Diodes Incorporated
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AH287 (Obsolete)

Two Phase 9V/12V/24V BLDC All-In-One Fan and Motor Driver with Output Zener Clamp

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AH287 is a monolithic fan motor controller with Hall sensor’s capability. It contains two complementary open-drain drivers for motor’s coil driving, automatic lock shutdown and restart function relatively. Rotor-lock shutdown detection circuit turns off the output driver when the rotor is blocked to avoid coil overheat. Then, the automatic recovery circuit will restart the motor. These protected actions are repeated and periodic during the blocked period. Until the blocking is removed, the motor recovers and runs normally.


  • On Chip Hall Sensor
  • Rotor-Locked Shutdown
  • Automatically Restart
  • Built-in Zener Protection for Output Driver
  • Operating Voltage: 3.8V to 28V
  • Output Current: IO(AVE) = 400mA
  • Lead Free Packages: SIP-4L and SOT89-5L
  • SIP-4L and SOT89-5L: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish/ RoHS Compliant
  • Product Specifications

    Product Parameters

    Average OutputDrive Current (mA) 500
    Frequency Generator (FG) and Rotation Detect -
    Lock Detect, Shut-Down and Auto Start Yes
    Operating Ambient Temperature (°C) -40 to 100
    Operating Point Bop Gauss (Max) 60
    Operating Point Bop Gauss (Min) 10
    Operating Point Bop Gauss (Typ) 30
    Operating Voltage (V) 3.8 to 28
    Peak Output Current (mA) 700
    Release Point Brp Gauss (Max) -10
    Release Point Brp Gauss (Min) -60
    Release Point Brp Gauss (Typ) -30
    SupplyCurrent (mA) 2
    Typical Total RDS(ON)(NMOS and PMOS Combined) 2.25 @ 24V
    Typical Zener Breakdown Voltage (V) 55

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