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AS5172B High Resolution Position Sensor

High-resolution on-axis magnetic angular position sensor with PSI5 output


  • 12-bit resolution @90° minimum arc
  • Low output noise, low inherent INL
  • Magnetic stray field immunity
  • Functional safety, diagnostics
  • AEC-Q100 Grade 0 qualified


  • Resolve small angular excursion with high accuracy
  • Accurate angle measurement
  • Higher durability and lower system costs (no shield needed)
  • Enabler for safety critical applications
  • Suitable for automotive applications

Product parameters

Resolution [bit] 14 or 12
Interface PSI5
Output UART-over-PSI5
Max. Speed [rpm]
Overvoltage Protection Yes
Supply Voltage [V] 4.0 to 12.0
Temperature Range [°C] -40 to +150
Package TSSOP
Automotive Qualified Yes
Longevity Program January 2031

General description

The AS5172B is a magnetic position sensor with a high-resolution 12-bit PSI5 output according PSI5 specification Version 1.3 and 2.1.

Based on a Hall sensor technology, this device measures the orthogonal component of the flux density (Bz) over a full-turn rotation and compensates for external stray magnetic fields with a robust architecture based on a 14-bit sensor array and analog front-end (AFE). A sub-range can programmed to achieve the best resolution for the application. To measure the angle, only a simple two-pole magnet rotating over the center of the package is required. The magnet may be placed above or below the device. The absolute angle measurement provides an instant indication of the magnet’s angular position. The AS5172B operates up to a voltage of 16.5V and is protected against overvoltage up to +20V. In addition, the supply pins are protected against reverse polarity up to – 18V.

With two decades of magnetic sensor system know-how, we have broad experience in selecting the most suitable magnets. ams experts recommend the following magnet suppliers.

This product suits for the following applications:

  • Brake and Gas Pedals
  • Throttle Valve and Tumble Flaps
  • Steering Angle Sensors
  • Chassis Ride
  • EGR
  • Fuel-Level Measurement Systems
  • 2/4WD Switch
  • Contactless Potentiometers


Title Category Headline Buy
RMH05-DK-XX Accessories Rotary Magnetic Holder

Technical documents

Type Description Language
Datasheet AS5172A_AS5172B_Datasheet_v1-07 English
Application Note AN5000 Magnet Selection Guide v1-04 English
Application Note Tape & Reel Packing Information English
User Guide AS5172 Adapterboard Operation Manual English

Environmental documents

Type Description Language
RoHS Certificate RoHS Certificate AS5172A/B/C English


Type Description Language
Product Change Notification PCN38-2018 (AS50xx, AS51xx, AS52xx, AS54xx, AS8xxx) English

Other information

Type Description Language
Block Diagram AS5172 Block Diagram English
Factsheet Position Sensors Family Overview English
Image AS5172AdapterBoard Image English
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