Yes, of course, some applications needs the parts that are in the better
side of the distribution curve for a particular parameter and for a
particularly stringent application, as you mention :), but I think that
a 4046 seems a part that should not have to be so critical that even in
the same lot number some work, some don't, and it is hard to believe
that no alternatives existed on that time that could have avoided the
high costly selection process.
Regards,
Javier
Lux, Jim (337C) escribió:
On 9/27/09 7:22 AM, "Javier Herrero" <jherr...@hvsistemas.es> wrote:
Margina design? ;) Better said, very poor design.
Does not sound very good that same part, same lot code, sometimes work
here but not there, sometimes does not work at all... Extending it a
bit... sometimes will work at a given temperature, sometimes will not at
a given other.
Regards,
Javier
Robert Atkinson escribió:
The old King Radio (then Bendix-King now part of Honeywell) Silver crown
aircraft radios used 4046's in some of the synthesisers.
Not always marginal or poor design. Sometimes, you can't get the
performance needed with (any) part that simply meets the datasheet specs, so
hand selection is needed. Picking matched pairs is a time honored method
for instance.. In some cases, the mfr does the picking for you (RF power
transistors). In another case, there's an extremely low noise FET used in
some charge amplifiers that not only has to come from one mfr
(notwithstanding the 2N JEDEC number) but you want to buy a bunch and pick
the quietest one. High value resistors and leakage currents also come to
mind.
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HV Sistemas S.L. PHONE: +34 949 336 806
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