Patent ID: 9741646
Date: 2017-08-22
CPC Classifications: H01L,Y10T

Claim:
1. A method of fabricating a package substrate, comprising: (A) providing a carrier, comprising a top surface; (B) forming a first wiring layer, comprising a plurality of conductive wires on the top surface of the carrier; (C) forming a conductive pillar layer having a plurality of metal pillars on the first wiring layer, wherein each metal pillar has a width different from that of each conductive wire; (D) providing a mold container and an epoxy-based molding compound in the form of powder or sheet, melting the epoxy-based molding compound and loading the epoxy-based molding compound into the mold container, and pressing the mold container against carrier and concurrently curing the epoxy-based molding compound to form an epoxy-based molding compound layer which covers all the first wiring layer and the metal pillars on the carrier in a single step, wherein the epoxy-based molding compound layer covers the first wiring layer, the metal pillars on the carrier, and the top surface of the carrier; (E) exposing the metal pillars by removing a part of the epoxy-based molding compound layer; (F) forming a second wiring layer on the epoxy-based molding compound layer and the exposed parts of the metal pillars; and (G) forming a protection layer on the second wiring layer.