Patent ID: 7504315

Claim:
A method of transporting a semiconductor device comprising the steps of: (a) preparing a plurality of trays each of which has first accommodating portions on a main surface thereof and second accommodating portions on a back surface thereof which is on a side opposite to the main surface; and (b) transporting semiconductor chips to which the thickness reduction treatment is applied to a desired place in a state that the semiconductor chips are accommodated in spaces defined at positions where the first accommodating portions of the main surface of the lower-stage tray and the second accommodating portions of the back surface of the upper-stage tray are overlapped to each other when the trays are stacked in a plurality of stages, wherein on bottom surfaces of the second accommodating portions formed over the back surface of the tray which face the semiconductor chips, projections having a height which is insufficient to bring the projections into contact with the semiconductor chips are formed, wherein a total occupying area of the projections within the bottom surface of the second accommodating portion is equal to or less than a total area of a region of the bottom surface of the second accommodating portion where the projections are not formed, and wherein the semiconductor chip is accommodated in a state that the main surface of the semiconductor chip faces the bottom surface of the second accommodating portion, a polymide-based resin film is exposed on the main surface of the semiconductor chip, and external terminals are exposed through opening portions formed in the resin film.