A1365: Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC with High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator


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, undervoltage 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 and the 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 output
voltage is user-adjustable around 50% (bidirectional) of the supply
voltage, VCC. The device sensitivity is adjustable within the range
of 0.6 to 14 mV/G.

The A1365 incorporates a highly sensitive Hall element with a
BiCMOS interface integrated circuit that employs temperature compensation
circuitry to reduce the intrinsic sensitivity and offset
drift of the Hall element. The IC also includes a small-signal high-gain
amplifier, a clamped low-impedance output stage, and a proprietary
high-bandwidth dynamic offset cancellation technique.

Device specifications apply across an extended 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. 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.

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A1365LLUTR-2P-T n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Distributor Stock
ASEK1365-T n/a -20°C to 85°C -- View Data Contact your
local sales rep
Distributor Stock
A1365LKTTN-1-T 4-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1365LKTTN-10-T 4-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1365LKTTN-2-T 4-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1365LKTTN-5-T 4-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.

Allegro 4 Pin SIP KT Package


 4-Pin SIP (suffix KT)


 KT Package .stp model

Design Support Tools

A1365 Software Portal

Frequently Asked Questions

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