BGA Pad Oversize

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   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.

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tanne16 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 14 Dec 2015 Status: Offline Points: 8	Post Options Post Reply Quote tanne16 Report Post Thanks(0) Quote Reply Topic: BGA Pad Oversize 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.



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 6105	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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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tanne16 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 14 Dec 2015 Status: Offline Points: 8	Post Options Post Reply Quote tanne16 Report Post Thanks(0) Quote Reply 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.

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 6105	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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 - 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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