Patent ID: 6958928

Claim:
A thin film magnetic memory device comprising: a plurality of memory cells, each magnetically storing a data signal; a plurality of data write lines respectively provided corresponding to said plurality of memory cells; a constant current circuit outputting a prescribed constant current; a write circuit selecting any of said plurality of memory cells in accordance with an address signal, supplying an output current from said constant current circuit to the data write line corresponding to the selected memory cell, and writing a data signal to the memory cell; a spare memory cell for replacing a defective memory cell in said plurality of memory cells; and a spare data write line provided corresponding to said spare memory cell; wherein said write circuit selects said spare memory cell instead of said defective memory cell when said defective memory cell is designated by said address signal, and supplies the output current from said constant current circuit to said spare data write line and writes a data signal to said spare memory cell.