Patent ID: 6965166

Claim:
A semiconductor device comprising: a first semiconductor chip; a second semiconductor chip bonded to the first semiconductor chip in a stacked relation; and a registration structure which causes the first and second semiconductor chips to be positioned with respect to each other with use of a depression-projection engagement, wherein the registration structure includes: a registration recess provided on a surface of the first semiconductor chip opposed to the second semiconductor chip, and a registration projection provided on a surface of the second semiconductor chip opposed to the first semiconductor chip for engagement with the registration recess, wherein the registration projection is a spherical member provided on the surface of the second semiconductor chip, wherein the second semiconductor chip has a bump for electrical connection to the first semiconductor chip, wherein the spherical member has a radius such that a distance between a center thereof and the surface of the second semiconductor chip is greater than a height of the bump as measured from the surface of the second semiconductor chip, wherein, in a registration state, the registration projection is received by the registration recess and the registration structure inhibits relative movement between the first and second semiconductor chips in any direction along the surfaces of the semiconductor chips in a pre-mounted state where the bumps are disposed apart from one another, and wherein the registration projection is deformed into a non-spherical shape in a mounted state where the bumps contact one another.