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From: "Da Man"
Subject: Re: Total lack of response re SMT query - What gives ?
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Date: Tue, 31 Dec 2002 23:46:20 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 19:46:20 AST
Your post reminded me of the new SMT IC's avalible - they are the bare die,
with 8 or 9 (in the packages I looked at) BGA balls on the bottom. Now for
the kicker, they are only 500 um (.5 mm) in lenght per side :-( (maybe they
were 800um, I can't remember). The package was called micro BGA. Try hand
"Spehro Pefhany" wrote in message
> On 30 Dec 2002 16:00:50 GMT, the renowned firstname.lastname@example.org
> (Gibbo) wrote:
> >Spehro wrote:
> >>The big discussions (and a lot of problem solving) on SMT were (IIRC)
> >about 15+ years ago in the West and earlier than that in Japan, it's
> >pretty old-hat these days.
> >So how come no-one seems to agree on it ?
> >It clearly isn't that "old hat" !
> In the early stages of any technology, there is typically a lot of
> information sharing, especially when the technology is deemed to be of
> strategic importance over a range of companies that are not
> competitors, as SMT was. There was government-sponsored sharing of
> information. Then it gets into commercialization and there is less of
> it going on. Finally, when it matures you have to poke around dusty
> books, experienced old guys and overweight salesmen to find the
> information you need- there are few trade secrets and few reasons to
> publish the information- learning is on-the-job. SMT is in phase II.
> ;-) Automated thru-hole assembly is in the third phase.
> Back in the days when it was being introduced to North America, it was
> seen as the key to bringing higher levels of automation and higher
> quality to electronics manufacturing, as well as increasing sales by
> making products smaller and therefore less expensive. Very much a case
> of catch-up with the Japanese giants. It's fulfilled much of that
> promise in the consumer electronics industry of course, you can hardly
> imagine a cell phone being made without SMT, but THT hangs in there
> for some things regardless.
> For prototyping and rework- sure there are plenty of ways of doing it,
> and they generally all work well enough. My eyes are such that I don't
> need a Mantis to solder, I just get closer. I have a super little 6x
> Zeiss magnifier for inspection and bright lights.
> When you get into production there are only a few choices of machinery
> and I think just one basic method of soldering (IR Reflow) with the
> death of vapor-phase soldering.
> Best regards,
> Spehro Pefhany
> "it's the network..." "The Journey is the reward"
> email@example.com Info for manufacturers:
> Embedded software/hardware/analog Info for designers:
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