Asset Publisher

AS5247U - High Resolution Rotary Position Sensor

14-bit on-axis magnetic rotary position sensor with up to 14-bit binary incremental pulse count


  • DAEC ™ Dynamic angle error compensation DFS ™ Dynamic filter system
  • Magnetic stray field immunity
  • Developed according ISO26262, diagnostics, dual redundant chip version ASIL-D capable, Safety Element out of Context (SEooC)
  • AEC-Q100 Grade 0 qualified
  • Independent output interfaces: SPI, ABI, UVW, PWM


  • Easy to use – saving costs on DSP
  • Higher durability and lower system costs (no shield needed)
  • Enabler for safety critical applications
  • Suitable for automotive applications
  • Versatile choice of the interface

Product parameters

Resolution [bit] 14
Interface SPI
Output ABI, UVW, PWM
Max. Speed [rpm] 28.000
Overvoltage Protection
Redundant Yes
Supply Voltage [V] 3.3 - 5
Temperature Range [°C] -40 to 150
Package TQFP-32
Automotive Qualified Yes
Longevity Program January 2031

General description

The AS5247U is a high-resolution redundant rotary position sensor for fast absolute angle measurement over a full 360-degree range. This position sensor is equipped with a revolutionary integrated dynamic angle error compensation (DAEC™) with almost 0 latency at higher rotational speed. For increased signal quality at lower rotational speed, the dynamic filter system (DFS™) reduces transition noise.

The robust design of the device suppresses the influence of any homogenous external stray magnetic field. A standard 4-wire SPI serial interface with a CRC protection allows a host microcontroller to read 14-bit absolute angle position data from the AS5247U and to program non-volatile settings without a dedicated programmer. Incremental movements are indicated on a set of ABI signals with a maximum resolution of 16989 steps / 4096 pulses per revolution.
Brushless DC (BLDC) motors are controlled through a standard UVW commutation interface with a programmable number of pole pairs from 1 to 7. The absolute angle position is also provided as PWM-encoded output signal.

The AS5247U supports embedded self-diagnostics for fulfilling up to ASIL D in safety relevant applications. The device is using the ams stacked die technology in a TQFP-32 (7x7) package.

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:

  • BLDC motor communication
  • Electric power steering (EPS)
  • Transmission (gearbox, actuator)
  • Brake (actuator)
  • Starter/alternator


Title Category Headline Buy
SD4Y-PP Accessories Production Programmer SD4Y
USBI&PBox Accessories USB I&P Box for I2C/SPI

Technical documents

Type Description Language
Datasheet AS5147U_AS5247U Datasheet v1-07 English
Application Note Description of adaptive filter English
Application Note Dynamic Angle Error Compensation Description English
Application Note Zero Position Programming in Motor Control Application English
Application Note AN5000 Magnet Selection Guide v1-04 English
Application Note USB Interface & Programming Box English
User Guide User Guide Adapter Board AS5247U English
User Guide User Guide Socket Board AS5247U English

Environmental documents

Type Description Language
Material Declaration Form MDF_507940006_AS5247U-HTQT English
Material Declaration Form MDF_507940006_AS5247U-HTQT English
RoHS Certificate RoHS Certificate_AS5147U/AS5247U English


Type Description Language
EoL Notification AS5xxx, AS6204, AS8223 EoL Notification (issued August-10-2021) English

Other information

Type Description Language
Block Diagram Block Diagram AS5247U English
Factsheet Position Sensor ICs boost BLDC motor efficiency English
Factsheet Position Sensors Family Overview English
Image AS5247USocketBoard Image English
Image AS5247UAdapterBoard Image English
Asset Publisher

Related products