Rounded Rectangle pads

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   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?

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
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: 5718	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.