Though it is usually better to have a little extra
space, just in case, it would depend on which tools you plan to use for
the rework.  Which ever way you go, just make sure the rework tools have
sufficient clearance to perform the tasks without disturbing nearby
components.

                Cobey Schmidt
                VisionTek
                1175 lakeside Drive
                Gurnee, IL 60031
                [log in to unmask]
<mailto:[log in to unmask]>
                (847) 360-7566 voice
                (847) 360-7443 fax

                                -----Original Message-----
                                From:   Wallisch, Ernst
[SMTP:[log in to unmask]]
                                Sent:   Thursday, June 11, 1998 10:06 AM
                                To:     [log in to unmask]
                                Subject:        [TN] BGA periphery
clearance
                                Importance:     High

                        Fellow Technetters,

                                I have been debating with my design
groups about the usefulness of
                        leaving 0.150" to 0.200" of clearance around
BGAs to facilitate rework, if
                        required.  The design groups wish to use this
real estate for other devices,
                        ignoring rework requirements.

                                My question is this:  Is it better to
have a  "keep-out" area around
                        BGAs for rework, or use up all available space
around the BGA for a
                        preferred design?

                        Thanks in advance,

                        Ernst Wallisch
                        Manufacturing Engineering
                        Computing Devices Canada
                        [log in to unmask]


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