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High-Performance Power and Hall-Effect Sensor ICs

A3280, A3281, and A3283
Chopper-Stabilized, Precision Hall-Effect Latches

Pin-Out or Package

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 This classification indicates that the product is obsolete and notice has been given.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

Functional Block Diagram

Complete Part Numbers
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.

Copyright © 2010 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Worcester, MA 01606 USA Phone: 1.508.853.5000 Fax: 1.508.853.7895