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Effect of Isothermal Aging on Ball Shear Strength in BGA Joints with Sn 3 5Ag 0 75Cu Solder

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Figure

Fig. 1SEM micrographs of the interface between Sn–3.5Ag–0.75Cu solder and Cu pad (a)–(c), Sn–3.5Ag–0.75Cu solder and immersionAu/Ni–P/Cu pad (d)-(f): as-soldered (a), (d) and after aging at 150◦C for 30 days (b), (e) and 100 days (c), (f).
Fig. 2Variations of the ball shear strength with aging time and tem-perature: (a) Cu pad, (b) electroless Ni–P/Cu pad and (c) immersionAu/Ni–P/Cu pad.
Fig. 3Fracture surface after ball shear test for solder/Cu pad joint (a), (b), solder/electroless Ni–P/Cu pad joint (c), (d), and immersionAu/Ni–P/Cu joint (e), (f): as-soldered (a), (c), and (e) and after aging at 150◦C for 100 days (b), (d), and (f).
Fig. 5Backscattered electron micrograph of the interface betweenSn–3.5Ag–0.75Cu solder and immersion Au/Ni–P/Cu pad after agingat 150◦C for 100 days, and EDX analyses of points shown in micro-graph

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