Patent ID: 8829676

Claim:
A package comprising: a device die comprising a substrate; a molding compound contacting a sidewall of the substrate; a metal pad over the substrate; a passivation layer comprising a portion covering an edge portion of the metal pad; a metal pillar over and electrically coupled to the metal pad; a dielectric layer over the passivation layer; a package material formed of an additional molding compound or a polymer over the dielectric layer, wherein the dielectric layer comprises a bottom portion between the passivation layer and the package material, and a sidewall portion between and contacting a sidewall of the metal pillar and a sidewall of the package material; a polymer layer over the package material, the molding compound, and the metal pillar; a post-passivation interconnect (PPI) extending into an opening in the polymer layer and electrically coupled to the metal pillar, wherein the PPI further comprises a portion directly over the polymer layer; and a solder ball over the PPI and electrically coupled to the PPI.