Patent ID: 9735079
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A package substrate, comprising: a redistribution layer having a plurality of top openings on a topmost surface of the dielectric layer, wherein each top opening among the plurality of top openings exposes a top surface of a corresponding top metal pad among the plurality of top metal pads; a molding compound wrapping four lateral sides and a bottom side of the dielectric layer; a plurality of bottom openings on a bottom side of the molding compound, wherein each bottom opening among the plurality of bottom openings is aligned with a bottom side of a corresponding bottom metal pad among the plurality of bottom metal pads; and a plurality of solder balls on the bottom side of the molding compound, wherein each solder ball among the plurality of solder balls is coupled, via a corresponding bottom opening among the plurality of bottom openings, to the bottom side of the corresponding bottom metal pad, each of the plurality of solder balls is partially embedded in the molding compound, and the topmost surface of the dielectric layer is flush with a topmost surface of the molding compound.