LM/UA747CN WOW!

[Jamie]

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!


P.S.
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..

Jamie

 

[Joerg]

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!

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.

P.S.
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..

Those were the days, when a bang was still a real loud *BANG*