A1266: Micropower Ultrasensitive 3D Hall-Effect Switch

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.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
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  • True 3D sensing
  • Omnipolar operation with either north or south pole
  • 2.5 to 5.5 V operation
  • Low supply current
  • High sensitivity, BOP 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

Click the image to view larger
Product Image Functional Block Diagram

Part Number Specifications and Availability

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

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