OH4N Unipolar Hall effect IC

Part No: OH4N

Function: Unipolar

Operating voltage: 4-30V

Output Current: 50mA

Operating Point (Bop): -20mT

Release Point(Brp): >-20mT <-3mT

Operating Temp: -40~ 125℃

Package: SOT23-3


OH4N unipolar hall IC includes an on-chip Hall voltage generator for magnetic sensing, an amplifier that amplifies the Hall voltage, a schmitt trigger to provide switching hysteresis for noise rejection, and an open-collector output. It detects the changes of Magnetic field (N pole) and output a digital voltage signal. With the typical feature of wide range of working Voltage, operate temperature and high load capacity, OH4N performs well in many applications, such as position control, speed detection and flow detection as a non-contact magnetic sensor.


  • High load capacity
  • The good consistency
  • A wide range of power supply voltage
  • High reliability
  • Working with N pole


  • The brushless DC motor, DC fans, DC water pump
  • The home appliance control panel
  • speed sensor, position detecting, counting
  • The autoignition
  • safety alarm device

Absolute Maximum Ratings (TA=25℃)

Supply Voltage VCC··············3.8-30V                Operating Temperature Range TA ········-40~150℃

Output Current  IO·················50mA                 Storage Temperature RangeTS ················-65~150℃

Electrical Characteristics (Ta= 25°C)

Parameter Symbol Conditions Value Unit
Min Typ Max
Supply Voltage VCC 4 30 V
Output Saturation Voltage VOL VCC=5V,  RL=1KΩ,  B≥BOP 200 400 mV
Output Leakage Current IOH Vo=Vccmax , B≤BRP 1.0 10 μA
Supply Current ICC Vo=Vccmax , B≤BRP 5 mA
Output Rise Time tr Vcc=5V, RL=1KΩ, CL=20pF 0.5 μS
Output Falling Time tf 0.5 μS


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

Parameter symbol Value Unit
Min Typ Max
Operate Point BOP -8 -20 mT
Release Point BRP -3 -15 mT
Hysteresis BH 5 mT

Datasheet (PDF)  OH4N Unipolar hall IC N pole