A1377: Highly Programmable Linear Hall-Effect Sensor IC


The Allegro™ A1377 programmable linear Hall-effect sensor IC is designed for applications that require high accuracy and high resolution without compromising bandwidth. The A1377 employs segmented, linearly interpolated temperature compensation technology. This improvement greatly reduces the total error of the device across the whole temperature range. As a result, the device is ideally suited for sensing in numerous automotive applications, such as linear and rotary position sensors in actuators and valves.

Available in a through-hole, small form factor, single in-line package (SIP), the A1377 Hall-effect sensor IC has a broad range of sensitivity and offset operating bandwidth. The accuracy and flexibility of this device is enhanced with user programmability, via the VCC and output pins, which allows the device to be optimized in the application.

This ratiometric Hall-effect sensor IC provides a voltage output that is proportional to the applied magnetic field. The quiescent voltage output (QVO) is user-adjustable from approximately 5% to 95% of the supply voltage. The device sensitivity is adjustable within the range of 1 to 14 mV/G.

The features of this linear device make it ideal for use in automotive and industrial applications requiring high accuracy, and apply across an extended temperature range, from –40°C to 150°C.Each BiCMOS monolithic circuit integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage and a proprietary dynamic offset cancellation technique.

The A1377 sensor is provided in a 3-pin single in-line package (UC suffix) with bypass capacitors integrated into the package. It is lead (PB) free, with 100% matte-tin leadframe plating.

Top Features

  • On-board diagnostics
    • Broken ground detection
    • VCC undervoltage detection
    • VCC overvoltage detection
  • Customer-programmable offset, sensitivity, polarity, and output clamps
  • Integrated power supply and output bypass capacitors
  • Customer and factory access code for enhanced reliability
    • Factory code required for write access to TC trim and other factory registers
    • Customer code required for write access to customer
  • Temperature-stable quiescent voltage output and sensitivity: sensitivity temperature coefficient (TC) and QVO temperature coefficient programmed at Allegro for improved accuracy
  • Optional output voltage clamps provide short-circuit diagnostic capabilities
  • Wide ambient temperature range: –40°C to 150°C
  • Enhanced EMC performance for stringent automotive applications
  • Allegro Sensor Bias LDO

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ASEK-1377-SUBKIT-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
ASEK-1377-T-KIT DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A1377LUCLU-TC1-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1377LUCLU-TC3-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
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.