Patent ID: 7045866

Claim:
A programmable nonvolatile semiconductor memory device comprising: a memory transistor; a word line connected to a gate of the memory transistor; a first insulation layer disposed on the memory transistor; a first metal plug formed in the first insulation layer and on a drain of the memory transistor; a first metal layer formed on the first metal plug; a second insulation layer formed on the first insulation layer and the first metal layer; a second metal plug formed in the second insulation layer and on the first metal layer; a second metal layer formed on the second metal plug; and an insulation film disposed either between the drain of the memory transistor and the first metal plug, between the first metal plug and the first metal layer, between the first metal layer and the second metal plug or between the second metal plug and the second metal layer, wherein a conductive path is provided between the drain of the memory transistor and the second metal layer except the insulation film, and the insulation film is thin enough for dielectric breakdown under application of a predetermined voltage so that a data bit is written in the memory transistor.