A1120, A1121, A1122, A1123, and A1125: Chopper-Stabilized Precision Hall-Effect Switches

The A1120, A1121, A1122, A1123, and A1125 Hall-effect, unipolar switches 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.

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-drain output to sink up to 25 mA.

An on-board regulator permits operation with supply voltages of 3 to 24 V. The advantage of operating down to 3 V is that the device can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high voltage transient events.

For the A1120, A1121, A1122, and A1123, a south pole of sufficient strength turns the output on. Removal of the magnetic field turns the output off. The A1125 is complementary, in that for these devices, a south pole turns the A1125 output off, and removal of the magnetic field turns the output on.

Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, –T), with a 100% matte tin plated leadframe.

SAMPLE & BUY
Arrow Electronics (Distributor, Allegro & Sanken Semiconductors)
25 Hub Drive
Melville, NY 11747
Phone: 1-800-777-2776 for local distributor
Web: www.arrow.com
Digi-Key Corporation (Distributor, Allegro & Sanken Semiconductors)
701 Brooks Avenue South
Thief River Falls, MN 56701
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.com

Digi-Key Corporation (Distributor, Allegro & Sanken Products)
701 Brooks Avenue South
Thief River Falls, MN 56701
United States
Phone: 800-344-4539 or 218-681-6674
Fax: 218-681-3380
Web: www.digikey.com
Email: webmaster@digikey.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
  • AEC-Q100 automotive qualified 
  • Unipolar switchpoints
  • Resistant to physical stress
  • Superior temperature stability
  • Output short-circuit protection
  • Operation from unregulated supply
  • Reverse-battery protection
  • Solid-state reliability
  • Small package sizes

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Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A1120ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1120ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1120EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1120LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1120LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1120LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1121ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1121ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1121EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1121LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1121LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1121LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1122ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1122ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1122EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1122LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1122LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1122LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1123ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1123ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1123EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1123LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1123LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1123LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1125ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1125ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1125EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1125LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1125LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1125LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock

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