I would like to get a new copy of IPC 7095. Who is the chairperson for that
committee?

Thanks,
M. Yuen

                -----Original Message-----
                From:   Gabriela Bogdan [mailto:[log in to unmask]]
                Sent:   Monday, March 20, 2000 4:43 PM
                To:     [log in to unmask]
                Subject:        Re: [TN] Voids in BGA Balls after reflow

                Bob,
                You can search the TechNet archives for voids in BGA solder
balls.
                Max .allowed voids is about 20% of the ball volume, if I
remember well from
                the draft of IPC7095.
                Bad thing is when the voids are at the interface between
ball and component
                pad or board. I have also a "High end" x-ray equipment, and
to my great
                amusement I can make voids appear , disappear and grow
depending on voltage
                and current. Make sure that your picture is not "overworked"
and that what you
                see is the real thing. If it is, it seems bad to me. Just
for comparison, you
                can perform a cross section on a ball with big voids.
                Gaby

                Bob Perkins wrote:

                > Hello Technetters
                >
                >         Recently with the help of a high end piece of
x-ray equipment we
                > have noticed voids in the spheres of the bga after reflow,
"see
                > attachment-file".  Has anyone seen this before, or has any
idea how the
                > voids are created?  Also does anyone know if this is a bad
or good thing?
                > Does anyone have any recommendations to the profile?
                >
                > Thanks
                >         Bob Perkins
                >         Automation Technician/Manufacturing Engineer
                >         Aimtronics
                >         [log in to unmask]
                >
                >  <<wboard6.jpg>>
                >
                >
------------------------------------------------------------------------
                >                   Name: wboard6.jpg
                >    wboard6.jpg    Type: JPEG Image (image/jpeg)
                >               Encoding: base64


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