Abstract:
A semiconductor package and a fabrication method thereof are provided in which a dielectric material layer formed with a plurality of openings is used and a solder material is applied into each of the openings. A first copper layer and a second copper layer are in turn deposited over the dielectric material layer and solder materials, and the first and second copper layers are patterned to form a plurality of conductive traces each of which has a terminal coated with a metal layer. A chip is mounted on the conductive traces and electrically connected to the terminals by bonding wires, with the dielectric material layer and solder materials being exposed to the outside. This package structure can flexibly arrange the conductive traces and effectively shorten the bonding wires, thereby improve trace routability and quality of electrical connection for the semiconductor package.
Abstract:
A ball grid array semiconductor package is proposed, wherein at least a chip is mounted on a substrate, and signal pads on the chip are electrically connected to signal fingers on the substrate by bonding wires. A power plate and a ground plate are each attached at two ends thereof respectively to predetermined positions on the chip and substrate, without interfering with the bonding wires. No power ring or ground ring is necessarily formed on the substrate, thereby reducing restriction on trace routability of the substrate. Further, with no provision of power wires or ground wires, short circuit of the bonding wires is less likely to occur, and thus production yield is enhanced. In addition, the power plate and ground plate provide shielding effect for protecting the chip against external electric-magnetic interference, and are partly in direct contact with the atmosphere for improving heat dissipating efficiency of the semiconductor package.
Abstract:
A method of fabricating BGA (Ball Grid Array) packages is proposed, which utilizes a specially-designed carrier to serve as an auxiliary tool to package semiconductor chips on substrates. The carrier is formed with a plurality of cavities respective for receiving a substrate and in communication with an injection gate, such that no injection gate is required on the substrate, thereby not restricting the trace routability on the substrate. Moreover, a two-piece type of mold is allowed being used to form a number of encapsulation bodies at one time, making the fabrication more productive and cost-effective. Furthermore, the proposed BGA fabrication method can be implemented without having to provide an air outlet in the substrate but allows the resulted encapsulation body to be free of voids to assure the quality of the packages. The proposed BGA fabrication method is therefore more advantageous to use than the prior art.
Abstract:
A printed circuit board and a method for fabricating the same is provided. A substrate having a core layer and a plurality of pairs of bond pads thereon is prepared with at least one opening formed on the core layer between each pair of the bond pads. A solder mask layer covers the core layer and fills the openings, with recessed portions formed at positions of the solder mask layer on the openings during curing of the solder mask layer. When a small passive component is mounted on the printed circuit board, a space is formed between the bottom of the passive component and the recessed portions of the solder mask layer. An encapsulating resin can flow into the space to form an insulating barrier between the bond pads to prevent bridging between the bond pads and short circuiting of the passive component.
Abstract:
A BGA (ball grid array) package with enhanced electrical and thermal performance, and a method for fabricating the BGA package, are proposed. This BGA package is characterized by the use of a power-connecting heat spreader and a ground-connecting heat spreader, which are respectively used to electrically connect power pad and ground pad to a packaged chip as well as to dissipate heat generated by the chip during operation. The ground-connecting heat spreader is arranged to entirely cover the chip, and thereby provides good shielding effect for the chip, which helps improve electrical performance of the chip during operation. Further, the ground-connecting heat spreader is partly exposed to outside of an encapsulation body that encapsulates the chip, by which satisfactory heat-dissipation efficiency can be achieved.
Abstract:
A BGA (ball grid array) package with enhanced electrical and thermal performance, and a method for fabricating the BGA package, are proposed. This BGA package is characterized by the use of a power-connecting heat spreader and a ground-connecting heat spreader, which are respectively used to electrically connect power pad and ground pad to a packaged chip as well as to dissipate heat generated by the chip during operation. The ground-connecting heat spreader is arranged to entirely cover the chip, and thereby provides good shielding effect for the chip, which helps improve electrical performance of the chip during operation. Further, the ground-connecting heat spreader is partly exposed to outside of an encapsulation body that encapsulates the chip, by which satisfactory heat-dissipation efficiency can be achieved.