[time-nuts] TAPR TICC boxed (input protection)

Bob kb8tq kb8tq at n1k.org
Tue Apr 11 07:46:45 EDT 2017


> On Apr 11, 2017, at 7:05 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> David wrote:
>> I ended up qualifying 2N3904s based on manufacturer and lot and I
>> think we ended up using ones from Motorola.  I wish detailed process
>> information like National had was available from every manufacturer.
> It is, if you ask the process engineers for it.  (From the Big Boys, that is.  These days it seems discrete devices are being fabbed by dozens of "garage" operations.  I can't speak for them, and wouldn't think of buying product from them.)

If you dig into where your simple discrete part was made, you might be surprised. That’s even true of outfits you would
consider to be a “Big Guy” from days gone by. The real answer to selection today is to buy the automotive part.
That’s about the only thing anymore that locks down the sourcing, testing, and the process. If you buy a “normal” part,
it might have been made anywhere by just about any process. Yes, that’s scary and it raises a lot of questions. It is
a change that has happened over the last decade or two without a lot of publicity. 


> Best regards,
> Charles
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