Diodes Incorporated
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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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High-Voltage Automotive Hall-Effect Unipolar Switch

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The AH332XQ is an AECQ100 qualified high-voltage Hall-effect unipolar switch IC designed for position and proximity sensing in automotive applications such as in seat and seatbelt buckle, steering lock/immobilization, gear stick, transmission actuator and gear position, HVAC compression, wiper, door/trunk closure, etc. To support a wide range of the demanding applications, the design has been optimized to operate over the supply range of 3.0V to 28V. With chopper stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH332XQ provides a reliable solution over the whole operating range. For robustness and protection, the device has a reverse blocking diode with a Zener clamp on the supply. The output has an overcurrent limit and a Zener clamp.

The single open-drain output can be switched on with South 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) and is held on until the magnetic flux density B is lower than the release point (BRP).

The magnetic operating and release polarity is opposite for SOT23 (Type S) and SC59 packages. The SOT23 (Type S), SIP-3 (Ammo Pack), and SIP-3 (Bulk Pack) packages require south pole to the part marking side to operate while SC59 requires south pole to the non-part marking side.


  • Unipolar Operation
  • High Sensitivity: BOP and BRP of 30G to 275G and 20G to 250G Typical
  • Single Open-Drain Output with Overcurrent Limit
  • 0V to 28V Operating Voltage Range
  • 40V Load Dump Protection
  • Resistant to Physical Stress
  • Chopper Stabilized Design Provides
    • Superior Temperature Stability
    • Minimal Switch Point Drift
    • Enhanced Immunity to Stress
  • Good RF Noise Immunity
  • Reverse Blocking Diode
  • Zener Clamp on Supply and Output Pins
  • -40°C to +150°C Operating Temperature
  • High ESD HBM: 8kV, CDM: 1kV
  • AEC-Q100 Grade 0 Qualified
  • Industry Standard SC59, SOT23 (Type S), SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack) Packages
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AH332XQ 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/


  • Position and proximity sensing in automotive applications
  • Seat positions
  • Seatbelt buckles
  • Steering locks/immobilization
  • Gear sticks
  • HVAC compression
  • Transmission actuators
  • Transmission gear positions
  • Wipers
  • Sunroofs and windows
  • Door/trunk closures
  • Door locks
  • Contactless switches

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Automotive
AEC Qualified Yes
Type Unipolar
Outputs Single
Output Type Open Drain
Active Output State (B > Bop) Low
Inactive Output State (B < Brp) High-Z
Key Feature Resistant to Physical Stress
Operating Voltage (V) 3 to 28
Average Supply Current (mA) 3
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 68
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 80
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 100
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 40
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 60
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 80
Output Current Capability (mA) 30
Operating Ambient Temperature (°C) -40 to 150

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