jimlux at earthlink.net
Sat Aug 14 14:55:33 UTC 2010
Bob Camp wrote:
> Simply a few stories I thought I would share.
> Simulate design. Use manufacturer's published models. Build design. Note differences. Call manufacturer. Answer - switched die three years ago, Ft is now " much better " ( now 3x old parts ).
> Odd they never mentioned that to people who work for the same company.
> Simulate design, Build design, verify design, ship it for a few years. Odd things start to happen. Look at some parts. Package looks different. Ask around..... Line got moved to other side of big ocean. Process got " tweaked" beta is now 4x what it was.
> Again all inside the same company. Both cases were excused by industry standard specs that had no upper limit.
> We had whole departments devoted to tracking this sort of stuff. It still happened on a regular basis. 30 years later the specs on the devices and their published models are still the " old version " ones.
there are also designs that depend on "non-data-sheet" performance of
particular devices. There's a very low noise, very low leakage fet
popular in charge amplifiers. It has a JEDEC 2N number (which I can't
remember off hand), but only the ones from one particular company (in
England) actually work in the circuits, and even then, there's some hand
More information about the time-nuts