A3250 and A3251 are field-programmable, chopper-stabilized, 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. A Zener clamp on the power supply protects against overvoltage conditions on the supply line. These devices also include short-circuit protection on the output.
The Allegro MicroSystems A3250 and A3251 are field-programmable, chopper-stabilized, unipolar Hall-effect switches designed specifically for use in high-temperature applications. These devices utilize a chopper-stabilization technique to eliminate offset inherent in single-element devices, ensuring stable switchpoints throughout the operating temperature range.
| Supply Voltage Range | 4.2 V to 24 V |
|---|---|
| Operating Temperature Range (E) | -40 to 85 °C |
| Operating Temperature Range (L) | -40 to 150 °C |
| Maximum Junction Temperature | 165 °C |
| Initial Operate Point (Bop) | -20 to 50 G |
| Programmable Bop Values | 50 to 2350 G |
The A3250 powers-on in the HIGH state.
The devices include protection against supply transients, output short-circuits, and reverse-battery conditions.