ULTRA-LOW POWER DIGITAL OMNIPLOAR
The AH1911/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 AH1911/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
The single push-pull for AH1911 or open drain for AH1921 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 AH1911/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
AH1911 is Push-Pull Output and AH1921 is 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 (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Smart Cover or Dock Detect for Cellular Phones and Tablet PCs
Gas or Water Consumption Measurement in Remote, Battery-
Operated Utility Meters
Medical Devices, IoT Systems
Level, Proximity and Position Switches
E-Locks, Smoke Detectors, Appliances
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit (Note 4)
1.6V to 5.5V
1.6V to 5.5V
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to
the VDD pin as possible.
Document number: DS41109 Rev. 1 - 2
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