Patent ID: 8309401

Claim:
A manufacturing method of a non-leaded package structure, comprising: providing a metal base plate, having an upper surface and a lower surface opposite to each other; patterning the upper surface and the lower surface of the metal base plate to form a plurality of first protruding parts and at least a second protruding part on the upper surface and a plurality of first recess patterns on the lower surface corresponding to the first protruding parts; respectively forming a first solder layer in each of the first recess patterns; mounting a chip on the second protruding part; forming a plurality of bonding wires electrically connecting the chip to the first protruding parts respectively; forming an encapsulant on the upper surface of the metal base plate, wherein the encapsulant covers the chip, the first protruding parts, the second protruding part and the bonding wires; and perform a back etching process on the lower surface of the metal base plate with the first solder layer serving as an etch mask to partially remove the metal base plate until the encapsulant is exposed and a lead group is defined, wherein the lead group comprises at least a die pad carrying the chip and a plurality of leads isolated to one another, and a lower surface and a portion of at least a side surface of each of the leads are exposed from the encapsulant and partially covered by the first solder layer.