[sdiy] Matched transistors - critical parameters?
ijfritz at comcast.net
Tue Feb 7 04:06:03 CET 2012
One reason sometimes given is that the newer (SMT) parts are not
monolithic, ie the devices are not on a common substrate. This makes the
thermal coupling worse, although it may not matter that much.
At 07:07 PM 2/6/2012, Matthew Smith wrote:
>What are the critical parameters of old matched transistor arrays, such as
>I've been looking at various modern ones, and the only thing that seems to
>stand out is that the hFE of the CA3096 is somewhat higher. (I'm comparing
>with the DMMT5551.)
>Is this a critical factor in, say, a VCF, or is it the actual matching
>that is of greatest importance?
>Just trying to figure out what the "magic" is that makes the old parts
>desirable over a nice little SOT-26 part costing somewhat less than half a
>ABN 16 391 203 815
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