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The AH1921 is an ultra-low power digital Omnipolar Hall Effect switch IC from Diodes broad Hall Effect switches family. Thanks to the hibernating clocking system, the average supply current is only 1.6μA at 3V, which makes the AH1921 perfectly fit battery-powered consumer products, Gas or water meter, smoke detectors and IoT devices. The wider range of supply voltage (1.6V to 5.5V) extends battery operating time and supports low voltage system microcontrollers, which provides great flexibility for system design. The advanced chopper stabilized design provides superior stability on switch operating point over temperature and supply voltage. The high ESD level up to 6kV helps to improve the system robustness.
The open drain output can be switched on with either South or North pole of sufficient 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 AH1921 comes with industry standard SC59 package.
Omnipolar Operation (North or South Pole)
Supply Voltage of 1.6V to 5.5V
Chopper Stabilized Design Provides:
Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Physical Stress
Open Drain output
-40°C to +85°C Operating Temperature
High ESD Capability of 6kV (Human Body Model)
Small Low Profile, SC59 Package
Totally Lead-Free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device
Smart Cover or Dock Detect for Cellular Phones and Tablet PCs
Gas or Water Consumption Measurement in Remote, Battery-Operated Utility Meters