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A1266: Micropower Ultrasensitive 3D Hall-Effect Switch

A1266 Datasheet

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Description

Top Features

The A1266 integrated circuit is an ultrasensitive Hall-effect switch with 3D omnipolar magnetic actuation. The single silicon chip includes: three Hall plates, multiplexer, small-signal amplifier, chopper stabilization, Schmitt trigger, and NMOS output transistors. The device outputs turn on when a magnetic field of sufficient strength is applied to the sensor in any orientation. Removal of the magnetic field will turn the output off.

Two versions of the A1266 offer a choice of output format: separate X, Y, and Z outputs, or a combined X+Y+Z output. The low operating supply voltage, 2.5 to 5.5 V, and unique clocking algorithm assist in reducing the average power consumption, making it ideal for battery operation (e.g., the power consumption is less than 25 μW with a 3.3 V supply).

The small geometries of the BiCMOS process allow for ultrasmall packages suitable for even space-constrained applications. In this case, a modified SOT23-W surface-mount package is available in a 3-pin (combined output) or a 5-pin (separate outputs) configuration, magnetically optimized for use in a variety of orientations. The packages are lead (Pb) free and RoHS-compliant, with 100% matte-tin leadframe plating.

True 3D sensing
Omnipolar operation with either north or south pole
2.5 to 5.5 V operation
Low supply current
High sensitivity, B_OP typically 25 G
Chopper-stabilized offset cancellation
- Superior temperature stability
- Extremely low switchpoint drift
- Insensitive to physical stress
Solid-state reliability
Choice of output format
- Separate X, Y, and Z outputs
- Combined (X+Y+Z) output
Tiny SOT-23 packages

Part Number Specifications and Availability

Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Samples	Check Stock
A1266ELHLT-SO3-T	3-lead SOT	-40°C to 85°C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1266ELHLT-T	5-lead SOT	-40°C to 85°C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1266ELHLX-SO3-T	3-lead SOT	-40°C to 85°C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1266ELHLX-T	5-lead SOT	-40°C to 85°C	Yes	View Data	Contact your local sales rep	Check Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

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Documentation & Resources

Guide

Hall-Effect IC Applications Guide

Allegro MicroSystems uses the latest integrated circuit technology in combination with the century-old Hall effect to produce Hall-effect ICs. These are contactless, magnetically activated switches and sensor ICs with the potential to simplify and improve electrical and mechanical systems.

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Application Note

Soldering Methods for Allegro Products (SMD and Through-Hole)

AN29006 - This document describes typical soldering methods that have been proven effective with Allegro™ products. It provides information on SMD (surface mount devices) and through-hole packages. Both lead (Pb) free and traditional Pb-based technologies are examined.

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Guide

Guidelines for Designing Subassemblies Using Hall-Effect Devices

This document covers most of the assembly methods used for mounting Hall-effect devices. In Allegro® Hall-effect devices, the signal is conditioned and optimized for various types of magnetic inputs to produce a suitable electrical output.

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Guide

Allegro Product Selection Guide

Sense. Regulate. Drive. Check out our device offerings and packages across all of our product families in this PDF selection guide.

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Application Note

Handling, Storage, and Shelf Life of Semiconductor Devices

Electronic devices are available in many package types and can contain semiconductors (integrated circuits), magnets, capacitors, and resistors. This application note provides guidelines for the handling and storage of Allegro devices with regards to functionality and shelf life. Precautions ...

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Application Note

Allegro Microsystems - Chemical Exposure of Devices

This application note discusses the types of situations and applications that can give rise to failure of the device from corrosion.

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Application Note

Allegro Hall-Effect Sensor ICs

This note provides a basic understanding of the Hall effect and how Allegro designs and implements Hall technology in packaged semiconductor monolithic integrated circuits.

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Technical Article

Integrating Hall-Effect Magnetic Sensing Technology into Modern Household Appliances

As technology improves, Hall-effect sensor ICs are finding their way into many modern household appliances. The Hall effect refers to the measurable voltage that appears across a conductive material.

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Application Note

Omnipolar Switch Hall-Effect IC Basics

There are four general categories of Hall-effect IC devices that provide a digital output: unipolar switches, bipolar switches, omnipolar switches, and latches. Omnipolar switches are described in this application note.

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