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SMT electronics assembly manufacturing forum.


Stencil Aperture Size vs Copper Pad Size

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#76127

Stencil Aperture Size vs Copper Pad Size | 8 August, 2016

What should be solder paste stencil aperture proper size in comparison with PCB copper pad for lead free technology? When designing PCB foortprints I was using solder paste pad undersize of 2.5 mils (0.06mm) per side (solder paste pad size was 2.5 mils per side smaller that copper pads size) for all pads. Is it value acceptable? Can the same value of solder pads undersize be applied to all pads on the PCB?

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#76128

Stencil Aperture Size vs Copper Pad Size | 9 August, 2016

this really depends on the pad sizes. You can see 15 different pad sizes for the same component package. Take a look in IPC 7525. I am attaching an article as well, so you can get an idea.

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