Ultra-Low-Power Hall-Effect Sensors Fit Small Form Factors
Diodes Inc.’s latest monolithic Hall-effect proximity sensors—the AH138x and AH139x series—are a fit for small-form-factor battery-powered devices.
The 1.6- to 5.5-V operating voltage of these Hall-effect switches allows them to be powered directly from a portable device’s battery, and the ultra-low 1.1-µA supply current at 1.85 V and 1.6 µA suits them for everything from smartphones and wearables to household appliances. Packaging options include the DFN1010-4, DFN1410-4, and SOT23.
According to Diodes, the first output in the dual-output AH139x series responds to a North pole, and the second responds to a South pole with typical operating points of 25G (AH1391) and 30G (AH1392). The single output on the AH138x series responds to a South pole on the part-marking side with typical operating points of 18G (AH1381), 30G (AH1382), and 45G (AH1383).
The tight operating window of the new switches helps reduce the magnetic spread, while the chopper-stabilized design provides minimal switch point drift and better temperature stability. For robustness, the parts have electrostatic-discharge (ESD) protection of up to 8 kV for the AH138x and 6 kV for the AH139x series. The devices add push-pull outputs that don’t require an external pull-up resistor. The result is a simplified system design, saving PCB space and BOM costs.
