摘要:
A method and apparatus are provided for selectively depositing flux on a plurality of flip-chip bumps arranged on a semiconductor by mounting a flux stamp on the semiconductor chip. The flux stamp has a plurality of flux holes arranged in a pattern substantially identically corresponding to the arrangement of the flip-chip bumps of the semiconductor chip. Different flux stamps are prepared for various kinds of semiconductor chips having different flip-chip bump arrangements. Flux is deposited though the flux holes of the flux stamp which selectively exposing the upper surfaces of the flip-chip bumps of the chip, thereby leaving no flux on the chip surface between the flip-chip bumps.
摘要:
A package assembly is formed by applying flux to a substrate and inspecting the applied flux to determine whether the amount applied is adequate to form reliable interconnections between a device and the substrate. Embodiments include applying a rosin based flux on a laminate substrate and inspecting the coverage of the applied flux by fluorescent spectroscopy.
摘要:
A method of cleaning residue on surfaces in a reflow furnace includes introducing a solvent into the furnace chamber; reacting the solvent with the residue to form a product; and, removing the product from the furnace chamber. The solvent is gaseous, such as an etch gas. Also, the product of the reaction between the residue and the solvent can is gaseous. The gaseous product can then be exhausted from the reflow furnace. A reflow furnace for practicing the method is also disclosed.
摘要:
A carrier member is provided that has a plurality of landing pads thereon where at least one of the landing pads has a depression therein to hold at least one solder terminal of a device to be mounted thereto. Embodiments include a ceramic or a bismaleimide-triazine epoxy laminate carrier having an array of landing pads formed by depositing a eutectic solder, where each landing pad in the comer of the array has a depression therein.
摘要:
This invention is directed to controlling the amount of flux dispensed onto the surface of an IC component. The component is continually weighed and data is fed back to a controller that controls the dispensing of flux onto the IC component. When the proper amount of flux is dispensed, the controller terminates the dispensing of the flux.