The MCS1802 is a linear Hall-effect current sensor for AC or DC current sensing. The Hall array is differential, which cancels out any stray magnetic field.
A primary conductor with a low resistance allows current to flow close to the IC, which contains high-accuracy Hall-effect sensors. This current generates a magnetic field that is sensed at two different points by the integrated Hall-effect transducers. The magnetic field difference between these two points is then converted into a voltage that is proportional to the applied current. A spinning current technique is used for a low stable offset.
The galvanic isolation between the pins of the primary conductive path and the sensor leads allows the MCS1802 to replace opto-isolators or other isolation devices.
The MCS1802 requires a minimal number of readily available, standard external components. The device’s small footprint saves board area and makes it well-suited for space-constrained applications. The MCS1802 is available in an SOIC-8 package.