[sdiy] uA726 transistor array

[patchell]

Ian Fritz wrote:
>     The only difference between the THAT 1xx series of transistor arrays and

> >others is that they used dialectric isolation.  I don't know what problems
> >this
> >might create or how it might perform thermally.  As far as I know, the new
> >THAT
> >2xx series is going to be juntion issolated, or at least, that is what I
> >thought
> >I read about them.
>
> Interesting point.  But unless the devices are dielectrically isolated from
> the substrate, the high thermal conductivity of Si should keep the
> temperature very uniform.

    That is exactly what they do, if I remember the process correctly.  Nobody
does it anymore.  Harris was the last company that did dialectric isolation, and
they are no more.  It was very expensive to do (compared to other processes).  As
I recall, each transistor sat in it's own SiO2 well, which kept leackage down.

--
 -Jim
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