The differential magnetoresistive sensor FP 201 D 250-22 consists of two series coupled D-type InSb/NiSb semiconductor resistors. The resitance value of the MRs, which are mounted onto an insulated ferrite substrate, can be magnetically controlled. The sensor is encapsuled in a plastic package with three in-line contacts extending from the base. The basic resistance of the total system in the unbiased state is 2 x 250 . A permanent magnet which supplies a biasing magnetic field is built into the housing.