Patent ID: 7952198
Filing Date: 2011-05-31
Classification: H01L

Abstract:
1. A BGA package comprising: a leadframe having a plurality of leads, wherein each lead has a top surface and a bottom surface including a wire-bonding area and a ball-placement area, wherein each lead further has a lip projecting from the bottom surface around the ball-placement area; a first chip disposed on the top surfaces of the leads, the chip having an active surface and a plurality of first bonding pads on the active surface; a die-attaching layer adhering to the active surface of the chip and the top surfaces of the leads; a plurality of bonding wires connecting the first bonding pads of the first chip to the corresponding wire-bonding areas of the leads; an encapsulant encapsulating the first chip, the bonding wires, the die-attaching layer, and the top surfaces, and a plurality of laterals of the leads between the top surfaces and the bottom surfaces, wherein the ball-placement areas are embedded in the encapsulant, wherein a plurality of cavities are formed in a bottom of the encapsulant and aligned with the corresponding ball-placement areas so that the encapsulant further encapsulating the bottom surfaces of the leads except the ball-placement areas, wherein the lips have a plurality of internal sides exposed inside the cavities; and a plurality of solder balls disposed on the ball-placement areas and the internal sides of the lips to be partially embedded in the corresponding cavities.