Patent attributes
A semiconductor memory device includes a cell string with a plurality of selection transistors, a plurality of dummy transistors and a plurality of memory cell transistors coupled in series therein and a pass transistor (TR) unit with a plurality of pass transistors that transmit a plurality of driving signals to the cell string. The pass TR unit includes a plurality of first pass transistors transmitting a first driving signal with a first level voltage, among the plurality of driving signals, to the plurality of selection transistors, respectively, and a plurality of second pass transistors transmitting a second driving signal with a second level voltage that is higher than the first level voltage, among the plurality of driving signals, to a plurality of dummy transistors, respectively. Each of the second pass transistors has a larger channel area than each of the first pass transistors.