A1126: Chopper-Stabilized Omnipolar Hall-Effect Switch

Description

The A1126 integrated circuit is an omnipolar, ultrasensitive Hall-effect switch with a digital output. This device has an integrated regulator permitting operation to 24 V.

This device is especially suited for operation through extended temperature ranges, up to 150°C. Superior high-temperature performance is made possible through an Allegro patented dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.

The A1126 Hall-effect switch includes the following on a single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short circuit protected open-drain output. Advanced BiCMOS wafer fabrication processing is used to take advantage of low-voltage requirements, component matching, very low input-offset errors, and small component geometries.

The omnipolar operation of the A1126 allows activation with either a north or a south polarity field of sufficient strength. In the absence of a magnetic field, the output is off. This patented magnetic-polarity-independence feature makes this device an excellent replacement for reed switches, with improved ease of manufacturing, because the A1126 does not require manufacturers to orient their magnets. These devices allow simple on/off switching in industrial, consumer, and automotive applications.

The A1126 is rated for operation between the ambient temperatures –40°C to 150°C. The available package styles provide magnetically optimized solutions for most applications. Package LH is an SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultramini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte-tin-plated leadframe.

Top Features

  • AEC-Q100 automotive qualified 
  • Omnipolar operation
  • High speed, 4-phase chopper stabilization
    • Low switchpoint drift
    • Superior temperature stability
  • Insensitive to physical stress
  • Reverse-battery protection
  • Robust EMC capability
  • Robust ESD

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A1126LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1126LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1126LUA-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.

Packaging

The A1126 package styles provide magnetically optimized solutions for most applications. Package LH is an SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultra-mini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte-tin-plated leadframe.

 

Packages