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Micropower Selectable threshold Omnipolar Hall Effect Switch

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The AH1898 is a micropower magnetic range selectable (Bop/Brp) Omnipolar Hall effect switch IC with internal pull up and pull down capability, designed for portable and battery powered consumer equipment such as cellular phones and portable PCs. To support battery powered equipment and low voltage microcontrollers, the AH1898 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. The average supply current is only 4.3µA typical at 1.80V. The AH1898 has an 8kV ESD rating on the supply and output pins. To minimize PCB space the AH1898 is packaged in the small CSP package (0.81mm x 0.81mm typical). The output is activated with either a north or south pole of sufficient magnetic field strength. The user can select one of two magnetic sensitivity bands via the BSEL pin without the addition of any external components allowing a flexible but small solution. The band select can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pul°C low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field. The AH1898 is available in U-WLB0808-4 package.


  • Open and Close Detect for Cellular Phones
  • Holster or Cover Detect for Cellular Phones and Tablet PCs
  • Cover or Display Switch in Portable PCs
  • Digital Still, Video Cameras and Handheld Gaming Consoles
  • Proximity and Position 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 Selectable Sensitivity
    Operating Voltage (V) 1.6 to 3.6
    Average Supply Current (mA) 0.0043
    Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 43
    Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 60
    Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 80
    Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 35
    Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 50
    Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 70
    Operating Ambient Temperature (°C) -40 to 85

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    RoHS CofC

    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2507 2021-02-03 2021-05-03 Qualification of Additional Wafer Backside Material Supplier