Patent ID: 8044509
Filing Date: 2011-10-25
Classification: H01L,Y10T

Abstract:
1. A semiconductor device comprising: a semiconductor chip having an obverse surface, a reverse surface opposite the obverse surface, and a plurality of electrodes formed on the obverse surface thereof; a chip mounting portion having an obverse surface on which the semiconductor chip is mounted, a reverse surface opposite the obverse surface, the first side, the second side which faces to the first side, the third side which crosses the first side, and the fourth side which faces to the third side, the obverse surface including a chip fixing area and a plurality of wire connection areas separated from the chip fixing area; a first suspension lead supporting the chip mounting portion, and the first suspension lead connects with an one end of the first side and an one end of the third side; a second suspension lead supporting the chip mounting portion, and the second suspension lead connects with an one end of the second side and an other end of the third side; a third suspension lead supporting the chip mounting portion, and the third suspension lead connects with an other end of the first side and an one end of the fourth side; a fourth suspension lead supporting the chip mounting portion, and the fourth suspension lead connects with an other end of the second side and an other end of the fourth side; a plurality of leads disposed between the each suspension leads; a plurality of first wires connecting selected first ones of the plurality of electrodes of the semiconductor chip with the plurality of leads; a plurality of second wires connecting selected second ones of the plurality of electrodes of the semiconductor chip with the plurality of wire connection areas; and a sealing body having a top surface, a bottom surface opposite the top surface, the sealing body sealing the semiconductor chip, a part of the chip mounting portion, a part of the suspension lead, and a part of each of the plurality of leads, wherein the chip mounting portion is formed larger than the semiconductor chip such that the first, the second, the third, and the fourth sides are positioned outside an outer peripheral edge of the semiconductor chip, wherein the plurality of wire connection areas have a first wire connection area including the first side, a second wire connection area including the second side, a third wire connection area including the third side, and the fourth wire connection area including the fourth side, wherein the chip mounting portion has a first slit which is formed between the semiconductor chip fixing area and the first wire connection area, a second slit which is formed between the semiconductor chip fixing area and the second wire connection area, a third slit which is formed between the semiconductor chip fixing area and the third wire connection area, and a fourth slit which is formed between the semiconductor chip fixing area and the fourth wire connection area, wherein a part of the reverse surface of the semiconductor chip fixing area is exposed from the bottom surface of the sealing body, the reverse surface of each of the wire connection areas and an inside of the each slits are sealed with sealing body; and wherein each of the slits has a first portion which extends along each of the sides, and a second portion at the ends of the first portion which extends from the first portion toward each of the sides.