Diodes Incorporated

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AH1804 (Obsolete)

Micropower Omnipolar Hall Effect Switch

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The AH1804 is a micropower Omnipolar Hall effect switch IC with a single output driver with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs the average supply current is only 12µA at 3.3V. To support battery powered equipment the AH1804 has been optimized to operate over the supply range of 2.5V to 3.6V and uses a sleep function to minimise power consumption. To minimize PCB space the AH1804 is packaged in small low profile package. The outputs of the AH1804 are switched with either a North or South pole of sufficient strength. 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 AH1804 is available in DFN1216-4 and SC59 packages.


• Cover switch in clam-shell and slide cellular phones • Cover switch in Netbook, Notebook, Tablets and PDAs • Camcorders
  • Contact-less switch in portable and battery powered applications
  • 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) 12
    Average Supply Current (mA) 0.012
    Compliance (Only Automotive supports PPAP) Standard
    Compliance(Only Automotive supports PPAP) Standard
    Inactive Output State (B < Brp) High
    Max OperatingPoint ±Bop(Guass) 60
    Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 60
    Min OperatingPoint ±Bop (Guass) 20
    Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 20
    Min ReleasePoint ±Brp(Guass) 15
    Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 15
    Operating Ambient Temperature (°C) -40 to 85
    Operating Ambient Temperature Range (°C) -40 to 85
    Operating Voltage (V) 2.5 to 3.6
    Operating Voltage (V) 2.5 to 3.6
    Output Type Push-Pull
    Outputs Single
    AEC Qualified No
    Sensitivity High
    Typ OperatingPoint ±Bop(Guass) 40
    Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
    Typ ReleasePoint ±Brp(Guass) 32
    Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 32
    Type Omnipolar

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    Technical Documents

    Recommended Soldering Techniques


    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