ATS17501: Dual Output Differential Speed and Direction Sensor IC


The ATS17501 is a single IC solution designed for rotational position sensing of a ferrous gear target found in automotive and industrial electric motor applications (often with specific application and safety requirements). The IC is housed in an SG package that incorporates a rare-earth magnetic pellet for ease of manufacturing, consistent application performance over temperature, and enhanced reliability.

Three Hall elements are incorporated to create two independent differential channels. These inputs are processed by digital circuits and robust algorithms designed to eliminate the detrimental effects of magnetic and system offsets, and to address false output transitions caused by target vibrations in electric motors at startup and low speed operation. The differential signals are used to produce a highly accurate speed output and, if desired, provide information on the direction of rotation.

Advanced calibration techniques are used to optimize signal offset and amplitude. This calibration, combined with the digital tracking of the signal, results in accurate switch points over air gap, speed, and temperature.

The IC can be programmed for a variety of applications requiring dual-phase gear speed and position signal information or simultaneous high-resolution gear speed and direction information. It can be configured to enable Fault Detection mode for ASIL B(D) utilization.

The ATS17501 SG package is a lead (Pb) free 4-pin SIP package with an integrated back-biasing magnet and a 100% matte-tin-plated lead frame.

Top Features

  • High-speed switching bandwidth up to 40 kHz
  • Two independent output channels with options for high resolution XOR speed, pulse, and direction protocol
  • ASIL B(D) compliant (ISO 26262)
  • Optional fault detection output protocol
  • Immune to common external magnetic disturbance
  • EEPROM enables factory traceability throughout product life cycle

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A17501POKA-SDFUYJE 4-lead SIP -40°C to 160°C -- View Data New Contact your
local sales rep
Distributor Stock
ATS17501PSGATN-SDFUYJ 4-lead SIP -40°C to 160°C -- View Data Contact your
local sales rep
Distributor Stock
ATS17501PSGATN-VDFUYJ 4-lead SIP -40°C to 160°C -- View Data Contact your
local sales rep
Distributor Stock
ATS17501PSGATN-WDFUYJ 4-lead SIP -40°C to 160°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.

Allegro SG Package Image


4-Pin SIP (suffix SG)