Allegro MicroSystems A3251
the A3251 has the opposite polarity, switching HIGH in a southpolarity magnetic field that BOP , and switching LOW when the field drops below BRP . The other differences in the devices are the power-on state. The A3250 powers-on in the HIGH state, while the A3251 powers-on in the LOW state.| Part No. | A3251 |
|---|---|
| Datasheet | A3251 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Chopper-Stabilized Unipolar Hall-Effect Switches |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● Chopper stabilization for stable switchpoints throughout operating temperature range● Externally programmable operate point (through VCC pin)
● On-board voltage regulator for 4.2 V to 24 V operation
● On-chip protection against: ▫ Supply transients ▫ Output short-circuits ▫ Reverse-battery condition
DESCRIPTION
The A3250 and A3251 are field-programmable, chopperstabilized, unipolar Hall-effect switches designed for use in high-temperature applications. These devices use a chopper-stabilization technique to eliminate offset inherent in single-element devices. The A3250 and A3251 are externally programmable devices. The devices have a wide range of programmability of the magnetic operate point (BOP) while the hysteresis remains fixed. This advanced feature allows for optimization of the sensor switchpoint and can drastically reduce the effects of variations found in a production environment, such as magnet and device placement tolerances. These devices provide on-chip transient protection.
