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The Knowledge and Know-how Connection
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June 19, 2013
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Views: 2416
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At a SMT table top show I attended in Austin, there was a talk about QFN/BTC components. Their rule was small holes in the ground plane and about 50% solder coverage. This became the 25% rule that we use. A strip 25% of the width and length of the ground pad is removed leaving a 4 pane solder pattern that is about 57% of the area. It works great for us in both leaded and lead-free solder applications.
Will Dauchy, Suntronic, Inc, USA