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High-Performance Power ICs and Hall-Effect Sensors
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Datasheets:
A3290 and A3291: Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications (PDF)
Selection Guides:
Hall-Effect Sensors,
Hall-Effect Digital Latches
Press Releases:
A3290 and A3291: Allegro MicroSystems, Inc. Announces New General-Purpose Latches For Non-Automotive Applications
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A3290 and A3291
Chopper Stabilized, Precision Hall Effect Latches for Consumer and
Industrial Applications
Features
- Symmetrical switchpoints
- Resistant to physical stress
- Superior temperature stability
- Output short-circuit protection
- Operation from unregulated supply
- Reverse battery protection
- Solid-state reliability
- Small package size
Description
The A3290 and A3291 Hall effect latches are extremely temperature-stable and stress-resistant sensors, especially suited for operation over extended temperature ranges (up to 125°C). Superior high-temperature performance is made possible through Dynamic Offset Cancellation, which reduces the residual offset voltage normally caused by device package overmolding, temperature dependencies, and thermal stress. The two devices are identical except for their magnetic switchpoints. They are not intended for automotive applications.
Both devices include, on a single silicon chip, a voltage regulator, a Hall-voltage generator, a small-signal amplifier, chopper stabilization, a Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south polarity magnetic field of sufficient strength is required to turn the output on. A north polarity field of sufficient strength is necessary to turn the output off. An onboard regulator permits operation with supply voltages in the range of 4.2 to 24 volts.
Two package styles provide a magnetically optimized package for most applications. Type LH is a miniature SOT23W low-profile surface-mount package, and type UA is a three-pin ultramini SIP for through-hole mounting. Both packages are lead (Pb) free with 100% matte tin leadframe plating.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3290KLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 125 °C | new | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3290KUA-T | 3-pin SIP | Yes | view data | -40 °C to 125 °C | new | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3291KLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 125 °C | new | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. | |
| A3291KUA-T | 3-pin SIP | Yes | view data | -40 °C to 125 °C | new | Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor. |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.