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Calculator QFP Pad Stack Invalid Number |
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Stadler_s1 
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Joined: 22 Jun 2016 Status: Offline Points: 2 |
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 Topic: Calculator QFP Pad Stack Invalid NumberPosted: 22 Jun 2016 at 5:33am |
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found a little thing here. I Created a 176pin QFP with Datasheet. the Paste Mask Top created a -Size and the Pad Stack Manager says Error.   |
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Jeff.M
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Joined: 16 May 2012 Location: San Diego Status: Offline Points: 477 |
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Posted: 22 Jun 2016 at 8:05am |
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There are couple things that might lead to a negative paste mask value
The b dimension seems pretty small. Are you sure it's 0.08 mm? I checked a few comparable datasheets and the terminal width is typically 0.17 - 0.27. This small dimension with a small side protrusion goal and a shrink on the solder mask could add up to a negative.
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718 |
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Posted: 22 Jun 2016 at 8:07am |
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The only thing I see that's wrong is the "b" lead width has no tolerance and it should, but that would not cause the error but it will cause a bad Land Pattern Footprint. An insufficient pad width.
Are you using V2016.07? Here is what I get when I enter your dimensions -  |
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