BGA Pad Oversize

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   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.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
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: 5716	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?
	Stay connected - follow us! X - LinkedIn

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: 5716	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.
	Stay connected - follow us! X - LinkedIn