Diodes Incorporated
X2 DFN1010 4

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Ultra Low-Voltage High-Sensitivity Micropower Omnipolar Hall-Effect Switch

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The AH1899B is a high-sensitivity micropower, Omnipolar Hall-effect switch IC with internal pullup and pulldown capability. Designed for portable and battery-powered equipment, such as cellular phones and portable PCs, the average supply current is only 0.95µA at 1.2V and 1.1µA at 1.8V. To support portable equipment, the AH1899B can operate over the supply range of 1.1V to 2.0V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space, the AH1899B is available in a small low-profile X2-DFN1010-4 (Type B) package.

The output is activated with either a north or south pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than the operate point (BOP), the output is turned on (pulled low). The output is turned off when B becomes lower than the release point (BRP). The output will remain off when there is no magnetic field.


  • Omnipolar Operation (North or South Pole)
  • Supply Voltage of 1.1V to 2.0V
  • Micropower Operation
  • Chopper Stabilized Design Provides:
    • Superior Temperature Stability
    • Minimal Switch Point Drift
    • Enhanced Immunity to Physical Stress
  • No External Pullup Resistors Required
  • Good RF Noise Immunity
  • -40°C to +85°C Operating Temperature
  • Small Low-Profile X2-DFN1010-4 (Type B) Package
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Cover or display switches in portable PCs
  • Open and close detection for cellular phones
  • Holster or cover detection for cellular phones and tablet PCs
  • Digital still, video cameras, and handheld gaming consoles
  • Contactless switches

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
AEC Qualified No
Type Omnipolar
Outputs Single
Output Type Push-Pull
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High
Key Feature Ultra Low Voltage, Micropower
Operating Voltage (V) 1.1 to 2.0
Average Supply Current (mA) 0.95
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 20
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 30
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 10
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 20
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 30
Output Current Capability (mA) 3
Operating Ambient Temperature (°C) -40 to 85

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