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Rounded Rectangle pads

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chads108 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chads108 Quote  Post ReplyReply Direct Link To This Post Topic: Rounded Rectangle pads
    Posted: 30 Oct 2012 at 9:42am
I see in the PCB Design Optimization presentation that recommended maximum radius for rounded rectangle pads is 0.25mm with a 0.01 round-off.  Is there a recommended minimum radius before it gets so small that it wouldn't be of any advantage?
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 30 Oct 2012 at 10:51am
There is no recommendation on the minimum radius because the 20% of the pad width has been tested for the finest 0.4mm pitch component for SOP/QFP. The minimum pad to pad spacing is 0.15 mm (6 mils). Therefore the minimum pad width = 0.25 mm (10 mils) and the corner radius on that pad = 0.05 mm (2 mils).
 
So 0.05 mm (2 mils) is the minimum radius.
 
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