Patent ID: 7122407
Filing Date: 2006-10-17
Classification: H01L

Abstract:
1. A method for fabricating a window ball grid array (WBGA) semiconductor package, comprising the steps of: preparing a substrate plate integrally formed of a plurality of substrates each of which has an upper surface and an opposite lower surface and has an opening formed through the same, wherein at least one array of ball pads are formed on the lower surface of each of the substrate around the opening and spaced apart from the edge of the opening; mounting at least one chip on the upper surface and over the opening of each of the substrates via an adhesive, with gaps, not applied with the adhesive, being formed between the chips and the corresponding substrates; forming a plurality of bonding wires through the opening of each of the substrates for electrically connecting the chip to the lower surface of the corresponding substrate; preparing a spacer having an upper surface and an opposite lower surface and having a plurality of through holes through the same, with a recessed portion formed on the upper surface of the spacer around each of the through holes; and attaching the upper surface of the spacer to the lower surfaces of the substrates, wherein each of the through holes corresponds to and is larger than the opening of each of the substrate, and the recessed portion is located between the array of ball pads and the edge of the opening, and wherein the spacer has a thickness larger than a height of wire loops of the bonding wires protruding from the lower surfaces of the substrates so as to allow the bonding wires bonded to each of the chips to be received in the corresponding through hole of the spacer and the opening of the corresponding substrate; performing a molding process which uses an upper mold having a cavity and a lower mold to form an encapsulation body by a resin material on the upper and lower surfaces of the substrates, wherein the upper mold is mounted on the upper surfaces of the substrates with the chips received in the cavity, and the lower mold is attached to the lower surface of the spacer with the spacer disposed between the substrates and the lower mold, so as to allow the resin material to fill the cavity for encapsulating the chips and flow through the gaps between the chips and the corresponding substrates for filling the openings of the substrates, the through holes of the spacer and the gaps and encapsulating the bonding wires; removing the upper and lower molds and the spacer from the substrates; bonding a plurality of solder balls to the ball pads on the lower surface of each of the substrates; and cutting part of the encapsulation body formed on the upper surfaces of the substrates and the substrate plate to separate apart the integrally formed substrates and form a plurality of individual semiconductor packages each having a singulated substrate.