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BGA Pad Size Calculation

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robmeyer View Drop Down
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    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
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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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