Diodes Incorporated

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.


Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

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27V Resistive Pull-Up Hall Effect Latch

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The AH3712 is a high-voltage, high-sensitivity, Hall-effect latch IC designed for commutation of brushless DC motors, flow meters, linear encoders, and position sensors in industrial and consumer home appliances and personal care applications. To support a wide range of demanding applications, the design is optimized to operate over a 3.0V to 27V supply range. With chopper stabilized architecture and an internal bandgap regulator to provide temperature-compensated supply for internal circuits, the AH3712 provides a reliable solution over the whole operating range. The output also has an overcurrent limit.

The single open-drain output can be switched on with a South pole of sufficient strength and switched off with a North pole of sufficient strength. When the magnetic-flux density (B) perpendicular to the package is larger than the operate point (BOP), the output is switched on (pulled low). The output is held and latched until magnetic-flux density reverses and becomes lower than the release point (BRP).


  • Bipolar Latch
    • AH3712/AH3712A: South Pole On, North Pole Off
    • AH3712B: South Pole Off, North Pole On
  • 0V to 27V Operating Voltage Range
  • High Sensitivity: BOP and BRP of ±25G Typical
  • Resistant to physical stress
  • Single Open-Drain (AH3712, AH3712B) or
  • Internal Pull-Up Resistor (AH3712A)
  • Output Polarity:
    • Direct: AH3712, AH3712A
    • Inverted: AH3712B (*Future product)
  • Output with Overcurrent Limit
  • Chopper-Stabilized Design Provides
    • Superior Temperature Stability
    • Minimal Switch-Point Drift
    • Enhanced Immunity to Stress
  • Good RF Noise Immunity
  • -40°C to +125°C Operating Temperature
  • ESD HBM: 8kV, CDM: 1kV
  • Industry-Standard SC59, SOT23 and SIP-3 Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • An automotive-compliant part is available under separate datasheet (AH3712Q)


  • Brushless DC motor commutation
  • Revolutions per minute (RPM) measurements
  • Flow meters
  • Angular and linear encoders and position sensors
  • Contactless commutation, speed measurements, and angular position sensing/indexing in consumer home appliances, office equipment, and industrial applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
AEC Qualified No
Type Latch
Outputs Single
Output Type Pull-Up Resistor
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High
Key Feature Resistant to Physical Stress
Operating Voltage (V) 3 to 27
Average Supply Current (mA) 2.8
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 10
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 25
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 40
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -40
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -25
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) -10
Output Current Capability (mA) 50
Operating Ambient Temperature (°C) -40 to 125

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