A pressure sensor has a sensor body (2) made at least in part of electrically insulating material, having a first face (2a) and a second face (2b) opposite to one another, and a cavity (3), the cavity (3) being closed at at least one axial end thereof by a diaphragm portion. The pressure sensor (1) comprises a circuit arrangement (5) supported by the sensor body (2) and includes: - a first electrical-circuit pattern, comprising respective tracks made of electrically conductive material deposited on the first face, on its side external to the cavity, there being connected to the first electrical-circuit pattern a plurality of first circuit components, amongst which detection means for detecting bending or deformation of the membrane portion; - a second electrical-circuit pattern (7), comprising respective tracks made of electrically conductive material (10, 11 ) deposited on a region of the second face (2b), there being connected to the second electrical-circuit pattern (7) at least one second circuit component (8; 8') having an active part (8a), that is to be exposed to the fluid, and at least one first connection terminal (8b) and one second connection terminal (8b); and - connection means, which electrically connect the first electrical -circuit pattern to the second electrical-circuit pattern (7) and extend in an axial direction of the sensor body (2). The tracks (10, 11) of the second electrical-circuit pattern (7) comprise at least one first track (10) defining a plurality of first pads (10a) and one second track (11) defining a plurality of second pads (11a), for connection of the first terminal (8b) and of the second terminal (8b) of the second circuit component (8; 8'), respectively. The first and second track (10, 11 ) are prearranged so that the first terminal (8b) and the second terminal (8b) of the second circuit component (8; 8') can be connected to any one of the first pads (10a) and to any one of the second pads (11a), respectively, and/or to the first pad (10a) and to the second pad (11a), respectively, of any one of a plurality of pairs of first and second pads (10a, 11a).