Patent ID: 7292493

Claim:
A semiconductor device comprising: a first electric fuse formed over a semiconductor substrate, the first electric fuse being broken when a current floes therethrough; a first breaker transistor including a source region, a drain region and a gate electrode, the source region and the drain region being disposed in a first surface layer of the semiconductor substrate of a first conductivity type and sandwiching a channel region, the gate electrode controlling a conduction state between the source and drain regions, the drain region being connected to one end of the first electric fuse; a breaker pad connected to another end of the first electric fuse for supplying a fusing current to the first electric fuse; a back-bias pad capable of applying a fixed voltage to the first surface layer independently from both a power supply voltage and a ground potential; and a first fuse information read circuit for reading a breakdown/non-breakdown state of the first electric fuse.