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Flip Chip is the one of technology in Assembly, unlike the traditional Assembly, Flip chip connect the signal between die and substrate by using the bump on the die side instead of connect the signal between die and substrate by using wire. Plasma is an electrically neutral medium of unbound positive and negative particles and is one of the four fundamental states of matter, plasma with strong coupling effect with the electromagnetic field since it has high electrical conductivity. Plamsa is a partially ionized gas consisting of electrons, ions, free radicals, neutral particles and photons. The plasma process can complete the surface modification of the material, including surface activation, pollutant removal, etching and other effects after physical bombardment and chemical reaction. Keywords:Non-Clean Flux , Underfill , Reliability Analysi
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