General Description

    Using low power CMOS process, the AS1803OD is designed for high performance omnipolar detection hall-effect application, such as cover switch, contactless switch, solid state switch and lid close sensor etc battery operation. The hall IC integrated an on-chip hall voltage generator for magnetic sensing, a comparator that amplifiers the hall voltage, a Chopper amplifier, a Schmitt trigger to provide switching hysteresis for noise rejection, and a complementary output.
    AS1803OD is designed to respond to alternating North and South poles. When the magnetic flux density (B) is larger than operate point (BOP), the output will be turned on (low), the output is held until the magnetic flux density (B) is lower than release point (BRP), then turn off (high).
    The device is available in SOT23-3L and SIP-3L package and is rated over the -40°C to 125°C. The all packages are RoHS and Green compliant.


Input Voltage Range : 2.2V to 5.0V

●  Operation Frequency: 20kHZ(min)

●  Omniplar Operation, easy to use as output

●  Very high sensitivity hall sensor

●  Low Power CMOS process technology

●  Chopper stabilization amplifier stage

●  Magnetic Sensitivity (typical)

●  B =±18Gauss, B =±10Gauss

●  Good RF noise immunity

●  Open Drain Output

●  Small Solution Size

●  RoHS & Green Compliant

●  SOT23-3L and SIP-3L Packages

●  -40℃ to +125 ℃ Temperature Range


●  Cover switch in clam-shell cellular phones
●  Cover switch in Notebook, PC/PAD
●  Contact-less switch in consumer products
●  Solid State Switch

●  Handheld Wireless Handset Awake Switch
●  Lid close sensor for battery-powered devise
●  Magnet proximity sensor for reed switch replacement in low duty cycle applications
●  DV, DSC, and White Goods