Allegro MicroSystems A1146
the A1146 switches HIGH in the presence of a south (+) polarity magnetic field of sufficient strength, and switches LOW otherwise, as in the presence of a weak field or a north (–) polarity field. The A1145 has an opposite output: the currents switch LOW in the presence of a south-polarity magnetic field of sufficient strength, and switch HIGH otherwise. Both versions are offered in two package styles.| Part No. | A1146 |
|---|---|
| Datasheet | A1146 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress● Factory programmed at end-of-line for optimized switchpoints
● On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage regulator ▫ 3.5 to 24 V operation Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA)
DESCRIPTION
The A1145 and A1146 devices are two-wire, unipolar, Hall effect switches that are factory-programmed at end-of-line to optimize ultrasensitive magnetic switchpoint accuracy. These devices use a high frequency chopper-stabilization technique, produced using the Allegro advanced BiCMOS wafer fabrication process, to achieve magnetic stability and to eliminate offset inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, these switches are utilized in sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position.
