Patent ID: 6865951

Claim:
A semiconductor pressure sensor comprising: a semiconductor substrate having a principle surface corresponding to (110)-face; a pressure detecting diaphragm formed on the principle surface of the semiconductor substrate; and strain gage resistors formed on the diaphragm for constituting a bridge circuit and outputting a detection signal in connection with strain of the diaphragm, wherein the pressure detecting diaphragm has a planar shape comprised of four sides, the fours sides including a pair of first sides extending along <110> crystal axis direction and a pair of second sides extending along <100> crystal axis direction, wherein the strain gage resistors comprise a pair of center gages disposed at a center portion of the pressure detecting diaphragm along the <110> crystal axis direction and a pair of side gages disposed be nearer to a peripheral portion of the pressure detecting diaphragm than the center gages so both of the pair of side gages are disposed at a portion of the semiconductor substrate having approximately a same stress distribution.