A1693: Vibration-Tolerant Hall-Effect Transmission Speed and Direction Sensor IC


The A1693 is a magnetic sensor IC designed for measuring the speed and direction of rotating transmission systems. This IC can directly measure ring magnets or be back-biased with a magnet to measure ferrous targets.

The IC incorporates three Hall-effect elements that sense differentially, analog signal conditioning with dynamic gain and offset adjustment, analog-to-digital converters (ADCs), and a digital processor that applies intelligent algorithms to prevent the output from switching when the sensed target vibrates.

The A1693 output is an open collector that requires a pull-up resistor. Each time a new magnetic state is detected, the output goes low for a pulse-width time that communicates a forward-direction, reverse-direction, or non-direction.

The sensor IC is AEC-Q100 qualified for automotive applications, and is provided in a lead (Pb) free 4-pin single inline package (SIP) with 100% matte tin leadframe plating.

For applications that require an integrated magnet for gear tooth sensing, please see the ATS693.  For applications that require a 2-wire speed and direction transmission sensor, please see the A19520.

Top Features

  • Differential Hall-effect sensor IC measures ring magnets and ferrous targets with inherent stray field immunity
  • Vibration detection algorithms prevent false switching and provide low-signal lockout
  • Large operating air gap with independent switch points
  • Three-wire pulse-width output protocol describes speed and direction
  • Wide operating voltage and integrated protection circuits
  • AEC-Q100 Grade 0 qualified for an ambient operating temperature range of –40°C to 150°C

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A1693LKTN-RSNOBH-T 4-lead SIP -40°C to 150°C -- 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.


A1693 4-Pin K Package