ATS625LSG: True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor IC


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: October 31, 2011.

Our next generation recommended substitutes are:

For the ATS625LSGTN-T, we recommend the ATS627LSGTN-T.

The ATS625 true zero-speed gear tooth sensor IC is an optimized Hall IC and rare earth pellet configuration that provides a manufacturer-friendly solution for digital gear tooth sensing applications. The over-molded package holds together a samarium cobalt pellet, a pole piece concentrator, and a true zero-speed Hall IC that has been optimized to the magnetic circuit. This small package can be assembled simply and used in conjunction with gears of various shapes and sizes.

The device incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by a ferrous target. Digital processing of the analog signal provides zerospeed performance independent of air gap as well as dynamic adaptation of device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). High-resolution peak detecting DACs are used to set the adaptive switching thresholds of the device. Switchpoint hysteresis reduces the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications. This device is optimized for crank applications that utilize targets that possess signature regions.

The ATS625 is provided in a 4-pin SIP. It is lead (Pb) free, with 100% matte tin plated leadframe.

Top Features

  • Highly repeatable over operating temperature range
  • Tight timing accuracy over operating temperature range
  • True zero-speed operation
  • Air-gap–independent switchpoints
  • Vibration immunity
  • Large operating air gaps
  • Defined power-on state
  • Wide operating voltage range
  • Digital output representing target profile
  • Single-chip sensing IC for high reliability
  • Small mechanical size
  • Optimized Hall IC magnetic system
  • Fast start-up
  • AGC and reference adjust circuit
  • Undervoltage lockout

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ATS625LSGTN-T 4-lead SIP -40°C to 150°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 ATS625 is provided in a 4-pin SIP. It is lead (Pb) free, with 100% matte tin plated leadframe.

SG SIP 4 pin