BGA Pad Size Calculation

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

   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

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
robmeyer Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 04 Oct 2012 Status: Offline Points: 113	Post Options Post Reply Quote robmeyer Report Post Thanks(0) Quote Reply Topic: BGA Pad Size Calculation 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



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