OH37 Unipolar Hall effect IC

Part No: OH37

Function: Unipolar

Operating voltage: 4.5-24V

Output Current: 25mA

Operating Point (Bop): <18mT

Release Point(Brp): >2mT

Operating Temp: -40~ 85℃

Package: SOT23


OH37 Hall switch IC is internally consisted by reverse voltage protection device, voltage regulator, hall voltage generator, a differential amplifier, Schmitt trigger and the open collector output level, which can change magnetic field signal into digital voltage output. OH37, with the feature of small size (SOT23 package) and stable performance in -40~85℃, have been widely used in various fields as a non-contact switch IC.


  • 5V to 24V DC operation voltage
  • Open-Collector pre-driver
  • 25mA maximum sinking output current.
  • Reverse Polarity Protection


  • Speed measurement
  • Home appliances
  • Position detection
  • Flow measurement

Absolute Maximum Ratings (TA=25℃)

Supply Voltage VCC··············4.5-24V    Operating Temperature Range TA ···········-40~85℃

Output Current IO···················25mA     Storage Temperature RangeTS ················-55~150℃

Electrical Characteristics (Ta= 25°C)

Parameter Symbol Conditions Value Unit
Min Typ Max
Supply Voltage VCC 4.5 24 V
Output Saturation Voltage VOL Vcc=5V, RL=1KΩ,B≥BOP 200 400 mV
Output Leakage Current IOH Vout=Vccmax,B≤BRP 1.0 10 μA
Supply Current ICC VCC=Vccmax OC output 3 mA
Output Rise Time tr Vcc=5V, RL=820Ω, CL=20pF 0.13 μS
Output Falling Time tf 0.10 μS


Magnetic Characteristics (Ta= 25°C) (1mT = 10 Gauss)

Parameter symbol Value Unit
Min Typ Max
Operate Point BOP 18 mT
Release Point BRP 2 mT
Hysteresis BH 6 8 mT

Datasheet (PDF) : OH37 Unipolar Hall effect IC