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Datasheets:
A3280, A3281, and A3283: Chopper-Stabilized, Precision Hall-Effect Latches (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Hall-Effect Digital Latches
Technical Publications:
Chopper-Stabilized Amplifiers With a Track-and-Hold Signal Demodulator,
Latching Switch Hall-Effect IC Basics,
Ring Magnet Speed Sensing for Electronic Power Steering,
Monolithic Magnetic Hall Sensor ICs Using Dynamic Quadrature Offset Cancellation
FAQs:
Digital Hall-Effect Sensor ICs FAQ
Press Releases:
Allegro Releases New Family of Chopper-Stabilized Precision, Hall-Effect Sensor ICs
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A3280, A3281, and A3283
Chopper-Stabilized, Precision Hall-Effect Latches
The A3280 and A3281 are obsolete and no longer in production.
Date of status change: May 3, 2010
The A3283 part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.
Date of status change: August 16, 2010.
Deadline for receipt of LAST TIME BUY orders: October 29, 2010.
Our next generation recommended substitutes are:
| Device | BOP | BRP | Hys | ||||
|---|---|---|---|---|---|---|---|
| Legacy | Replacement | Min | Max | Min | Max | Min | Max |
| A3280 | A1222 | 5 | 40 | -40 | -5 | 10 | 80 |
| A3281 | A1222 | 15 | 90 | -15 | -90 | 30 | 180 |
| A3283 | A1223 | 100 | 180 | -100 | -180 | 200 | 360 |
Features
- Symmetrical switch points
- Resistant to physical stress
- Superior temperature stability
- Output short-circuit protection
- Operation from unregulated supply
- Reverse battery protection
- Solid-state reliability
- Small size
Description
The A3280, A3281, and A3283 Hall-effect latches are extremely temperature-stable and stress-resistant sensor ICs especially suited for operation over extended temperature ranges 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. The three devices are identical except for magnetic switch points.
Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts.
Three package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W surface-mount package, LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while UA is a three-lead ultra-mini-SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, –T), with 100% matte tin leadframe plating.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3283ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283ELTTR-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283LLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283LLTTR-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3283LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
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.