A1160: Chopper-Stabilized Precision Hall-Effect Switch With Advanced Diagnostics

The A1160 is a unipolar, Hall-effect switch with an externally enabled diagnostic function. In normal operating mode, the A1160 functions as a standard, unipolar Hall-effect switch. The output transistor turns on (output signal switches low) in the presence of a sufficient magnetic field (>BOP(max)). Additionally, the output transistor of the A1160 switches off (output signal switches high) when the magnetic field is removed (<BRP(min)).

The A1160 includes conductive coils in close proximity to the Hall element. When the diagnostic feature is enabled, these coils are energized. The energized coils generate an internal magnetic field that can be sensed by the Hall element. While in Diagnostic mode, the output of the A1160 provides a square wave output, which confirms the IC is properly sensing the internally generated magnetic field. The Diagnostic mode exercises the entire magnetic and electrical signal path internal to the IC, fully confirming functionality. Therefore, use of the A1160 either eliminates the need for redundant sensors in safety critical applications or increases robustness in safety critical applications that require redundant sensors (drive-by-wire systems and so forth).

The A1160 Hall-effect sensor IC is extremely temperature-stable and stress-resistant, especially suited for operation at temperature ranges up to 150°C. Superior high-temperature performance is made possible through advanced dynamic offset cancellation techniques, which reduce the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. This device includes, on a single silicon chip: a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a open-drain output able to sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3.8 to 24 V.

The A1160 is provided in a 5-pin SOT23W. The package is lead (Pb) free, with 100% matte-tin leadframe plating.

ASIL LogoAllegro's A1160 is a Quality Managed (QM) product that has been developed according to the automotive quality requirements of TS 16949 and contains features targeted for automotive safety applications. This product can be qualified for use in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation will be provided to support and guide the integration process.


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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  • AEC-Q100 automotive qualified 
  • Unipolar switchpoints
  • Externally enabled diagnostics feature
  • Diagnostics feature exercises the entire magnetic and electrical signal path within the IC
  • Resistant to physical stress
  • Superior temperature stability through advanced chopper stabilization techniques
  • Output short-circuit protection
  • Internal regulator enables operation from unregulated supplies
  • Reverse-battery protection
  • Solid-state reliability
  • Small surface-mount package

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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
A1160LLHLX-T 5-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
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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.

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