Rounded Rectangle pads

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   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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chads108 Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 17 Oct 2012 Location: Plano, TX Status: Offline Points: 35	Post Options Post Reply Quote chads108 Report Post Thanks(0) Quote Reply 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?



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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.