Method for producing semiconductor package

A method for producing a semiconductor package including a main semiconductor chip having a semiconductor circuit formed on one surface thereof, at least one subsidiary semiconductor chip stacked on another surface of the main semiconductor chip, and an encapsulation resin covering the subsidiary semiconductor chip, comprising:

• a semiconductor wafer preparation step of preparing a semiconductor wafer which is generally disk-shaped, on whose one surface a peripheral edge region and a main region surrounded with the peripheral edge region are present, in the main region of which many rectangular regions are defined by streets arranged in a lattice pattern, and in each of the rectangular regions of which a semiconductor circuit constituting the main semiconductor chip is disposed;
• a circular concavity formation step of grinding other surface of the semiconductor wafer, except a peripheral edge region corresponding to the peripheral edge region on the one surface, after the preparation step, thereby forming a circular concavity in the other surface of the semiconductor wafer;
• a semiconductor chip stacking step of stacking at least one said subsidiary semiconductor chip on each of many rectangular regions, which corresponds to each of the rectangular regions, on a bottom surface of the circular concavity of the semiconductor wafer after the circular concavity formation step;
• an encapsulation resin formation step of filling a molten resin into the circular concavity of the semiconductor wafer, and curing the resin, after the semiconductor chip stacking step, thereby forming an encapsulation resin covering the subsidiary semiconductor chips;
• and
• a separation step of cutting the encapsulation resin, together with the semiconductor wafer, along the streets, to separate the semiconductor wafer and the encapsulation resin into many of the semiconductor packages.