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AS5147U - 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
Interfaces SPI
Output ABI, UVW, PWM
Max. Speed [rpm] 28000
Overvoltage Protection -
Redundant No
Supply Voltage [V] 3.3 - 5
Temperature Range [°C] -40 to 150
Package TSSOP-14
Automotive Qualified Yes

General Description

The AS5147U 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 AS5147U 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 AS5147U supports embedded self-diagnostics for fulfilling up to ASIL D in safety relevant applications. The device is available in a TSSOP14 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


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Technical Documents

Type Description Language
Datasheet AS5147U_AS5247U Datasheet v1-04 English

Environmental Documents

Type Description Language
Material Declaration Form MDF_505580009_AS5147U-HTST English
Material Declaration Form MDF_505580009_AS5147U-HTSM English
RoHS Certificate RoHS Certificate_AS5147U/AS5247U English

Other Information

Type Description Language
Block Diagram Block Diagram AS5147U English
Factsheet Position Sensor ICs boost BLDC motor efficiency English
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