A3161: Hall-Effect Switch for Two-Wire Applications

These parts are discontinued.  Samples are no longer available. For new customers or new applications, please refer to Allegro A1150 Series.

This Hall-effect switch is a monolithic integrated circuit designed to operate continuously over extended temperatures to +85°C. The unipolar switching characteristic makes this device ideal for use with a simple bar or rod magnet. The A3161ELT and A3161EUA are identical except for package.

Each device includes a voltage regulator for operation with supply voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal amplifier, Schmitt trigger, and a constant-current open-collector output. Noise radiation is limited by control of the output current slew rate.


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

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Internal Current Regulator for 2-Wire Operation
  • Output Slew Rate Controlled
  • 3.5 V to 25 V Operation ... Needs Only An Unregulated Supply
  • Reverse Battery Protection
  • Excellent Temp. Stability
  • Activate with Small, Commercially Available Permanent Magnets
  • Small Size
  • Solid-State Reliability ... No Moving Parts
  • Resistant to Physical Stress
Pinout Diagram

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Functional Block Diagram Pinout Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A3161ELT 3-lead SOT -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A3161ELTTR 3-lead SOT -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A3161EUA 3-lead SIP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock

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