Diodes' AH1902 is a high sensitivity micropower Omnipolar Hall-effect switch IC with internal pull-up and pull-down capability. Designed for portable and battery-powered consumer equipment such as cellular phones and portable PCs to office equipment, home appliances and industrial applications, the average supply current is only 4.3 µA at 1.8 V. To support portable equipment the AH1902 can operate over the supply range of 1.6 V to 3.6 V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1902 is available in small, low-profile X1-DFN1216-4 and X2-DFN2015-6 packages.

The single output is activated with either a north or south pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field.