AH1911/AH1921

Document number: DS41109 Rev. 1 - 2

1 of 9

www.diodes.com

September 2018

© Diodes Incorporated

AH1911/AH1921

ULTRA-LOW POWER DIGITAL OMNIPLOAR

HALL-EFFECT SWITCH

Description

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

system robustness.

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

The AH1911/AH1921 comes with industry standard SC59 package.

Features



Omnipolar Operation (North or South Pole)



Supply Voltage of 1.6V to 5.5V



Micropower Operation



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)

Pin Assignments

(Top View)

1 VDD

GND 3

2 OUTPUT

SC59

Applications



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

Notes:

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

Lead-free.

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.

AH1911

1.6V to 5.5V

OUTPUT

GND

VDD

AH1921

1.6V to 5.5V

OUTPUT

GND

VDD

Note:

the VDD pin as possible.