A1130, A1131, and A1132: Two-Wire Unipolar Vertical Hall-Effect Switches with Advanced Diagnostics

The A1130, A1131, and A1132 are vertical Hall-effect sensor ICs developed in accordance with ISO 26262. The A113x devices have integrated continuous diagnostic features and a safe output state that supports a functional safety level of ASIL-B. These devices feature a two-wire current output interface that facilitates open/short diagnosis along with signal path verification from input to output. These are ideal sensors for safety-critical automotive applications, and can assist a system in meeting the most stringent safety requirements.

This family of unipolar Hall-effect switch ICs is sensitive to magnetic fields that are parallel to the surface of the package. These south pole sensitive switches are temperature stable and include automotive-grade ruggedness features such as reverse-battery protection, overvoltage protection, and load dump capability. Each device includes on a single silicon chip: a voltage regulator, diagnostic circuitry, a Hall-voltage generator, a small-signal amplifier, chopper stabilization, a Schmitt trigger, and an NMOS current output. The on-board regulator permits operation with supply voltages down to 3 V.

This family of devices is available in two package styles. The A1130, A1131, and A1132 in the LH package sense magnetic fields perpendicular to the non-leaded side of the package closest to pin 1.

The A1130 is additionally offered in the UA package, which offers magnetic field sensing either perpendicular to the top of the package (-Y option), or sensing perpendicular to the right side of the package closest to pin 3 (-X option).

ASIL LogoAllegro’s A1130, A1131, and A1132 are ASIL-B products that have been developed in accordance to ISO26262 and contain features targeted for automotive safety applications. This product can be used in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation can be provided to support and guide the integration process.



  • Brake and clutch pedal switches
  • Fluid float sensor
  • Seat belt buckles and position
  • Electronic Power Steering (EPS) index sensing
  • Hood/trunk latches
  • Electronic parking brakes

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

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  • ISO 26262 compliant
    • Achieves ASIL-B as a stand-alone component
    • A2-SIL™ documentation available including FMEDA and Safety Manual
    • Continuously operating background diagnostics
    • Integrated regulator undervoltage monitor
  • Magnetic sensing parallel to surface of package
  • Internal current regulator for two-wire operation
  • Highly sensitive unipolar switch thresholds
  • Operation down to 3 V
  • Selection of temperature coefficients (TC) to match magnet properties
  • Small package sizes, 3-pin SOT23W and SIP
  • Automotive-grade ruggedness
    • Qualified per AEC-Q100
    • Internal protection circuits enable 40 V load dump compliance
    • Operation up to 165°C junction temperature
    • Low temperature drift and high physical stress resistance
    • Solid-state reliability
    • Reverse-battery and overvoltage protection
A1130-1-2 Packages

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A1130-1-2 Product Image A1130-1-2 Block Diagram A1130-1-2 Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A1130LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1130LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1131ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1130LUA-X-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1130LUA-Y-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1132KLHLT-T 3-lead SOT -40°C to 125°C Yes View Data Contact your
local sales rep
Check 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.

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