Interconnection process for module assembly and rework
    7.
    发明授权
    Interconnection process for module assembly and rework 有权
    模块组装和返工的互连过程

    公开(公告)号:US06574859B2

    公开(公告)日:2003-06-10

    申请号:US09785787

    申请日:2001-02-16

    IPC分类号: H05K336

    摘要: An interconnection structure and methods for making and detaching the same are presented for column and ball grid array (CGA and BGA) structures by using a transient solder paste on the electronic module side of the interconnection that includes fine metal powder additives to increase the melting point of the solder bond. The metal powder additives change the composition of the solder bond such that the transient melting solder composition does not completely melt at temperatures below +230° C. and detach from the electronic module during subsequent ref lows. A Pb—Sn eutectic with a lower melting point is used on the opposite end of the interconnection structure. In the first method a transient melting solder paste is applied to the I/O pad of an electronic module by means of a screening mask. Interconnect structures are then bonded to the I/O pad. In a second method, solder preforms in a composition of the transient melting solder paste are wetted onto electronic module I/O pads and interconnect columns or balls are then bonded. Detachment of an electronic module from a circuit card can then be performed by heating the circuit card assembly to a temperature above the eutectic solder melting point, but below the transient solder joint melting point.

    摘要翻译: 通过使用包括细金属粉末添加剂的电子模块侧的瞬态焊膏来提供柱和球栅阵列(CGA和BGA)结构的互连结构及其分离方法,以增加熔点 的焊点。 金属粉末添加剂改变焊料接合的组成,使得瞬态熔融焊料组合物在低于+ 230℃的温度下不会完全熔化,并且在后续参考低温期间与电子模块分离。 在互连结构的另一端使用具有较低熔点的Pb-Sn共晶体。在第一种方法中,通过掩模掩模将瞬态熔融焊膏施加到电子模块的I / O焊盘。 然后将互连结构结合到I / O焊盘。在第二种方法中,将瞬态熔融焊膏的组成中的焊料预成型件润湿到电子模块I / O焊盘上,然后连接互连柱或焊球。连接电子 然后可以通过将电路卡组件加热到高于共熔焊料熔点但低于瞬态焊点熔点的温度来执行电路卡的模块。