Reliability evaluations of under bump metallurgy in two solder systems

Under bump metallurgy (UBM) reliability is one of the critical issues in the total reliability of a flip-chip bumping technology. Since the UBM materials and structures vary for different bumping technologies, the UBM strength and reliability need to be determined for each design and process. In add...

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Veröffentlicht in:IEEE transactions on components and packaging technologies 2001-12, Vol.24 (4), p.655-660
Hauptverfasser: Guo, W., Kuo, S.M., Zhang, C.
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container_title IEEE transactions on components and packaging technologies
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creator Guo, W.
Kuo, S.M.
Zhang, C.
description Under bump metallurgy (UBM) reliability is one of the critical issues in the total reliability of a flip-chip bumping technology. Since the UBM materials and structures vary for different bumping technologies, the UBM strength and reliability need to be determined for each design and process. In addition, the stress that a UBM experiences during thermal cycles depends on the solder alloy used in the interconnect. Different solder alloys require different UBM structures and strengths to achieve good reliability in thermal cycling. In this study, a simplified stress model is developed to determine the UBM stress during thermal cycling. A simplified stress model for the UBM strength is also developed. These models are used to predict the stress and strength of the UBM under the die pull test and the thermal cycle conditions for both eutectic and high lead solder systems. A methodology for using the pull test results to evaluate UBM reliability is also discussed. This methodology can be extended to the studies of UBM's with other solder systems such as lead free solder systems.
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Since the UBM materials and structures vary for different bumping technologies, the UBM strength and reliability need to be determined for each design and process. In addition, the stress that a UBM experiences during thermal cycles depends on the solder alloy used in the interconnect. Different solder alloys require different UBM structures and strengths to achieve good reliability in thermal cycling. In this study, a simplified stress model is developed to determine the UBM stress during thermal cycling. A simplified stress model for the UBM strength is also developed. These models are used to predict the stress and strength of the UBM under the die pull test and the thermal cycle conditions for both eutectic and high lead solder systems. A methodology for using the pull test results to evaluate UBM reliability is also discussed. This methodology can be extended to the studies of UBM's with other solder systems such as lead free solder systems.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/6144.974957</doi><tpages>6</tpages></addata></record>
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subjects Alloying additive
Design engineering
Environmentally friendly manufacturing techniques
Lead
Materials reliability
Mathematical models
Metallurgy
Methodology
Packaging
Predictive models
Process design
Soldering
Solders
Strength
Stresses
System testing
Tensile stress
Thermal cycling
Thermal stresses
title Reliability evaluations of under bump metallurgy in two solder systems
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