Unipolar hall-effect sensor ics, often referred to as "unipolar switches, " are operated by a positive magnetic field. A single magnet presenting a south polarity (positive) magnetic field of sufficient strength (magnetic flux density) will cause the device to switch to its on state. After it has been turned-on, the unipolar IC will remain turned-on until the magnetic field is removed and the IC reverts to its off state.AH3134
High sensitive hall-effect switch integrated circuits
These hall-effect switches are monolithic integrated circuits with tighter magnetic specifications and high sensitivity, designed to operate continuously over extended temperatures to +150° C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet.
Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic hall-voltage generator, temperature compensation circuitry, small-signal amplifier, schmitt trigger, and an open-collector output to sink up to 25 ma. With suitable output pull up, they can be used with bipolar or CMOS logic circuits.Absolute maximum ratingParameterSymbolValueUnitSupply Voltage VCC 24VMagnetic Flux Density BUnlimitedmTOutput OFF Voltage Vce 40VContinuous Output Current IOL 25mAOperating Temperature Range TAAH31XXE-25~85º CAH31XXL-40~150º CStorage Temperature Range TS-55~150º CElectrical Characteristics TA=25º CParameterSymbolTest conditionType and ValueUnitmintypmaxSupply VoltageVCC4.5-24VOutput Saturation VoltageVOLIout=15mA B> BOP-200400mVOutput Leakage CurrentIOHVout=24V B-0.110μ ASupply CurrentICCVCC=24V Output Open--10mAOutput Rise TimetrRL=820Ω CL=20PF-0.12-μ SOutput Fall TimetfRL=820Ω CL=20PF-0.18-μ SMagnet characteristicsVCC=4.5~24VParameterSymbolAH3135UnitmintypmaxOperate PointBOP--11mTRelease PointBRP3--mTHysteresisBH5--mT