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July 2005

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DesignerCouncil <[log in to unmask]>
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John C Laur <[log in to unmask]>
Date:
Wed, 27 Jul 2005 15:54:34 -0500
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"(Designers Council Forum)" <[log in to unmask]>, John C Laur <[log in to unmask]>
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All,

Wide conductors are great, BUT, wide conductors on a fine pitch QFP can
cause bridging.  In affect you solder mask define the pads with the wide
traces creating solderable surfaces that may be ~4 mils closer than
intended.  It happens when power and ground conductors are set up wider
than the signal conductors.

John Laur
Engineering Analyst Sr, HW
Information Platforms Business (IPB)
Rockwell Automation / Allen-Bradley
1201 South Second Street
Milwaukee, WI.  53204-2496  USA

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