Patent ID: 8304268

Claim:
A fabrication method of a semiconductor package structure, comprising the steps of: providing a metal plate having a first surface and an opposite second surface, wherein the first surface has a die mounting area and a plurality of contact pad areas; patterning the metal plate from the first surface towards the second surface so as to form a plurality of concave portions in the metal plate outside the die mounting area and the contact pad areas; forming a dielectric layer on the metal plate thus patterned, wherein the die mounting area and the contact pad areas are exposed from the dielectric layer; forming a metal layer on the first surface and the dielectric layer, followed by forming a plurality of metal pads on the second surface, the metal layer comprising a die pad corresponding in position to the die mounting area and a plurality of traces, the traces each comprising a trace body, a bond pad extending towards a periphery of the die pad, and a trace end opposite to the bond pad and connected to a corresponding one of the contact pad areas, and the metal pads corresponding in position to the die mounting area and the contact pad areas, respectively; mounting a semiconductor chip on the die pad, followed by connecting electrically the semiconductor chip to the bond pads through a plurality of bonding wires; forming an encapsulant to cover the semiconductor chip, the bonding wires, the metal layer, and the dielectric layer; removing the portions of the metal plate not covered by the metal pads so as to form a plurality of metal pillars corresponding in position to the die mounting area and the contact pad areas, respectively, wherein the metal pillars protrude from the dielectric layer; and performing a singulation process to obtain a semiconductor package structure.