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Two-Wire Automotive Hall Effect Latch Switches

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The AH3231Q, AH3232Q, AH3233Q, AH3270Q, AH3271Q, and 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 AH3231Q, AH3232Q, and AH3233Q 2-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 AH3270Q, AH3271Q, and AH3272Q 2-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).


  • Position and Proximity Sensing in Automotive Applications
  • Seat positions
  • Seatbelt buckles
  • Wiper positions
  • Window lifters
  • Gear selection positions


  • Unipolar: AH3231Q, AH3232Q, AH3233Q
  • Latch: AH3270Q, AH3271Q, AH3272Q
  • Output Polarity:
    • Direct: AH3232Q, AH3233Q
    • Inverted: AH3231Q
  • Wide Supply Voltage Operation: 2.7V to 27V
  • Temperature Coefficient -1100ppm/°C (AH3232Q, AH3233Q)
  • Chopper Stabilized Design Provides:
    • Superior Temperature Stability
    • Minimal Switch Point Drift
    • Enhanced Immunity to Stress
  • Battery polarity reverse connection protection
  • Transient Spike Voltage Protection
  • Over-Temperature 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 
  • Halogen- and Antimony-Free. “Green” Device 
  • The AH3231Q, AH3232Q, AH3233Q, AH3270Q, AH3271Q,
    and AH3272Q are suitable for automotive applications
    requiring specific change control; these parts are AECQ100 qualified, PPAP capable, and manufactured in IATF
    16949 certified facilities.

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Yes
Output Type Current
Operating Voltage 2.2 to 27 V
Average Supply Current N/A mA
Output Current Capability N/A mA
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Min) 10
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Typ) 30
Operating Point Bop (Bops +ve/ Bopn -ve) Gauss (Max) 50
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Min) -50
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Typ) -30
Release Point Brp (Brps +ve/Brpn -ve) Gauss (Max) -10
Operating Ambient Temperature -40 to 125 °C

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