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Paste Mask Question |
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vavouris 
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Joined: 18 May 2018 Status: Offline Points: 4 |
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 Topic: Paste Mask QuestionPosted: 24 May 2018 at 5:50am |
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Hi,
I'd like to ask what is the general guideline for paste stencils. Should the stencil be same size as the pad, smaller or greater? I know that in BGA packages we want very few solder paste on the pad. And on other packages, I was creating a paste mask figure 70% of the pad. I am a bit confused now, and I don't know if should continue to do that or leave it 1:1 and let the assembly plant deal with it. Thanks, Theocharis
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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: 24 May 2018 at 6:08am |
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For Standard SMD pads the Paste Mask aperture size is 1:1 scale.
For Thermal Tab pads the Paste Mask Reduction is between 40 - 60%. |
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vavouris
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Posted: 24 May 2018 at 6:15am |
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Thank you! That was fast.
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Tom H
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Posted: 24 May 2018 at 6:19am |
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If you use Rectangle Pad Shape, the Paste Mask aperture will be Rounded Rectangle, so you might as well use Rounded Rectangle for the pad shape too.
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