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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
I need a a solder stencil for a upcoming PCB, and was wondering what material and thickness to use. The smallest pads are on a 127 QFN package, and are .3mm square. Because this is so small, I was thinking 2 mil (.002") thick. What material? I am thinking type 302 stainless steel.
Any thoughts? The stencil will be machined using FIB (Focused Ion Beam).
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Stainless steel would be the material of choice if you are going to be populating thousands of boards. Kapton is cheaper and works great as well as stands up to a hundred or so uses.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Why 302 stainless and not the (usually) more common 304 or 316?
Is this just because you happen to have some that is the correct thickness, or for some other reason?
EDIT: From Wikipedia
"If the sample is non-conductive, a low energy electron flood gun can be used to provide charge neutralization. In this manner, by imaging with positive secondary ions using the positive primary ion beam, even highly insulating samples may be imaged and milled without a conducting surface coating, as would be required in a SEM."
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Solder Stencil material and thickness
