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Rounded Rectangle pads

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Allegro
Forum Description:
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=645
Printed Date: 26 Oct 2024 at 10:24am


Topic: Rounded Rectangle pads
Posted By: chads108
Subject: Rounded Rectangle pads
Date 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?


Replies:
Posted By: Tom H
Date 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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