Process of reworking pin grid array chip carriers
    8.
    发明授权
    Process of reworking pin grid array chip carriers 失效
    引脚网格阵列芯片载体的返工过程

    公开(公告)号:US06203690B1

    公开(公告)日:2001-03-20

    申请号:US09163148

    申请日:1998-09-29

    IPC分类号: C25F300

    摘要: A process for reworking of PGA chip carriers where one or more I/O pins is unplated. The process includes electrolytically etching the I/O pins which removes any corrosion product from the unplated I/O pins and removes the top gold layer from the remaining I/O pins. The etchant includes a metal-providing compound selected from the group consisting of a silver salt, copper cyanide, silver cyanide, gold cyanide or mixtures thereof, at a concentration in the range from about 2.7 to about 4.1 g/l as metal; potassium or sodium carbonate at a concentration in the range from about 10 to about 100 g/l; and potassium or sodium cyanide at a concentration in the range from about 29 to about 35 g/l.

    摘要翻译: 一种用于重新编码一个或多个I / O引脚未被放置的PGA芯片载体的过程。 该过程包括对I / O引脚进行电解蚀刻,从而从未镀覆的I / O引脚中除去任何腐蚀产物,并从剩余的I / O引脚中除去顶部金层。 蚀刻剂包括浓度为约2.7至约4.1g / l的金属的选自银盐,氰化铜,氰化银,氰化金或其混合物的金属提供化合物; 浓度在约10至约100g / l范围内的碳酸钾或碳酸钠; 和浓度在约29至约35g / l范围内的氰化钾或氰化钠。