Patent ID: 7662672

Claim:
A manufacturing process of a leadframe-based BGA package, comprising the steps of: providing a leadless leadframe with an upper layer and a lower layer, wherein the upper layer includes a plurality of ball pads and the lower layer includes a plurality of leads and a plurality of sacrificial pads, the sacrificial pads align and connect with the ball pads and are interconnected by the leads; attaching at least a chip onto the upper layer of the leadless leadframe; electrically connecting the chip to the ball pads of the leadless leadframe; encapsulating the leadless leadframe so that the ball pads are embedded inside the encapsulant and the bottom surfaces of the leads and the sacrificial pads are exposed from the bottom of the encapsulant; half-etching the leadless leadframe after encapsulation to remove the leads and the sacrificial pads and to electrically isolate the ball pads and expose the bottom surfaces of the ball pads; and jointing a plurality of solder balls on the ball pads.