Patent ID: 8115290
Filing Date: 2012-02-14
Classification: H01L

Abstract:
1. A storage medium comprising: a semiconductor package having a semiconductor chip, a resin encapsulation that encapsulates the semiconductor chip, and a plurality of electrodes arrayed on a bottom surface of the resin encapsulation; and a substrate including a conductor that joins the electrodes, and having the semiconductor package mounted thereon, wherein the electrodes include a plurality of signal electrodes formed within a central region of the array, and a plurality of dummy electrodes formed in an outer region of the signal electrodes, each of the signal electrodes includes a first pad as a projection-electrode forming pad for a power supply line or a signal line, and a first projection electrode formed on the first pad, and each of the dummy electrodes includes a second pad as a projection-electrode forming pad for a dummy electrode and a second projection electrode formed on the second pad.