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Are these stencils suitable for use with LGA packages?


#1

Just curious. Reading the application notes for a LGA part I want to make a stencil for, the manufacturer recommends stencil thicknesses from 0.125mm to 0.36mm. Obviously, the plastic stencils sold by Pololu are much thicker. Anyone had success using these stencils with BGAs?


#2

Hello.

We have several repeat customers who use our stencils with BGAs, but I wouldn’t recommend it. I think our stencils are suited to 2-layer PCBs with a few dollars of parts on them; by the time you’re talking about BGAs, you’re probably doing a multilayer board with more expensive parts, plus you can’t just touch up the parts where the print wasn’t as good as you would like.

Also, you should check your math: our stencils are thinner than 0.125mm. One mil is about 25 microns, so our 3-mil stencils would be about 75 microns, or 0.075mm, though there might be a bit of a lip around the aperture that could make the effective thickness a bit bigger.

- Jan


#3

Right you are regarding my unit conversions. Whoops :blush: .