BGA Pad Size Calculation

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   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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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: 5718	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).
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