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BGA Pad Size Calculation

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=1567
Printed Date: 07 Nov 2024 at 8:11pm


Topic: BGA Pad Size Calculation
Posted By: robmeyer
Subject: BGA Pad Size Calculation
Date 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



Replies:
Posted By: Tom H
Date Posted: 20 Feb 2015 at 9:14am
It is very important to note that IPC-7351 prefers the Maximum Material Condition for all BGA Land sizes; they do not use the Nominal Land Diameter, but do use the Maximum Land Variation Diameter (notice the Bold numbers in the Red box in the Chart “Land Variation” column).
 
 


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