Hall-Effect Sensor ICs

Allegro's Hall-effect sensor ICs are temperature-stable and stress-resistant

Image of Allegro's Hall-Effect Sensor ICsAllegro's A1220, A1221, and A1222 Hall-effect sensor ICs are extremely temperature-stable and stress-resistant devices. They are especially suited for operation over extended temperature ranges up to 150°C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.

On a single silicon chip, each device includes a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output to sink up to 25 mA. A south pole of sufficient strength turns the output on. A north pole of sufficient strength is necessary to turn the output off.

An onboard regulator permits operation with supply voltages of 3 V to 24 V. The advantage of operating down to 3 V is that the device can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high voltage transient events.

  • Symmetrical latch switchpoints
  • Resistant to physical stress
  • Superior temperature stability
  • Solid-state reliability
  • Output short-circuit protection
  • Operation from unregulated supply down to 3V
  • Reverse battery protection


ImageManufacturer Part NumberDescriptionFunctionTechnologyAvailable Quantity
A1220ELHLT-T datasheet linkIC LATCH BIPOLAR 3V SOT23WA1220ELHLT-TIC LATCH BIPOLAR 3V SOT23WLatchHall Effect10115 - Immediate
A1220ELHLT-T product page link
A1220LLHLT-T datasheet linkIC LATCH BIPOLAR 3V SOT23WA1220LLHLT-TIC LATCH BIPOLAR 3V SOT23WLatchHall Effect14841 - Immediate
A1220LLHLT-T product page link
A1221ELHLT-T datasheet linkIC LATCH BIPOLAR 3V SOT23WA1221ELHLT-TIC LATCH BIPOLAR 3V SOT23WLatchHall Effect9132 - Immediate
A1221ELHLT-T product page link
A1221LLHLT-T datasheet linkIC LATCH BIPOLAR 3V SOT23WA1221LLHLT-TIC LATCH BIPOLAR 3V SOT23WLatchHall Effect8223 - Immediate
A1221LLHLT-T product page link
A1222LLHLT-T datasheet linkIC HALL EFFECT LATCH SOT23WA1222LLHLT-TIC HALL EFFECT LATCH SOT23WLatchHall Effect5374 - Immediate
A1222LLHLT-T product page link
Published: 2013-07-02