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BGA Pad Oversize

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=1913
Printed Date: 25 Dec 2024 at 7:10pm


Topic: BGA Pad Oversize
Posted By: tanne16
Subject: BGA Pad Oversize
Date Posted: 21 Jun 2016 at 11:17am
Hi,

I was wondering why is there a pad size oversize on certain BGA depending on their ball size ?

I tried a 0.50 mm pitch BGA with a ball size of 0.30 mm and the pad oversize was at 0 mm and as soon as I put the ball at 0.50 mm the pad oversize became 0.05 mm.

Is there a reason or is it simply a bug?

It made our footprint pads bigger when it wasn't necessary.



Replies:
Posted By: Tom H
Date Posted: 21 Jun 2016 at 11:27am
For the non-collapsing BGA ball, here are the Ball Sizes / Pad Sizes.
This is when the pad size round-off = 0.01
  • 0.70 / 0.58
  • 0.60 / 0.50
  • 0.50 / 0.45
  • 0.45 / 0.41
  • 0.40 / 0.37
  • 0.35 / 0.33
  • 0.30 / 0.24

Are you sure you're using Library Expert V2016.07?




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Posted By: tanne16
Date Posted: 24 Jun 2016 at 7:56am
Hi, I am using V2016.02
There is an oversize in the setting that's coming up. Is there a reason for it ? If you create a reference BGA with a Pitch of 0.65 and a nominal ball size of 0.4mm in the oversize ball size it says 0.05mm  by default instead of 0 but if you create the same with a 0.3mm ball size there is no oversize.

Posted By: Tom H
Date Posted: 24 Jun 2016 at 8:02am
V2016.02 is 3 months old.

You should update to V2016.07 or better yet, V2016.08 pre-release - http://www.pcblibraries.com/downloads%20" rel="nofollow - www.pcblibraries.com/downloads

Install the latest version and then let's set up a webcast to answer all your questions.

We offer live webcast training 8:00am - 2:00pm PDT 7 days a week.


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