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IMPROVEMENT OF THE JOINT RELIABILITY BETWEEN SN-3.5AG SOLDER AND NI-P UNDER BUMP METALLIZATION BY CO ADDITION
IMPROVEMENT OF THE JOINT RELIABILITY BETWEEN SN-3.5AG SOLDER AND NI-P UNDER BUMP METALLIZATION BY CO ADDITION
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机译:共添加凹凸金属化对提高SN-3.5AG焊料与Ni-P焊接可靠性的影响
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摘要
A solder joint structure in which the junction reliability between Sn-3.5Ag solder and Ni-P under bump metallization by co addition is improved is provided to suppress the additional chemical reaction between the solid bottom metal layer and the liquid solder. A solder joint structure has a structure that the Ni-P bottom metal layer is welded into the Sn-3.5Ag-xCo alloy solder in which the cobalt is added. In the alloy solder, the cobalt includes to 0.02~0.1wt% range. The junction of the Ni-P bottom metal layer and the alloy solder(Sn-3.5Ag-xCo) adding the cobalt are connected between the PCB substrate and the silicon chip. The solder junction is connected between the silicon chip and silicon chip. The Ni3Sn4 is formed on the interface of the Ni-P metal layer and the Sn-3.5Ag alloy solder adding Co in order to improve the junction reliability.
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