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27V Open-Drain Hall Effect Latch

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The DIODES™ AH3712Q is an AEC-Q100 qualified, high-voltage, high-sensitivity, Hall-effect latch IC designed for commutation of brushless DC motors and their speed measurements, angular or linear encoders, and position sensors in automotive applications. To support a wide range of demanding applications, the device 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 AH3712Q provides a reliable solution over the whole operating range. The device has a reverse blocking diode with Zener clamps on the supply and output, which 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).

The SOT23 and SC59 packages have opposite magnetic operating and release polarity. The SOT23, SIP-3 (Bulk), and U-DFN2020-6/SWP packages require their south pole on the part-marking side while the SC59 requires its south pole to the non-part-marking side.


  • Bipolar Latch (South Pole: On, North Pole: Off)
  • 0V to 27V Operating Voltage Range
  • High Sensitivity: BOP and BRP of ±25G Typical
  • Resistant to Physical Stress
  • Single, Open-Drain Output AH3712Q or Internal Pull-Up AH3712AQ (*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
  • Reverse-Blocking Diode and Zener Clamp on Supply
  • -40°C to +150°C Operating Temperature
  • ESD HBM: 8kV, CDM: 1kV
  • Industry-Standard SC59, SOT23, SIP-3, and U-DFN2020-6/SWP Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The DIODES™ AH3712Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • 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 automotive applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Automotive
AEC Qualified Yes
Type Latch
Outputs Single
Output Type Open Drain
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High-Z
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 150

Technical Documents

Recommended Soldering Techniques