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AS5172A-B 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 (AS5172B) AEC-Q100 Grade 1 qualified (AS5172A)
  • System cost reduction – no PCB and additional components are needed


  • 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
  • SIP Package (System-in-Package)

Product parameters

Resolution [bit] 14 or 12
Interfaces PSI5
Output UART-over-PSI5
Max. Speed [rpm]
Overvoltage Protection Yes
Supply Voltage [V] 4.0 to 12.0
Temperature Range [°C] AS5172A: -40 to +125 / AS5172B: -40 to +150
Package AS5172A: SiP (system in package) / AS5172B: TSSOP
Automotive Qualified Yes

General Description

The AS5172 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 AS5172 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.

Magnets cannot be ordered at ams directly. Please find a list of recommended 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

Name Type Description Version Language
PositionSensors_AN000304_1-00.pdf Application Note Tape & Reel Packing Information 1-00 English
AS5172_BD000227_1-00.png Block Diagram AS5172 Block Diagram 1-00 English
AS5172A-B_DS000516_5-00.pdf Datasheet Document version 1-05 5-00 English
PositionSensors_FS000210_1-00.pdf Factsheet Accurate Position Sensing in demanding Automotive Applications 1-00 English
AS5172A-B_PD000399_1-00.jpg Other Product Document AS5172AdapterBoard Image 1-00 English
AS5172_RC000139_1-00.pdf RoHS Certificate RoHS Certificate AS5172A/B/C 1-00 English
AS5172A-B_UG000356_2-00.pdf User Guide AS5172 Adapterboard Operation Manual 2-00 English
AS5xxx_UG000386_1-00.pdf User Guide AS5xxx Rotary Magnet Holder 1-00 English

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