Kioxia Corporation

Tadayoshi Watanabe

Kouji Matsuo

A semiconductor memory device includes first memory layers and second memory layers arranged in alternation in a first direction. First memory layers and second memory layers include memory strings and first wirings connected to these memory strings in common. First memory layers and second memory layers include: signal amplifier circuits electrically connected to the first wirings; second wirings connected to the signal amplifier circuits; first switch transistors connected to the second wirings; third wirings electrically connected to the second wirings via the first switch transistors; and fourth wirings electrically connected to the second wirings without via the first switch transistors. The semiconductor memory device includes: first via-contact electrodes extending in the first direction and connected to the third wirings in first memory layers; and second via-contact electrodes extending in the first direction and connected to the fourth wirings in second memory layers.

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Yokkaichi Mie, Japan

Tadayoshi Watanabe