Diodes Incorporated
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AH2985 (Not Recommended for new design)

NRND = Not Recommended for New Design


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The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage.

To help protect the motor coils, the AH2985 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device.

The AH2985 is available in TO94.


  • Single-Chip Solution
  • Operating Voltage: 2.5V to 15V
  • Built-In Hall Sensor and Input Amplifier
  • Rotor Lock Protection (Lock Detection, Output Shutdown and Automatic Re-Start)
  • Built-In Reverse Voltage Protection Diode
  • Built-In Zener Protection for Output Drivers
  • Average Output Current up to 500mA
  • Package: TO94
  • “Green” Molding Compound
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • Two-Coil BLDC Cooling Fans
  • Low Voltage - Low Power BLDC Motors

Product Specifications

Product Parameters

Average OutputDrive Current (mA) 500
Frequency Generator (FG) and Rotation Detect N/A
Lock Detect, Shut-Down and Auto Start -
Operating Ambient Temperature (°C) -40 to 105
Operating Point Bop Gauss (Max) 60
Operating Point Bop Gauss (Min) 5
Operating Point Bop Gauss (Typ) 30
Operating Voltage (V) 2.5 to 15
Peak Output Current (mA) 800
Release Point Brp Gauss (Max) -5
Release Point Brp Gauss (Min) -60
Release Point Brp Gauss (Typ) -30
SupplyCurrent (mA) 3.5
Typical Total RDS(ON)(NMOS and PMOS Combined) -
Typical Zener Breakdown Voltage (V) -

Related Content

Quality Documentation

Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2654 2024-02-15 2024-04-28 Device End of Life (EOL)


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