Cedric,
I can give you half an answer. :(
Yes, there are solder pastes (at least one) that is really great for
helping defeat head on pillow in air atmosphere lead-free reflow. Of
course more solder paste, good seating of the component in the solder
paste, a reflow profile suited to helping defeat this defect, flat
boards and working with (and/or beating your component supplier over the
head) to get a better suited overmold all help too.
Bev
RIM
PS: What if you were old and French? Dewey might have an answer. :)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cedric ORAIN
Sent: Wednesday, April 21, 2010 2:39 PM
To: [log in to unmask]
Subject: [TN] Head in Pillow and grapping effects mitigation without
Nitrogen
Hello all,
Very fine pitch BGAs (typically 0.5mm) and 0201 chips are becoming
common in
our company for some months.
We recently have to face with new defects type such as grapping effect
and
head in pillow defect.
The solder paste we use has been qualified for even smaller component
(WLP,
0.4mm pitch) but in Nitrogen atmosphere.
I'm now wondering if this solder paste is suitable with Air reflow. I'm
also
wondering if a solder paste suitable in that case even exists.
Having a look to this study from intel (link hereunder, page 31), I
found
that the people from Intel are recommending a solder paste volume larger
than 2000 mil^3 as a minimum.
http://edc.intel.com/Download.aspx?id=3044&returnurl=/default.aspx
That is, off-course, impossible for a VFBGA (which solder paste deposit
is
closer to 900mil^3) but this reading makes me feel uncomfortable.
So the question is: is it possible to find out a solder paste which is
suitable for VFBGA assembly in Air reflow?
If it is not against TechNet rules, have you some solder paste
references
that you could advise?
Here are some additional details: ENIG PCB finition, SAC305 Alloy.
Cedric ORAIN
Technical Director
Electronic Manufacturing Services
www.inovelec-groupe.com
PS: I'm very new and I'm also French. I wish it will not be too much for
you! Anyway, thank for being patient if I have difficulties to
understand.
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