摘要:
A manufacturing method for Flip Chip on Chip (FCoC) package based on multi-row Quad Flat No-lead (QFN) package is provided wherein the lower surface of plate metallic base material are half-etched to form grooves. Insulation filling material is filled in the half-etched grooves. The upper surface of plate metallic base material is half-etched to form chip pad and multi-row of leads. Encapsulating first IC chip, second IC chip, solder bumps, underfill material, and metal wire to form an array of FCoC package based on the type of multi-row QFN package. Sawing and separating the FCoC package array, and forming FCoC package unit.
摘要:
A method of maintaining photolithographic precision alignment for a wafer after being bonded, wherein two cavities are formed at the rear surface of a top wafer at the position corresponding to alignment marks made on a bottom wafer. The depth of both cavities is deeper than that of a final membrane structure. The top wafer is then bonded to the bottom wafer which already has alignment marks and a microstructure. This bonded wafer is annealed to intensify its bonding strength. After that, a thinning process is applied until the thickness of the top wafer is reduced to thinner than the cavity depth such that the alignment marks are emerged in the top wafer cavities thereby serving as alignment marks for any exposure equipment.
摘要:
A manufacturing method for Package in Package (PiP) electronic device based on multi-row Quad Flat No-lead (QFN) package is provided wherein the lower surface of plate metallic base material are half-etched to form grooves. Insulation filling material is filled in the half-etched grooves. The upper surface of plate metallic base material is half-etched to form chip pad and multi-row of leads. Encapsulating IC chip for wire bonding, adhesive material, metal wire, chip pad and a plurality of leads to form a multi-row QFN package as an inner package. Flip-chip bonding IC chip with solder bumps on the first metal material layer of leads. Encapsulating IC chip with solder bumps, the multi-row QFN package, adhesive material, and leads to form an array of PiP electronic devices. Sawing and separating the PiP electronic device array, forming PiP electronic device unit.
摘要:
A method of maintaining photolithographic precision alignment for a wafer after being bonded, wherein two cavities are formed at the rear surface of a top wafer at the position corresponding to alignment marks made on a bottom wafer. The depth of both cavities is deeper than that of a final membrane structure. The top wafer is then bonded to the bottom wafer which already has alignment marks and a microstructure. This bonded wafer is annealed to intensify its bonding strength. After that, a thinning process is applied until the thickness of the top wafer is reduced to thinner than the cavity depth such that the alignment marks are emerged in the top wafer cavities thereby serving as alignment marks for any exposure equipment.