A1354: High Precision 2-Wire Linear Hall Effect Sensor IC with Pulse Width Modulated Output


This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.

Date of status change: April 30, 2012.

Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A1354 device is a high precision, programmable 2-wire Hall effect linear sensor IC with a pulse width modulated (PWM) output. The duty cycle (D) of the PWM output signal is proportional to the applied magnetic field. The A1354 device converts an analog signal from its internal Hall circuit to a digitally encoded PWM output signal. The coupled noise immunity of the digitally encoded PWM output is far superior to the noise immunity of an analog output signal.

The BiCMOS, monolithic circuit inside of the A1354 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. Hall element offset is normally caused by device overmolding, temperature dependencies, and thermal stress. The high frequency offset cancellation (chopping) clock allows a greater sampling rate, which increases the accuracy of the output signal and results in faster signal processing capability.

Top Features

  • Designed for automotive, battery-powered applications
  • Customer programmable quiescent duty cycle, sensitivity, and PWM carrier frequency, through VCC pin
  • Simultaneous programming of duty cycle, sensitivity, and PWM carrier frequency, for system optimization
  • Factory programmed sensitivity temperature coefficient and quiescent duty cycle drift
  • Selectable unidirectional or bidirectional quiescent duty cycles
  • Pulse width modulated (PWM) output provides increased noise immunity compared to analog output
  • Temperature-stable quiescent duty cycle output and sensitivity
  • Output duty cycle clamps provide short circuit diagnostic capabilities
  • Optional 50% duty cycle calibration test mode at device power-up
  • Wide ambient temperature range: –40°C to 125°C
  • Resistant to mechanical stress
  • Extremely thin package: 1 mm case thickness

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A1354KKTTN-T 4-lead SIP -40°C to 125°C Yes View Data Discontinued 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.


The A1354 device is provided in a lead (Pb) free 4-pin single inline package (KT suffix), with 100% matte tin leadframe plating.


 KT SIP 4 pin