Two-Wire Hall Effect Switches with Self Diagnostics offer High Sensitivity and Stability Performance in Automotive Applications

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Diodes Incorporated introduces two new Switch ICs. The first one is two-wire unipolar (AH323xQ/4xQ) and the second one is latch (AH327xQ/8xQ). They provide high sensitivity and high stability over the operating temperature range. Both of them come with integrating self-diagnostics for monitoring the main device blocks, supply voltage, and temperature, the abnormal condition will be indicated by the third output state.




To provide superior stability of the magnetic operating and release points (BOP/BRP), it is given the advanced chopper-stabilized design. By coupling stability with a high ESD rating of 8kV, built-in reverse blocking diodes, and supply pin Zener clamp, we can meet the demanding requirements of automotive proximity/position sensing applications. The two-wire hall switches reduce the number of wires and thus reduce the system complexity and cost at the same time. Thus, improving robustness to electrical voice.


With a 2.7V to 27V operating voltage and -40˚C to +150˚C temperature range, the new ICs can be used in automotive proximity- and position-sensing applications, including seatbelt buckle, power window, gear selector, and seat position. The AH32xxQ devices come in the SC59 package and they are qualified to AEC-Q100, manufactured in IATF 16949 certified facilities, and support PPAP documentation. The AH324xQ and AH328xQ have a unit price starting at $0.40 in 3000 piece quantities, while the AH323xQ and AH327xQ start at $0.36 in 3000 piece quantities.


Features of AH323xQ/4xQ and AH327xQ/8xQ Switch ICs

  • 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)
  • High ESD Rating: HBM = 8kV, CDM = 1kV
  • Temperature Range: -40°C to +150°C


Note: More technical information can be found in the AH3231Q datasheet linked at the bottom of this page and on the AH323xQ/4xQ Switch IC and AH327xQ/8xQ Switch IC product pages.


Source: Components101




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