The SS41 is a bipolar hall-effect sensor for respond to alternating North and South poles. A built-in regulator provides stable operation over 4.5VDC to 24VDC supply voltage range and internal circuitry prevents sensor damage in case the supply voltage polarity is accidentally reversed. The SS41 hall-effect sensors are small, versatile digital hall-effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet. The open-collector sinking output voltage is easily interfaced with a wide variety of electronic circuits.