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

Product Image

Description

Top Features

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.

Allegro MicroSystems recommends the APS11200 for new Automotive 3-wire Hall-Effect switch IC designs.

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A1120ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1120ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1120EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1120LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1120LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1120LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1121LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122ELHLU-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122LLHLU-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1122LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1123LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125ELHLX-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1125LUA-T 3-lead SIP -40°C to 150°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.

hall-effect switches packaging

Packaging

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.

LH Package Documentation

UA Package Documentation