The Hall masterslice transducer combines modern IC (integrated circuit) technology with a modular design concept to provide a flexible multifunction approach to magnetic sensing. Its sensing element, a controllable Hall cell, is integrated with the associated circuitry on a masterslice chip, mounted in a flux concentrator module that forms the basic building block for diverse application packages. The device has several auxiliary control electrodes that allow fixed or externally variable offset voltage control and magnetic field simulation, as well as threshold, hysteresis, and gain adjustments. Integral flux concentrators provide the module with an efficient magnetic flux path and chip cooling. Three application categoriesswitches, proximity sensors, and current sensorsare discussed and various application package designs are presented.