Ball grid array semiconductor package with solder balls fused on printed circuit board and method for fabricating the same
First Claim
1. A method of fabricating a ball grid array semiconductor package comprising:
- forming a flexible circuit board from a thin, flexible film, the circuit board having an upper surface, a lower surface, a circuit pattern formed on the upper surface, a plurality of solder ball lands disposed on the lower surface, and a plurality of apertures extending through the film between the circuit pattern and the solder ball lands;
forming a carrier frame comprising an outer support plate having a window therein;
bonding the carrier frame to the upper surface of the flexible circuit board such that the circuit pattern is framed within the window of the outer support plate, and such that the outer support plate supports and stiffens the flexible circuit board;
bonding a semiconductor chip to the flexible circuit board inside the window of the outer support plate using adhesive means;
wire-bonding the semiconductor chip to the circuit pattern of the flexible circuit board by conductive wires;
encapsulating the semiconductor chip and the conductive wires with an encapsulant to protect them from the environment; and
fusing a plurality of solder balls to the solder ball lands on the lower surface of the flexible circuit board such that the solder balls connect through the apertures to the circuit pattern on the upper surface thereof and function as input/output means for the package.
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Accused Products
Abstract
A ball grid array semiconductor package using a flexible circuit board, in which the flexible circuit board has no conductive via hole nor solder mask while having a thin structure formed at only one surface thereof with a circuit pattern having a small length. The flexible circuit board is mounted with a metallic carrier frame to achieve an easy handling thereof, a reduction in the inductance, impedance and coupling effect of adjacent circuit patterns and an easy discharge of heat from a semiconductor chip, thereby achieving an improvement in electrical performance and an improvement in heat discharge performance. The metallic carrier frame has a plurality of openings adapted to increase the bonding force between an encapsulate and constituting elements of the package, thereby removing a bending phenomenon of the package, and a method for fabricating such a BGA semiconductor package. The invention also provides a method for fabricating such a BGA semiconductor package.
114 Citations
20 Claims
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1. A method of fabricating a ball grid array semiconductor package comprising:
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forming a flexible circuit board from a thin, flexible film, the circuit board having an upper surface, a lower surface, a circuit pattern formed on the upper surface, a plurality of solder ball lands disposed on the lower surface, and a plurality of apertures extending through the film between the circuit pattern and the solder ball lands; forming a carrier frame comprising an outer support plate having a window therein; bonding the carrier frame to the upper surface of the flexible circuit board such that the circuit pattern is framed within the window of the outer support plate, and such that the outer support plate supports and stiffens the flexible circuit board; bonding a semiconductor chip to the flexible circuit board inside the window of the outer support plate using adhesive means; wire-bonding the semiconductor chip to the circuit pattern of the flexible circuit board by conductive wires; encapsulating the semiconductor chip and the conductive wires with an encapsulant to protect them from the environment; and fusing a plurality of solder balls to the solder ball lands on the lower surface of the flexible circuit board such that the solder balls connect through the apertures to the circuit pattern on the upper surface thereof and function as input/output means for the package. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification