AR35 Series

AR35-A21S, AR35-A21E Miniature Programmable Absolute Encoder

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The AR18 and AR35 Series are the miniature Absolute Encoder ASIC designed to cater for the growing demand on the space constraint application. The AR18 encoder is designed for an overall diameter of 18 mm and offers user-programmable resolution ranging from 17, 19, and 21 bit single-turn absolute output. The AR35 encoder is designed for an overall diameter of 35 mm and offers 17 and 21 bits single-turn absolute output. Both the AR18 and AR35 series provide the incremental ABI and UVW in differential mode. Both come with a recommended high temperature range of –40°C to 115°C suitable for most industrial applications. Dual-mode operating voltage of 3.3V and 5V enable handheld and portable device applications.


  • Miniature absolute encoder ASIC surface mount DFN package: 10.9 mm (L) x 9.1 mm (W) x 1.5 mm (H)
  • User-programmable resolution ranging from:
  • – 17, 19, and 21 bit single turn (OD18)
  • – 17 and 21 bit single turn (OD35)
  • User-programmable incremental output (ABI) resolution ranging from 128 to 8192 CPR
  • User-programmable commutation signal (UVW) ranging from 2, 3, 4, 5, 12, 30, 32 pole pair
  • Differential output for ABI and UVW
  • High temperature range of –40°C to 115°C suitable for most of the industrial operation
  • Dual-mode operating voltage of 3.3V and 5V, enabling handheld and portable device applications
  • Selectable SSI mode communication protocol
  • Selectable RS485 mode communication protocol
  • RoHs compliance





  • Robotic automation and engineering
  • Factory automation and drone
  • Medical and dentistry, devices and equipment
  • High-accuracy portable and handheld devices
  • Miniature motor, servo motor, linear actuator



Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Preliminary
Distrib. Inventory No
RoHS6 Compliant Y
Line Driver Y
Motion Type Rotary
Optical Method Reflective
Output Code SSI-3 Wires or ESL (Encoder Serial Link)
Operating Temperature Range -40°C to +115°C
Output Type Digital
Product Size (mm) Surface mount DFN package - 10.9mm (L) x 9.1mm (W) x 1.5mm (H)
Shaft Diameter N/A
Resolution 21 Bits
Application Note3 i
Data Sheet2 i
Reliability Data Sheet1 i