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AS5055A Position Sensor

12-bit magnetic position sensor with digital angle (interface) output


  • Contactless absolute angle position measurement
  • Very low standby current
  • Very small package
  • Immune to external magnetic stray fields


  • Highest reliability and durability in harsh environments
  • Sensor for battery operated devices
  • Lower material cost (no magnetic shielding needed)

Product parameters

Resolution [bit] 12
Interface SPI
Output Digital angle (interface)
Max. Speed [rpm]
Overvoltage Protection
Supply Voltage [V] 3.3
Temperature Range [°C] -40 to +85
Package QFN-16
Automotive Qualified
Longevity Program January 2031

General description

The AS5055A is a new version of the AS5055. It is a 12-bit rotary position sensor (previously known as encoder) for absolute angular measurement over a full turn of 360° based on contactless magnetic sensor technology. This device fits perfectly for on-axis applications where a simple 2-pole magnet rotates above or below the sensor IC. The absolute magnet angular position is measured with a resolution of 12 bit = 4096 positions per revolution and it is provided as a digital value on the serial interface (SPI).

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:

  • Motor position and motion sensor
  • Rotary knob for human machine interfaces
  • Position sensor for battery operated equipment
  • Robotics


Title Category Headline Buy
AS5055AAdapterBoard Application Board Adapter Board for AS5055A
AS5xxxUniversalConnectorBoard Accessories Universal Connector Board for AS5xxx
RMH05-DK-XX Accessories Rotary Magnetic Holder
USBI&PBox Accessories USB I&P Box for I2C/SPI

Technical documents

Type Description Language
Datasheet Document version 2-06 English
Application Note How to disable low power mode function English
Application Note SPI over long distances English
Application Note Error Monitoring English
Application Note AN5000 Magnet Selection Guide v1-04 English
Application Note Tape & Reel Packing Information English
Application Note USB Interface & Programming Box English

Environmental documents

Type Description Language
Material Declaration Form MDF_192660003_AS5055-BQFT English
Material Declaration Form MDF_192660003_AS5055A-BQFM English
RoHS Certificate RoHS Certificate_AS5055A English

Other information

Type Description Language
Block Diagram AS5055A Block Diagram English
Factsheet Contactless Magnetic Position Sensing in Robotics English
Factsheet Small & Low Power English
Factsheet Position Sensors Family Overview English
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