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Environmental and health concerns have resulted in significant activities to find substitutes for lead-contained solders for microelectronics. The potential candidates such as Sn-Ag1 and Sn-Ag-Cu1 eutectic solders with melting temperatures of 221?C and 217?C, respectively are the most prominent solders because of their excellent mechanical properties as compared with that of eutectic Sn-Pb solder2...
RoHS Directive for environmental and health concerns have resulted in significant activities to find substitutes for lead-contained solders for microelectronics. The potential candidates such as Sn-Ag1 and Sn-Ag-Cu1 eutectic solders with melting temperatures of 221degC and 217degC, respectively are the most prominent solders because of their excellent mechanical properties as compared with that of...
A comparison study between Sn3.5Ag solder ball and conventional Sn3.8AgO.7Cu (SAC387) solder ball was conducted on 33??33 FCPBGA with SOP pad finishing. After assembly, samples were subjected to laser scanning for slanted ball inspection. Visual inspection under low power scope was done to check for wrinkled balls. Cold ball pull (CBP) was used to evaluate the solder joint strength at 4 conditions,...
The purpose of this paper is to discuss the effect of Nickel (Ni) thickness on lead free solder joint material for tape ball grid array (TBGA) application. In this study, four different level of Nickel thickness were chose that is 3 um, 4 um, 5 um and 6 um. Ball pull testing was used to assess the solder joint performance at time zero, after multiple reflow and high temperature storage (HTS). The...
As the world is changing to Pb-free solder per EU ROHS Directive, the higher reflow temperature requirement for Pb- free solder has demanded better substrate metal trace to solder mask adhesion to prevent delamination problem. Hence, selective Ni/Au plating process becomes more appealing in the fabrication of substrates to support Pb-free Semiconductor BGA product packaging. However, the set back...
This paper characterizes the effect of various Sn-Ag-Cu solder compositions towards shear strength and melting behavior. Shear strength is measured by Dage which is representative of the inter-metallic compound (IMC) strength between the solder and solder clad of a C5 bump. Further study on melting properties will be obtained by Differential Scanning Calorimetry (DSC). It was found that lwt%Ag 0.5wt%...
Solder joining is one of the interconnection methods in microelectronic packaging. The robustness of the solder ball attachment to the packages determines the solder joint strength between solders and the under-bump metallization (UBM). This paper discussed the solder joint shear strength between Sn/4.0/0.5Cu with containing 20-50 ppm phosporus and Sn/3.8Ag/0.7Cu deposited onto selective plating Ni/Au...
This paper study Sn-Ag-Cu solder alloy compositions towards mechanical, surface elemental and thermal properties. Mechanical properties were evaluated by shear strength, while the solder surface oxide depth profile and melting properties were obtained by Auger and differential scanning calorimetry (DSC) respectively. Overall results indicates that Sn3.8AgO.7Cu having the most favorable results with...
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