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上面两个内容涉及两种BGA的焊接方式,collapsing和non-collapsing，collapsing对应的焊盘比引脚球要小，焊接时引脚球塌陷包围住焊盘，而non-collapsing 对应的焊盘比引脚球要大，焊接时引脚球不塌陷。 大部分BGA的焊球直径以0.05mm为增量;BGA引脚间距以0.05mm为增量，50mil（1 ...

Two years ago, Rupert Murdoch’s daughter ,Elisabeth ,spoke of the “unsettling dearth of integrity across so many of our institutions” Integrity had collapsed, she argued, because of a collective ...