Patent ID: 7170168

Claim:
A flip-chip semiconductor package with a lead frame, comprising: the lead frame, which has a plurality of leads, each of the leads having an upper surface, a lower surface and an inner end directed toward the center of the lead frame, wherein a first recessed portion is formed on the upper surface of the inner end of each of the leads, making the inner end shaped as a stepped structure, and the first recessed portion has a depth equal to a height of a collapsed solder bump that is for electrically connecting at least one chip to the lead; the at least one chip, which has an active surface and a non-active surface, wherein the active surface is electrically connected to the leads via a plurality of the solder bumps that are bonded to the first recessed portions respectively, and peripheral areas of the active surface of the chip are in contact with areas on the upper surfaces of at least three of the leads free of having the first recessed portions; and an encapsulation body for encapsulating the lead frame, the chip and the solder bumps, with the lower surfaces of the leads being exposed from the encapsulation body.