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학술지 Characterization and Estimation of Solder-on-Pad Process for Fine-Pitch Applications
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저자
이학선, 엄용성, 배현철, 최광성, 이진호
발행일
201410
출처
IEEE Transactions on Components, Packaging, and Manufacturing Technology, v.4 no.10, pp.1729-1738
ISSN
2156-3950
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TCPMT.2014.2354049
협약과제
14ZB1400, ESSOP CUBE 기술 기반 차세대 레이더 3D 모듈 개발, 이진호
초록
Popular solder-bumping mechanisms such as electroplating and stencil printing suffer from either high process costs or technical limitations. A low-cost solder-on-pad (SoP) process has been developed to meet the requirements of fine-pitch solder bumping. This paper focuses on the characterization and estimation of the SoP process. To form a solder bump without soldering defects, optimum process conditions should be carefully designed. A model to estimate the bump volume and predict the bump height is suggested. By optimizing the composition of solder paste material called solder-bump-maker, and by adjusting the process conditions, Sn-Ag-Cu solder bumps with different heights are obtained. The experiments and analysis to understand the impact of parameters were based on test vehicles with 80 μm pitch size. Then, the measured heights of solder bumps are compared with the model to see how they fit the estimation. Finally, a similar process has been conducted to test vehicles with pitch sizes of 150 and 40 μm, to confirm the scalability of the SoP process in different pitch sizes.
키워드
Bumping, solder-on-pad (SoP), stencil printing
KSP 제안 키워드
Fine pitch, Low-cost, Process conditions, Sn-Ag-Cu solder, Solder bumping, Solder paste, Stencil printing