PCB Libraries Forum : BGA Pad Size Calculation https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 05:23:31 +0000 Fri, 20 Feb 2015 09:14:57 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1567 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[BGA Pad Size Calculation : It is very important to note...]]> https://www.PCBLibraries.com/forum/bga-pad-size-calculation_topic1567_post6363.html#6363 Author: Tom H
Subject: 1567
Posted: 20 Feb 2015 at 9:14am

It is very importantto note that IPC-7351 prefers the Maximum Material Condition for all BGA Landsizes; they do not use the Nominal Land Diameter, but do use the Maximum LandVariation Diameter (notice the Boldnumbers in the Red box in the Chart “Land Variation” column).
 
 
]]> Fri, 20 Feb 2015 09:14:57 +0000 https://www.PCBLibraries.com/forum/bga-pad-size-calculation_topic1567_post6363.html#6363 <![CDATA[BGA Pad Size Calculation : Hello,When I understand the documents...]]> https://www.PCBLibraries.com/forum/bga-pad-size-calculation_topic1567_post6360.html#6360 Author: robmeyer
Subject: 1567
Posted: 20 Feb 2015 at 12:57am

Hello,

When I understand the documents I could download from your side and the IPC-7351B correct, then the Pad Size for a BGA with a 0.6 mm Ball should be 0.45mm. But the library expert make the Pads 0.5 mm. I think this is a bug.
 
Or did I oversee something?
 
Thanks
Robert
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