PNP Matched Pairs

[Jim Patchell]

    Hello Paul
        The THAT transistors should make excelent log converters.
Although, it may be posible that you might even want to select these
parts.  Their delta Vbe is 3mv max.  Until I can see a batch of parts, I
won't know just how many are up in that range.  But most importantly, they
seem to have low bulk resistance and are matched over a wide range of
collector currents.

    I am also interested in using them in OTA's and as current switches.
They look very promising, if they can be had.

    -Jim

Paul Maddox wrote:

> Steve,
>
> >
> >Has anyone tried the That Corporation transistor arrays.  They do
> >4 x NPN, 4 PNP, 2 NPN + 2 PNP and 4 NPN + 4 PNP arrays,
> >all 25v, 10mA, matched to 500uV. See...
> >
> >       http://kiosk.std.com/Newbury/thatcorp/icprod.htm
> >
>
> Nope, never even h=eard of them (didnt they used to make audio tape?)
>
> Anyone know if these are ok for Log convertors...
> they seem ok to me, but Im not too hot with transistor characteristics.
>
> Paul
>
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