Aging is beneficial because it allows a part to physically relax into a shape that is appropriate for the way it is being operated... So, if a zener is going to be operated with no bias current, and at room temperature, sitting on a shelf for 30 years might be a plus... But not so much if the part is going to be run at 5ma bias, and a 55C operating temp. In that case, aging begins when the part is up to temperature, and power is turned on.
-Chuck Harris new wrote:
Question... do the old circuits get better with age? It would seem that the old standards would be much better now than they were when new. Is there any rule of thumb? Does a 20ppm/year circuit become a 10ppm/year circuit in say, 20 years? The industry uses voltage and temperature to simulate aging... so just 'aging' itself should work! The old survivors from the 70s, 80s and 90s should be very good! Willy
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