Diodes Incorporated introduced the AH1911/AH1921 digital Hall effect sensors, which combine stable operating and release points (BOP and BRP) with ultra low-power operation. The third-generation devices will respond to either polarity of magnetic field and use a ‘hibernating clock’ system to reduce average current consumption to 1,6 μA at 3 V supply.
A wide operating voltage range of 1,6 V to 5,5 V enables the part to be used with a variety of system voltages. Operating and release points for the magnetic switch are tightly controlled over temperature and supply voltage due to advanced stabilising techniques for accurate and repeatable performance. Flux density switching points are typically ±60 Gauss (6 mT) to operate and ±45 Gauss (4,5 mT) to release.
The AH1911/21 is ideal for battery-powered devices where the low power consumption and wider operating voltage range help to extend battery life. Typical applications include medical and consumer products, tamper detection for e-meters, smoke detectors, IoT devices and general level/proximity detection.
Available in the industry-standard three-pin SC59 package, the AH1911 and AH1921 feature push-pull and open-drain outputs, respectively. Both are specified over the -40°C to +85°C temperature range and have a high ESD rating of 6 kV (Human Body Model).
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