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AH1812 (Obsolete)

Micropower Omnipolar Hall Effect Switch

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The AH1812 is a high sensitivity micropower Omnipolar Hall effect switch IC with open drain for pull up flexibility. Designed for portable and battery powered equipment such as cellular phones and portable PCs, the average supply current is only 4.3µA at 1.85V. To support portable equipment the AH1812 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1812 is available in small low profile packages. The single opend drain 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 operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp). The output will remain off when there is no magnetic field. The AH1812 is available in a small low profile X1-DFN1216-4 package.


  • Cover or Display Switch in Low Profile Portable PCs (eg Ultrabooks)
  • Open and Close Detect for Flip/Slide Cellular Phones
  • Holster or Cover Detect for Cellular Phones and Tablet PCs
  • Digital Still, Video Cameras and Handheld Gaming Consoles
  • Contactless switch
  • Product Specifications

    Product Parameters

    # Outputs 1
    ActiveHigh orLow Low
    Active Output State (B > Bop) Low
    AEC Qualified No
    Compliance (Only Automotive supports PPAP) No
    Average Supply Current (µA) 4.3
    Average Supply Current (mA) 0.0043
    Compliance (Only Automotive supports PPAP) Standard
    Compliance(Only Automotive supports PPAP) Standard
    Inactive Output State (B < Brp) High-Z
    Max OperatingPoint ±Bop(Guass) 40
    Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
    Max ReleasePoint ±Brp(Guass) 35
    Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 35
    Min OperatingPoint ±Bop (Guass) 16
    Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 16
    Min ReleasePoint ±Brp(Guass) 11
    Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 11
    Operating Ambient Temperature (°C) -40 to 85
    Operating Ambient Temperature Range (°C) -40 to 85
    Operating Voltage (V) 1.6 to 3.6
    Operating Voltage (V) 1.6 to 3.6
    Output Type Open Drain
    Outputs Single
    AEC Qualified No
    Sensitivity High
    Typ OperatingPoint ±Bop(Guass) 30
    Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 30
    Typ ReleasePoint ±Brp(Guass) 20
    Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 20
    Type Omnipolar

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    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-2587 2022-05-13 2022-11-13 Device End of Life (EOL)
    PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site