AS37-H39B Series

39-bit Multi-turn Absolute Encoder with Battery Backup

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The AS37-H39B Series is a multi-turn absolute encoder series with 39-bit resolution (23-bit single-turn and 16-bit multi-turn). The 16-bit multi-turn encoder has a battery backup sufficient to power the revolution tracking circuitry in the event of an external power loss. The AS37-H39B Series is a housed encoder consisting of a patterned disk, a light source, and photosensitive elements that translate mechanical motion to electrical signal.


  • 39-bit resolution: 16-bit multi-turn (with battery backup) & 23-bit optical single-turn
  • Alarm features with CRC and alarm status bits 
  • Overall encoder diameter of Ø37 mm and typical mounting height of 28 mm
  • Supports 8mm diameter of blind hollow & taper shaft
  • 5K bits of user accessible memory in E2PROM


  • Robotics
  • Factory Automation
  • Linear Positioning System
  • CNC Machine Tool
  • Medical and Lab Equipment
  • Wind Turbine

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory No
RoHS6 Compliant Y
Line Driver Y
Motion Type Rotary
Optical Method Transmissive
Output Code Binary
Output Type Digital
Shaft Diameter 8
Resolution 39 Bits
Application Note1 i
Data Sheet1 i
Reliability Data Sheet1 i