Patent ID: 6469897
Filing Date: 2002-10-22
Classification: H01L,Y10T

Abstract:
A method for fabricating a TBGA package, comprising the steps of:(1) preparing a heat sink, a tape, and a semiconductor chip; wherein the tape is predefined with an array of solder-ball pads including at least one grounding solder-ball pad; the heat sink is predefined with a chip-mounting cavity; and the semiconductor chip includes at least one grounding pad; (2) forming a via hole in the heat sink at a predefined location aligned to the grounding solder-ball pad; (3) forming a via hole in the tape at a predefined location aligned to the heat-sink via hole and the grounding solder-ball pad without penetrating the grounding solder-ball pad; (4) attaching the tape to the heat sink, with the tape via hole being joined to the heat-sink via hole; (5) filling an electrically-conductive material into the heat-sink via hole until substantially filling up the tape via hole and the heat-sink via hole to thereby form a grounding plug serving to electrically connect the heat sink to the grounding solder-ball pad; (6) mounting the semiconductor chip in the chip-mounting cavity of the heat sink, with the grounding pad of the semiconductor chip being electrically bonded to the heat sink and thereby being electrically connected via the grounding plug to the grounding solder-ball pad; and (7) forming a ball grid array on the array of solder-ball pads on the tape, the ball grid array including at least one grounding solder ball attached to the grounding solder-ball pad to serve as an external grounding point for the semiconductor chip.