Abstract: An improved method of integrally attaching a heat sink to an IC package for enhancing the thermal conductivity of the package. A heat sink matrix, which is dividable into a plurality of individual heat sinks, is attached to an IC package matrix, which is comprised of a plurality of individual IC packages abutting each other in a matrix arrangement. The IC package matrix and the heat sink matrix attached thereto are then simultaneously cut by means of a machine tool into a plurality of individually formed IC packages each with a heat sink attached; thereby, thermal conductivity of a conventional IC package is enhanced.

Abstract: A structure of a heat spreader substrate. A first heat spreader has a first upper surface, a corresponding first lower surface and an opening. A second heat spreader has a second upper surface and a corresponding second lower surface. The second heat spreader is fit tightly into the opening. The second lower surface and the first lower surface are coplanar. A thickness of the second heat spreader is smaller than that of the first heat spreader. A chip is located on the second upper surface. A substrate is located on the first upper surface of the first heat spreader, and the opening is exposed by the substrate.

Abstract: An improved method of integrally attaching a heat sink to an IC package for enhancing the thermal conductivity of the package. A heat sink matrix, which is dividable into a plurality of individual heat sinks, is attached to an IC package matrix, which is comprised of a plurality of individual IC packages abutting each other in a matrix arrangement. The IC package matrix and the heat sink matrix attached thereto are then simultaneously cut by means of a machine tool into a plurality of individually formed IC packages each with a heat sink attached; thereby, thermal conductivity of a conventional IC package is enhanced.

Abstract: In a cavity down BGA packaging structure, a circuit substrate is bonded onto a heat spreader. A cavity formed is formed in the circuit substrate into which a chip is bonded onto the heat spreader. The circuit substrate has at least an insulating layer, a patterned wiring layer, and a via electrically connected to the heat spreader. A first ground pad, ball pad, and first contact pad are defined on the patterned wiring layer, wherein the first ground pad is spaced apart from and electrically connected to the via. The chip comprises at least a second contact pad and a second ground pad respectively connected to the first contact pad and the heat spreader. An encapsulant material encapsulates the cavity, the chip, and the first and second contact pads. A plurality of solder balls are attached to the first ground pad and ball pad.

Abstract: A heat-spread substrate consisting of a metal heat spreader and a substrate is disclosed. The metal heat spreader has a surface with a cavity, which is adapted for supporting a die. Such surface further includes a ground ring arranged at the periphery of the cavity; a substrate-supporting surface surrounding the periphery of the ground ring; a plurality of first ground pads arranged at the periphery of the substrate-supporting surface; and a plurality of second ground pads arranged on the substrate-supporting surface and protruding it. The substrate is provided on the substrate-supporting surface having a plurality of through holes. The through holes corresponds to the first ground pad so as to make it be located therein, respectively. The substrate further includes a plurality of mounting pads and a plurality of ball pads, in which the mounting pads are close to the cavity, and the first ground pad, the second ground pads and the ball pads are formed in the form of ball grid array and are coplanar roughly.

Abstract: A laser method for forming vias comprises: providing a heat sink; locally oxidizing a surface of the heat sink into a copper oxide film; bonding a substrate onto the heat sink at the copper oxide layer locations, wherein the substrate comprises at least a patterned trace layer and an insulating layer to which is bonded the heat sink, the insulating layer comprising a plurality of through holes that expose the portions of the copper oxide film; removing the copper oxide exposed through the through holes by laser beam; disposing a plurality of solder balls respectively in the through holes; and reflowing the solder balls to form a plurality of vias.

Abstract: A structure of a heat spreader substrate. A first heat spreader has a first upper surface, a corresponding first lower surface and an opening. A second heat spreader has a second upper surface and a corresponding second lower surface. The second heat spreader is fit tightly into the opening. The second lower surface and the first lower surface are coplanar. A thickness of the second heat spreader is smaller than that of the first heat spreader. A chip is located on the second upper surface. A substrate is located on the first upper surface of the first heat spreader, and the opening is exposed by the substrate.