Diodes Incorporated
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Micropower Selectable threshold Omnipolar Hall Effect Switch

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The AH1894 is a high sensitivity, magnetic range selectable micropower Omnipolar Hall effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average power consumption is only 8uW at 1.85V. To support portable equipment the AH1894 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. Based on chopper stabilized architecture and high ESD capability the AH1894 provides a reliable solution over the whole operating range. To minimize PCB space the AH1894 is available in small low profile packages. The single 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) 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 AH1894 is available in a small low profile X1-DFN1216-4 and leaded SOT553 packages


  • Holster or Cover Detect for Cellular Phones and Tablet PCs
  • Open and Close Detect for Flip/Slide Cellular Phones
  • Cover or Display Switch in Low Profile Portable PCs (eg Ultrabooks)
  • Digital Still, Video Cameras and Handheld Gaming Consoles
  • Door, Lids and Tray Position Switches
  • Level, Proximity and Position Switches
  • Contact-Less Switches in Home Appliances and Industrial Applications
  • 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) 25
    Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
    Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 55
    Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 20
    Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 30
    Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 45
    Operating Ambient Temperature (°C) -40 to 85

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    Technical Documents

    Recommended Soldering Techniques


    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-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site