Bump-on-lead flip chip interconnection
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United States of America Patent
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Mar 20, 2018
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N/A
app pub date -
Aug 13, 2013
filing date -
Nov 10, 2003
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Abstract
A semiconductor device has a semiconductor die with a plurality of bumps formed over the die. A substrate has a plurality of conductive traces formed on the substrate. Each trace has an interconnect site for mating to the bumps. The interconnect sites have parallel edges along a length of the conductive traces under the bumps from a plan view for increasing escape routing density. The bumps have a noncollapsible portion for attaching to a contact pad on the die and fusible portion for attaching to the interconnect site. [The fusible portion melts at a temperature which avoids damage to the substrate during reflow.] The noncollapsible portion includes lead solder, and fusible portion includes eutectic solder. The interconnect sites have a width which is less than 1.2 times a width of the conductive trace. Alternatively, the interconnect sites have a width which is less than one-half a diameter of the bump.
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