Key-shaped solder bumps and under bump metallurgy - Patent Review 6329608

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Key-shaped solder bumps and under bump metallurgy
United States Patent	6329608
Link to this page	http://www.wikipatents.com/6329608.html
Inventor(s)	Rinne; Glenn A. (Cary, NC), Mis; Joseph Daniel (Cary, NC)
Abstract	A flip-ship structure having a semiconductor substrate including an electronic device formed thereon, a contact pad on said semiconductor substrate electrically connected to said electronic device, a passivation layer on said semiconductor substrate and on said contact pad wherein said passivation layer defines a contact hole therein exposing a portion of said contact pad, an under-bump metallurgy structure on said passivation layer electrically contacting said portion of said contact pad that is exposed; and a solder structure on said under-bump metallurgy structure opposite said semiconductor substrate, said solder structure including an elongate portion on said elongate portion of said metallurgy structure opposite said contact pad and an enlarged width portion on said enlarged width portion of said metallurgy structure opposite said passivation layer.

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