Mike,

Enlarging the corner pads would seriously affect co-planarity.  A better
approach seems to be to eliminate the corner pads. Many manufacturers are
doing this.

Bruce Misner

> ----------
> From:         Yuen, Mike[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.
> Sent:         Wednesday, October 17, 2001 10:59 AM
> To:   [log in to unmask]
> Subject:      [TN] BGA corner pad
>
> Greetings,
>
> I understand BGA reliability is a very complex subject. Folks had been
> doing DOEs for years trying to determine the significant factors
> involved. For most perimeter PBGA, corners joint seem to be the weakest
> link.  I wonder if anyone out there had done  studies on enlarging just
> the corner pads of a BGA to enhance reliability.
>
> Thanks,
> M. Yuen
>
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