Push-pull, unipolar Hall switches are designed for proximity sensing
5 September 2023 
Monolithic, unipolar Hall-effect switches have been designed by Diodes for proximity sensing in battery-powered applications. They have a low 1.1µA supply current at 1.85V, and 1.6µA at 1.6V to 5.5V, making them suitable for battery-powered portable equipment such as smartphones, laptops and wearables. They are also suitable for domestic appliances, game consoles, and industrial hardware use.
The 1.6V to 5.5V operating voltage allows these Hall-effect switches to be powered directly from a portable device’s battery, eliminating the area and cost of power conversion. The AH139x series models are dual-output, with output 1 responding to a north pole and output 2 responding to a south pole with typical operating points of 25G, in the case of the AH1391 and 30G for the AH1392. The single output on the AH138x series responds to a south pole on the part-marking side with typical operating points of 18G for the AH1381, 30G (AH1382), and 45G (AH1383).
The tight operating window of these switches ensures a lower magnetic spread, says Diodes, while the chopper-stabilised design provides minimal switch point drift and temperature stability. The switches have a strong human body model (HBM) electrostatic discharge (ESD) protection of 8kV for the AH138x and 6kV for the AH139x switches. They also have push-pull outputs that do not require an external pull-up resistor. This simplifies system design, saves board space and lowers the bill of materials, adds the company.
All devices are provided in the industry’s smallest packages, the DFN1010-4 and DFN1410-4. The AH1381, AH1382, and AH1383 versions are additionally available in SOT23 packaging.