TL071/TL081

[Scott Bernardi]

A was the highest grade, C the lowest, so they were substituting a better part -
no fraud there, and lucky for the purchaser. The reason why they did it had to
do with yields. If you've got an order for 10,000 grade C parts, and your wafer
yields look like 15% A grade, 20% B grade, and 5% C grade, you'll use higher
grade parts to fill the lower grade orders because you didn't get enough in the
lower grade category!.  A's and B's sitting in bins don't make money!

Bjorn Julin wrote:

> >Same chip with different yields is probably the case with the 07x, >08x,
> >etc. When I was at PMI, we did a number of tricky things behind >the scenes
> >- >like take 12
> >bit DACs that didn't pass the specs and package them as 10 bit DACs. >I
> >remember
> >that we were getting such good yields on the OP27 A and B grade parts >that
> >we had
> >trouble getting enough C grade parts - so we just took the A's and >B's and
> >labeled
> >them as C's.
>
> ? If C grades was highest grade it was a fraud, if C was lowest
> i dont really understand why a company would mark better (a,b)
> grades as worser grades (C)??
> And then sell them to a lower price!!!
>
> Or i have missundertod the whole thang!
>
> BJ
>
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--
Scott Bernardi
sbernardi at home.net