[sdiy] SSM2164 last time buys, Coolaudio

[George Mattson]

Not really.
It can take up to 60 days to run a lot through a fab. What survives that
process goes to test and assembly. The die are tested for basic operation
while still on the wafer. Those that fail get marked with an ink dot prior
to sawing. 
The operational die get mounted to lead frames and thrown into an oven for
thermal stress testing. The testing is done by a computer. Those that fail
under a heat load get tossed. There can be several products on the same
wafer. Same design. Some just work better than others. i.e. clock faster,
have better operational characteristics, etc. Those are all mapped by the
computer and sorted. Then, the part numbers are assigned based on the tests
(mil spec, etc) The injection molder gets fed each batch of parts that meet
specific operational criteria and assigned the part number, batch codes,
date, etc. at that time.


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Colin f
Sent: Friday, February 25, 2011 3:49 PM
To: 'SynthDIY'
Subject: Re: [sdiy] SSM2164 last time buys, Coolaudio

 
> It's the date the that the date is printed. Usually, right after the 
> plastic is injection-molded over the lead frame.

Thought as much.
Bit sneaky though.

Cheers,
Colin f


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