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Two-Wire Automotive Hall Effect Unipolar Switches

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The AH3231Q-AH3234Q/AH3270Q-AH3272Q are high voltage, high sensitivity, two-wire Hall Effect Unipolar/Latch switch ICs with automotive-compliant AEC-Q100 qualification; designed for position and proximity sensing in automotive applications, such as seat and seatbelt buckle, transmission actuator, gear position, wiper, door/trunk closure, etc.

To support a wide range of demanding applications, the design is optimized to operate over a supply range of 2.7V to 27V. These features include a chopper-stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits. For robustness and protection, the device has built-in reverse blocking diode with a Zener clamp on the supply.

The built-in thermal protection also shuts down the chip if temperature rises to an abnormal value. This will automatically restart the chip once the junction temperature drops below the safe value.

For the AH3231Q, AH3232Q, AH3233Q, and AH3234Q two-wire unipolar switches: when the flux density (south pole) exceeds BOP, the supply current state is turned on (low or high). The output is held until a magnetic flux density falls below BRP, causing output current to be turned off.

For the AH3270Q, AH3271Q, and AH3272Q two-wire latch switches: when the magnetic flux density is larger than BOP, output current is turned on (high). The output state is held until a magnetic flux density reversal falls below BRP, causing output current to be turned off (low).


  • Unipolar: AH3231Q, AH3232Q, AH3233Q, AH3234Q

Latch: AH3270Q, AH3271Q, AH3272Q

  • Output Polarity:
    • Direct: AH3232Q, AH3233Q
    • Inverted: AH3231Q, AH3234Q
  • Wide Supply Voltage Operation: 2.7V to 27V
  • Temperature Coefficient -1100ppm/°C (AH3232Q, AH3233Q, AH3234Q)
  • Chopper Stabilized Design Provides:
    • Superior Temperature Stability
    • Minimal Switch Point Drift
    • Enhanced Immunity to Stress
  • Battery polarity reverse connection protection
  • Transient Spike Voltage Protection
  • Overtemperature Shut Down and Auto-Restart
  • UVLO Protection
  • High ESD Rating: HBM = 8kV, CDM = 1kV
  • Temperature Range:-40°C to +150°C
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1, 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AH3231Q-AH3234Q/AH3270Q-AH3272Q are suitable for automotive applications requiring specific change control; these parts are AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/



  • Position and proximity sensing in automotive applications
  • Seat positioning
  • Seatbelt buckles
  • Wiper positioning
  • Window lifters
  • Gear selection positioning

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Automotive
AEC Qualified Yes
Type Unipolar
Outputs Single
Output Type two-wire, current, Active High
Active Output State (B > Bop) 6mA
Inactive Output State (B < Brp) 14.5mA
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 20
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 45
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) 70
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 3
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 28
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) 53
Operating Ambient Temperature (°C) -40 to 150

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