Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC with High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator


Allegro 4 Pin SIP KT Package


Top Features


The A1365 linear output Hall-effect sensor IC is specifically designed to provide a highly accurate output with improved resolution at high bandwidth for use in current-sensing applications. This device employs a segmented, linearly interpolated temperature compensation technology, which provides greater accuracy in sensitivity and offset voltage trimming and hence virtually zero temperature drift. This improvement greatly reduces the total error of the device across the operating temperature range.

The highly programmable Over Field Fault signal (FAULT pin) can be used to detect a high magnetic field condition. Broken ground wire detection, under voltage lockout for VCC below specification, and user-selectable output voltage clamps are also included, which are important for high reliability in automotive applications. The sensor accuracy and diagnostic capability make it ideally suited for automotive sockets such as HEV inverter and DC-to-DC converter applications.

The A1365 Hall-effect sensor IC is extremely sensitive, fast, and temperature-stable. The accuracy and flexibility of this device is enhanced by user programmability, performed via the VCC supply an  the output pins, which allows the device to be optimized in the application.

The A1365 sensor IC is provided in an extremely thin case (1 mm thick), 4-pin SIP (single inline package, suffix KT) that is lead (Pb) free, with 100% matte-tin leadframe plating. The thin package allows for better magnetic coupling because the smaller the air gap in the core is, the higher the coupling from current to magnetic field will be.

  • Proprietary segmented linear temperature compensation (TC) technology provides a typical accuracy of 1% over the full operating temperature range
  • Self-Test diagnostic mode can be used to achieve a high level of functional safety within a system
  • 120 kHz nominal bandwidth achieved via proprietary packaging and chopper stabilization techniques
  • Over Field Fault signal with 6-bit programmable trigger levels, 2-bit programmable hysteresis, and latching or non-latching behavior
  • Over Field Fault response time < 4.5 μs (typ)
  • Extremely low noise and high resolution achieved via proprietary Hall element and low-noise amplifier circuits
  • Customer-programmable, high-resolution offset and sensitivity trim
  • Available in a 1-mm-thick SIP through-hole package
  • Factory-programmed sensitivity and quiescent output voltage TC with extremely stable temperature performance
  • Selectable sensitivity range between 0.6 and 14 mV/G through use of coarse sensitivity program bits
  • Ratiometric sensitivity, quiescent voltage output, and clamps enable simple interface with application A-to-D converter (ADC)
  • Output voltage clamps provide short-circuit diagnostic capabilities
  • Open-circuit detection on ground pin (broken wire)
  • Undervoltage lockout for VCC below specification
  • Wide ambient temperature range: –40°C to 150°C

The A1365 sensor IC is provided in an extremely thin case (1 mm thick), 4-pin SIP (single inline package, suffix KT) that is lead (Pb) free, with 100% matte-tin leadframe plating.

KT Package Documentation

Part Number Specifications and Availability

Documentation and Resources


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Core Design for Field DC Current Sensors
Simulation Tool
Current Sensor Error and Resolution
ACS LTspice Library