If contact area is critical to the function of the device, the solder mask-covered areas obviously do not have the opportunity to make contact with the solder, and the design calculations should reflect the limitation of the masked areas to conduct heat or electricity, in addition to anticipating a certain amount of voids in the solderable areas.
BTC center pad divided by solder mask to limit void size. Additionally, if the pads contain thermal vias, voiding can be mitigated by not applying solder mask or solder paste over the vias. Solder paste selection.
Solder paste formulations balance a large number of characteristics, including reliability, wetting, pin-testability, printability, shelf life, cleanability and reflow properties. Balancing all these considerations will have an impact on paste voiding characteristics. Selecting a solder paste formulated to mitigate voids in the reflow process will result in smaller and fewer voids not only under BTCs but in BGAs and other components as well.
Solder paste consists of two components: flux medium and solder powder.
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The role of medium on solder void formation can be manipulated using various techniques, including solvent selection and activator systems. We set out to determine if size and distribution of the spheres in the solder powder would have any impact on BTC void formation. If we could correlate powder distribution to void reduction, we would be able to offer another tool to the assembler toward void reduction. Unfortunately, the initial test results do not indicate a strong correlation between voiding and particle size distribution; however, the research continues to explore the relationship in greater depth.
Stencil design. We recently completed a series of designed experiments on void generation using the AIM standard test vehicle, which contains a variety of BTC footprints. Users wishing to use this board in their own tests can go to Practical Components. We found that voiding is not as dependent on paste coverage area percentage as it is on the design of the apertures.
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Our data indicate designs that created outgassing paths for flux volatiles outperformed designs that did not. ACS Omega , 5 35 , Langmuir , 36 33 , ACS Omega , 5 29 , Weidler, Philip Scharfer, Wilhelm Schabel. Langmuir , 36 22 , Yavuz, Yoon Sung Nam. ACS Omega , 5 16 , ACS Catalysis , 10 4 , ACS Omega , 4 26 , Vlasenko, Pavlo I. Kyriienko, Karina V. Valihura, Gulnara R. Kosmambetova, Sergii O. Soloviev, Peter E. ACS Omega , 4 25 , Barbosa, Leonardo Travalloni, Frederico W. Tavares, Marcelo Castier. The Journal of Physical Chemistry C , 27 , Bates, Brandon C. Bukowski, James W. Harris, Jeffrey Greeley, Rajamani Gounder.
ACS Catalysis , 9 7 , Mattern, Nosa O. Egiebor, Nathan Hammer, Vijayasankar Raman. Boldrini, Sabrina Angeletti, Patricia M. Cervellini, Deborath M. Langmuir , 35 2 , Taylor, Jeffrey R. Journal of the American Chemical Society , 46 , Structural and Gas-Sorption Effects. Chemistry of Materials , 30 19 , Choulis, Stella Kennou, Gerasimos S.
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