The SS400 Series and SS500 Series are small， versatile， digital Hall-effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet. They are designed to respond to alternating North and South poles， or to a South pole only. They are available in bipolar， latching or unipolar magnetics. On-board regulation provides stable operation over a 3.8 Vdc to 30 Vdc supply voltage range. These sensors are capable of continuous 20 mA sinking output and may be cycled as high as 50 mA max. The 3.8 V capability allows for use in many potential low voltage applications. The digital， open collector sinking-type output is easily interfaced with a wide variety of electronic circuits. To provide reliable products and consistent quality， the SS400 Series products are tested at both 25 °C ［75 °F］ and 125 °C ［257 °F］。 All catalog listings in the SS400 Series are qualified for operation up to 150 °C ［302 °F］。