Patent ID: 7371613

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) providing a wiring substrate having a plurality of unit substrate regions from which semiconductor devices are to be manufactured respectively, the wiring substrate having a first main surface and a second main surface located on the side opposite to the first main surface, with a plurality of first electrodes being formed over the first main surface of each of the unit substrate regions and a plurality of land portions formed over the second main surface of each of the unit substrate regions; (b) mounting semiconductor chips over the unit substrate regions respectively over the first main surface of the wiring substrate and coupling a plurality of second electrodes of the semiconductor chips electrically to the first electrodes of the wiring substrate; (c) forming a sealing resin over the unit substrate regions over the first main surface of the wiring substrate so as to cover the semiconductor chips, thereby forming a sealing body comprising the wiring substrate and the sealing resin; (d) forming grooves in the sealing body from an upper surface side of the sealing resin along dicing regions each formed between adjacent ones of the unit substrate regions; (e) after the step (d), forming external connecting terminals over the land portions respectively in the unit substrate regions over the second main surface of the wiring substrate; and (f) after the step (e), cutting the sealing body from the second main surface side of the wiring substrate along the dicing regions between the unit substrate regions.