by Richard Brooks, John Carr, Marty Carr
New assembly technologies are being considered for
production to reduce size and/or increase functionality.
These new technologies include: 0201 & 01005 chip
components and 0.4 mm & 0.3 mm pitch CSP devices. In
order to implement these new technologies, some major
changes in the manufacturing process may have to be
addressed. First, the solder paste must provide the ability to print very small apertures, such as 0.008” (0.2mm) & below and with consistent paste release from the stencil. Therefore, one of the possible solutions may be to change the standard solder powder size, which is type 3 powder. Also, because we are printing very small aperture openings, we need to consider changes in the stencil technology. Some of those changes are the stencil type (laser versus electroformed) and the stencil thickness. Additionally, because we are attempting to print very small apertures, the printing process must be in control and characterized. This paper will review the new technology requirements and how they will affect the performance of the solder paste and stencil technology in the manufacturing process, as well as the printing process.
solder paste, process characterization, solder powder, pad design, stencil design, stencil technology, fine pitch printing
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Posted on 8 Mar 2010
