Method of applying no-flow underfill
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United States of America Patent
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-
Jan 13, 2004
Issued Date -
N/A
app pub date -
Nov 16, 2001
filing date -
Nov 16, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A new method has been developed to provide underfill to chips mounted on substrates. First, an underfill is dispensed on the substrate. Second, the bumps of the chip are dipped in a flux that does not contain filler. Third, the chip that has been dipped in a tacky thermosettable flux is placed on the substrate, and fourth, the chip is soldered to the substrate, and simultaneously the underfill is cured. This process eliminates the interference on solder joints caused by the presence of filler in filled no-flow underfill. In addition, the fluxing property of the flux allows the use of underfills with emphasis on curing and mechanical properties instead of fluxing performance. Accordingly, a mounted device with reliable solder joints and underfill encapsulation is obtained.
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