Patent ID: 7274088

Claim:
A flip-chip semiconductor package, comprising: a lead frame having a plurality of leads, each of the leads being formed with an inner end directed toward the center of the lead frame, wherein a dam member is provided at a predetermined position on each of the leads, so as to form a bonding area between the dam member and the inner end of the corresponding one of the leads; at least a chip implanted with a plurality of solder bumps and mounted on the lead frame in a manner that the solder bumps are reflow-soldered to the bonding areas of the leads, the bonding areas being completely wetted and filled by the solder bumps, so as to allow the chip to be electrically connected to the leads by the solder bumps, wherein the dam members are interposed between the chip and the leads, and the dam members have a predetermined height corresponding to a collapsed height of the reflow-soldered solder bumps; and an encapsulant for completely encapsulating the chip and the solder bumps, and partially encapsulating the leads, wherein the chip abuts against the dam members such that the reflow-soldered solder bumps collapse to the bonding areas without over-collapsing or over-wetting outside the bonding areas.