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AS5145B Rotary Sensor

12-bit rotary position sensor with digital angle (interface), PWM and ABI output


  • Contactless high resolution rotational position encoding over a full turn of 360 degrees
  • Simple user-programmable zero position and settings
  • • Serial communication interface (SSI) • 10-bit pulse width modulated (PWM) output • Quadrature A/B and Index output signal
  • Rational speeds up to 30,000 rpm
  • Failure detection mode for magnet placement monitoring and loss of power supply
  • Serial read-out of multiple interconnected AS5145 devices using Daisy Chain mode
  • Detects movement of magnet in Z-axis (Red-Yellow-Green indicator)


  • Highest reliability and durability
  • Simple programming
  • Multiple interfaces
  • Ideal for motor applications
  • Failure diagnostics
  • Easy setup
  • Great flexibility at a huge application area

Product parameters

Resolution [bit] 12
Interfaces SSI
Output Digital angle (interface) / ABI / PWM
Max. Speed [rpm]
Overvoltage Protection
Supply Voltage [V] 3.3 or 5.0
Temperature Range [°C] -40 to +150
Package SSOP-16
Automotive Qualified Yes

General Description

The AS5145B is a contactless magnetic rotary position sensor for accurate angular measurement over a full turn of 360° and over an extended ambient temperature range of -40°C to 150°C. The absolute angle measurement provides instant indication of the magnet’s angular position with a resolution of 0.0879° = 4096 positions per revolution via a serial bit stream and as a PWM signal. The incremental output (=ABI-interface) is preprogrammed for 12 bit = 4096 positions.

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

This product suits for the following applications:

  • Transmission gearbox position sensor
  • Headlight position control
  • Valve position sensing


Title Category Headline Buy
AS5145DemoKit Application Board Demo Kit for AS5145
AS5145BMotorBoard Application Board Motor Board for AS5145B
SD4Y-PP Accessories Production Programmer SD4Y


Name Type Description Language Software Firmware V1.5.4.0 (AS5000Programmer) English

Technical Documents

Name Type Description Version Language
PositionSensors_AN000304_1-00.pdf Application Note Tape & Reel Packing Information 1-00 English
AS5140_45_5245_AN000102_1-00.pdf Application Note PPTRIM programming 1-00 English
AS5145_BD000222_1-00.png Block Diagram AS5145 Block Diagram 1-00 English
AS5145_DS000398_1-00.pdf Datasheet Document version 2-00; AS5145A/B/H 1-00 English
AS5145B_PD000224_1-00.png Other Product Document AS5145BEvalKit Image 1-00 English
AS5x40_AS5x45_UG000214_1-00.pdf User Guide Adapter board V2.1 AS5x40/AS5x45 1-00 English
AS5045_AS5145_UG000227_1-00.pdf User Guide Demo board 1-00 English
AS5xxx_UG000387_1-00.pdf User Guide SD4Y Production Programmer Manual 1-00 English
AS5145B_UG000234_1-00.pdf User Guide Eval kit stepper motor 1-00 English

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