I don't believe a simple hot air gun setup will work for a BGA part
with 500 pads. You need to preheat the board, and use a bottom heater
to ramp up the heat as well as a top heater. And with more products
going Lead Free, it will take a lot more heat and a lot more complex
heating profile to properly reflow the parts.
I had worked on a BGA machine before, the big expensive automatic
type... Even then it would take a LONG time to properly create a
reflow profile to get maybe 95% success rate. (of course we were
working with like 1000+ pads) I can give you some tips and pointers,
but for only doing 1-2 a year, it can get pretty expensive
(especially with FPGA's) and frustrating when you fail at reflowing
the part.
--- In
Homebrew_PCBs@yahoogroups.com, "timbomcnuckle" <jaydag71@...>
wrote:
>
> hey!, I haven't used a hot-air station yet but I have done the
> over-reflow a bunch fo times and I would take the time investment
into
> making your own rather than the alternative- especially if you are
> only oding a few boards per year! Elektor did a great version of the
> taoster oven re-flow controlled with an AVR I think, lcd display,
> programmable curves, precision control (within reason),, I think the
> only complaint was lack of insulation, but you can always stuff with
> rockwool or something.
>
> I have used old style black&decker toaster-oven without any
> modification a few times but I got a better one now that I still
need
> to finish. gluk.
>
> --- In Homebrew_PCBs@yahoogroups.com, Harvey White <madyn@> wrote:
> >
> > On Tue, 02 Oct 2007 18:52:12 -0000, you wrote:
> >
> > >Recently, I started making electronic circuits as a hobby and now
> > >I want to do more complex stuff like FPGAs.
> >
> > That's ok, and presumably they don't come in PLCC carriers (a
shame),
> > but you might not want to use BGA's simply because of the
soldering
> > problem. Any other alternatives?
> >
> > No opinions otherwise, you're far ahead of my aspirations in this
> > respect. (if not others).
> >
> > Harvey
> >
> >
> > >For that I need to solder BGAs. I'm considering buying a hot air
> > >rework station. So far I'm looking at either
> > > Aoyue 968 http://www.aoyue.com/en/ArticleShow.asp?
ArticleID=359
> > >or
> > > Aoyue 99∗ http://www.aoyue.com/en/ArticleShow.asp?
ArticleID=375
> > > The first one has a digital display and a soldering iron while
the
> > >other one has a manipulator.
> > > I already have a good quality soldering iron. Do you think the
> > >manipulator would be more useful ?
> > >
> > > The goal is to be able to build prototypes with BGAs (maybe up
to
> > >500 pins). I only need to build like two boards a year for
myself,
> > >and I am not concerned about the time it takes, as long as I can
be
> > >reasonably sure that it will work.
> > > Or maybe, I should make a temp controlled toaster oven and
> > >dispense with the rework station already.
> > >
> > > Could someone with more experience share their advices ?
> > >
> >
>