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Thick Al Ribbon Interconnects: A Feasible Solution for Power Devices Packaging

机译:厚铝带状互连:功率器件封装的可行解决方案

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摘要

With the constant drive for smaller, more cost effective power electronic systems offering enhanced performance and reliability, Aluminium (Al) ribbon bonding has become an attractive alternative to the well established thick Al wire bonding. Improved electrical performance and assembly cost reduction are the main expected benefits. Although ribbon bonding is viewed as a drop-in replacement for wire bonding, differences in the details of the joining process are to be expected. The potential effects of those differences on the bond formation and ultimately the bond reliability warrant a more detailed investigation. This work covers a first step, in which we analyze and report the effects of different target bond deformation levels on the strength and reliability of 80 × 8 mil thick Al ribbon bonded with different bond tools. The long-term strength and reliability of these ribbon bonds were assessed under thermal cycling between -60℃ to 170℃. Bond shear testing was used to characterize bond strength. Micro-structural analysis was performed and the correlation between measured bond shear strength and crack length along the bond interface at increasing numbers of thermal cycles was studied. In summary, both the bond tool type and deformation setting play an important role in determining the thermal cycling reliability of the ribbon bond.
机译:由于不断驱动着体积更小,更具成本效益的电力电子系统,从而提供了更高的性能和可靠性,铝(Al)碳带键合已成为完善的粗铝线键合的一种有吸引力的替代方法。改进的电气性能和降低的装配成本是主要的预期收益。尽管带状键合被视为引线键合的替代品,但在接合过程的细节上仍存在差异。这些差异对债券形成以及最终债券可靠性的潜在影响值得进一步研究。这项工作涵盖了第一步,我们分析并报告了不同目标粘结变形水平对使用不同粘结工具粘结的80×8 mil厚铝带的强度和可靠性的影响。这些带状键的长期强度和可靠性在-60℃至170℃的热循环下进行了评估。粘结剪切测试用于表征粘结强度。进行了微观结构分析,并研究了随着热循环次数的增加,沿粘结界面的实测粘结剪切强度与裂纹长度之间的相关性。总而言之,键合工具的类型和变形设置在确定带式键合的热循环可靠性方面都起着重要作用。

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