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
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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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