A new Ni-W thin film metallization for solder interconnections and design method of metallization thickness

M. Harada, R. Satoh, O. Yamada, A. Yabushita, M. Itoh, T. Netsu, T. Terouchi
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引用次数: 3

Abstract

The demand for reliable thin-film metallization that can be repaired repeatedly by soldering has been increasing because multichip module on ceramic (MCM-C) has become widely used in workstations as well as main frame computers. This kind of metallization is also suitable for use with Pb-free solder with a high Sn content whereas a conventional metallization is consumed quickly by Sn. A Ni-W sputtered metallization satisfying this requirement has been developed by the authors. The reaction between Ni-W and Sn during soldering creates a Sn-Ni-W alloy layer. The diffusion of Sn into Ni-W and the formation of Sn-Ni-W is slower than any other thin-film metallization for solder interconnections ever applied to electronic devices, and this makes multiple solder repairs on a substrate possible. Furthermore, Ni-W is adequate for LSI metallization. Additionally, the film thickness appropriate to given amount of solder can be determined by adding the term for solder height to the frequency factor Do. This is especially important in designing fine connections for electronic devices.
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一种新型焊接互连用镍钨薄膜金属化及其金属化厚度的设计方法
随着陶瓷多芯片模块(MCM-C)在工作站和主机计算机中的广泛应用,对可通过焊接反复修复的可靠薄膜金属化的需求不断增加。这种金属化也适用于高锡含量的无铅焊料,而传统的金属化很快就会被锡消耗掉。作者开发了一种满足这一要求的Ni-W溅射金属化方法。在焊接过程中,Ni-W和Sn之间的反应形成了Sn-Ni-W合金层。Sn向Ni-W的扩散和Sn-Ni-W的形成比任何其他用于电子设备的焊料互连的薄膜金属化都要慢,这使得衬底上的多次焊料修复成为可能。此外,Ni-W适合大规模集成电路金属化。此外,适合于给定焊料量的薄膜厚度可以通过将焊料高度一项添加到频率因子Do来确定。这在设计电子设备的精细连接时尤为重要。
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