Patent ID: 7576433

Claim:
A semiconductor memory device comprising: an interposer chip that has a plurality of first internal electrodes formed on a first surface, a plurality of second internal electrodes formed on a second surface opposite to the first surface, a plurality of third internal electrodes formed on the second surface and arranged in a pitch, which is larger than a pitch of the second internal electrodes; and a plurality of core chips that are mounted directly upon each other, and further being mounted on the first surface of the interposer chip and are connected to the first internal electrodes, wherein the interposer chip includes a semiconductor substrate, a re-wiring layer formed on at least one surface of the semiconductor substrate, a plurality of first through electrodes formed in the semiconductor substrate and connecting a part of the first internal electrodes to a part of the second internal electrodes, and a plurality of second through electrodes formed in the semiconductor substrate and connecting a remaining part of the first internal electrodes to a part of the third internal electrodes, and a pitch of the first through electrodes is substantially equal at least to the pitch of the first internal electrodes or to the pitch of the second internal electrodes.