Design' started by Jamie, Aug 18, 2011.

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  1. Jamie

    Jamie Guest

    We have a lot of older equipment we keep operating from plant to
    plant and also do some non conflict repairs on equipment that uses this
    747 Op-amp. It has always been a problem locating these chips and some
    times end up using a NTE replacement, which I really don't like to do
    because it's a crap shoot at times.

    I went on line the other day to locate some of these babies and I
    couldn't believe what I saw, Newark had over 1500 in stock of the
    UA types! The ones we have are LM but who cares, if they work its
    fine.. So I ordered 100 just to make sure, the price was right!

    It appears these LM747 are very destructive just from a slight
    over voltage on the inputs. It not only destroys the Op-amp, which
    would be expected but it also splits it in pieces if you don't have some
    sort of current limit on the Vcc.. ;)

  2. Joerg

    Joerg Guest

    Arrow, Avnet, Future. They all LM747 in stock, A H and J types. But at
    boutique prices.

    Digikey has the UA747CN for under a buck though, over 6000 of them.
    Those were the days, when a bang was still a real loud *BANG* :)
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