Patent ID: 7101733

Claim:
A manufacturing method of a leadframe with a chip pad for two-sided stacking, comprising: providing the leadframe comprising the chip pad and a plurality of leads, wherein the chip pad has an upper surface for carrying at least a chip and a lower surface, and the leads are disposed on the periphery of the chip pad; forming a dielectric adhesive layer on the lower surface of the chip pad, and adhering a metal plate on the dielectric adhesive layer; forming at least a through hole passing through the chip pad, the dielectric adhesive layer and the metal plate; forming an electrically-conductive material within the through hole for electrically connecting the metal plate and the chip pad; patterning the metal plate to form a first trace layer, wherein the first trace layer comprises a first connecting pad electrically connected to the electrically-conductive material; patterning the chip pad to form a second trace layer, wherein the second trace layer comprises a second connecting pad electrically connected to the electrically-conductive material; and forming a first solder mask on the first trace layer, wherein the first solder mask exposes the first connecting pad of the first trace layer.