US Patent 11562795 Semiconductor memory device

A semiconductor memory device includes a controller which executes a read operation. In the read operation, the controller applies first and second read voltages to a word line, reads data at each of first and second times, applies the first voltage to a source line at each of the first and second times, applies a second voltage to the source line during the application of the first read voltage to the word line and before the first time, and applies a third voltage to the source line during the application of the second read voltage to the word line and before the second time.