INVESTIGATION AND DEVELOPMENT OF TIN-LEAD AND LEAD-FREE SOLDER PASTES TO REDUCE THE HEAD-IN-PILLOW COMPONENT SOLDERING DEFECTAuthors: Jasbir Bath and Roberto Garcia, et al.
Company: Christopher Associates Inc. and Koki Solder
Date Published: 10/4/2009 Conference: SMTA International
In order to reduce this affect work was done on a set of tin-lead and lead-free solder pastes which were developed with flux formulations in the solder paste having higher heat resistance which did not lose their flux activation properties as quickly and quicker wetting which helped to reduce the head-in-pillow defect. The results of the evaluation are presented with test methods to analyze the head in pillow defect not only on BGA component test vehicles but also more fundamental studies to assess BGA/CSP solder ball interactions with the developed versus control solder pastes. As well as reviewing some of the other causes of the Head-in-Pillow defect such as printed solder paste volume, component placement and reflow profile used, an assessment will be done on the industry standards which need to be updated or developed for component and board co-planarity in the as-received and reflowed conditions.
Key words: Lead-free, Tin-lead, Head-in-Pillow, Warpage
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