Automotive bipolar latch boosts magnetic sensitivity
An automotive bipolar Hall-effect latch from Diodes, the AH3711Q provides high magnetic sensitivity with operate and release points of ±10 Gauss. It can be used for brushless DC motor control, rotational speed measurement, linear and incremental rotary encoders, and position sensing. Typical applications include tailgate opening and closing mechanisms, motorized sunroofs, and power windows.
The high sensitivity of the AH3711Q enables detection of weaker magnetic fields, allowing the use of smaller magnets to reduce system size and BOM cost. Increased magnetic margin also permits greater duty-cycle reduction, lowering power consumption and extending battery life.
Operating over a 3-V to 27-V range, the Hall-effect latch integrates a reverse-blocking diode and Zener clamp on the supply, while the output includes overcurrent limiting and a Zener clamp. A chopper-stabilized design minimizes switch-point drift across the full -40°C to +150°C temperature range. These features protect against 40-V load dumps, reverse polarity, and short circuits. High 8-kV HBM and 1-kV CDM ESD ratings further enhance robustness in harsh environments.
The AEC-Q100 qualified AH3711Q is priced at $0.20 in 2,000-piece quantities.
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