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The influence of the standoff height, pad size and isothermal aging on the microstructure and shear fracture behavior of Cu/Sn-3.0Ag-0.5Cu/Cu BGA structured interconnects were investigated using the lap-shear test. The experimental results show that the thickness of intermetallic compounds (IMC) layer at the solder/Cu interface increases with decreasing standoff height of the joints. The size of Kirkendall...
In the present study, the interaction between thin film Cu and non-eutectic Sn-In is studied. The effects of the bonding and aging temperature on microstructure, IMC formation and also shear strength are investigated by SEM/EDX, XRD and shear testing. The bonding mechanism is proposed based on the obtained results. The bonding mechanism is proposed to occur over 2 stages: (1) An increase in bonding...
A study was conducted on BGA lead-free C5 solder joint system to compare SnAgNiCo versus conventional Sn3.8Ag0.7Cu solder alloy. This study showed that SnAgNiCo C5 solder system performed better than Sn3.8Ag0.7Cu in terms of joint strength and brittle mode failure. Shear and pull strength was measured by Dage which is representative of the intermetallic (IMC) strength between the C5 solder sphere...
Considering that the mechanical behavior plays a very important role in the packaging reliability, this study examined the shear deformation properties of pure Sn joints with different substrate materials and various gap sizes. The proeutectic Sn dendrites were refined and the shear strength was increased with a shrunken sample gap. The interfacial intermetallic compounds (IMCs) were thickened slightly...
To meet the urgent demands of future electronic packages, the solder joints have to become increasingly miniaturized. Compared to the large solder joints, mechanics behavior for the samll solder joints is very different, resulting in a series of reliability issues. Therefore, it is very important to understand the mechanics behavior of the small solder joints. In this paper, the shear test of the...
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