Miniature Panel Mount Optical Encoders

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The HRPG series is a family of miniature panel mount optical encoders, also known as Rotary Pulse Generators (RPG) and digital potentiometers. The HRPG is designed to be mounted on a front panel and used as a rotary, data-entry device. The HRPG is very flexible for numerous applications due to the many configuration options available. These options include detents or smooth, multiple terminations, versatile mounting capabilities, and different shaft configurations.

The HRPG uses optical reflective technology providing accuracy and reliability to the encoder. An LED emits a beam of light onto the specular codewheel surface. When the light strikes the surface, it projects the image of the codewheel back on the photodetector, causing the output to change. The entire detector circuit is on one IC, thus the part is less sensitive to temperature and other environmental variations.


  • Miniature Size
  • Smooth Turning and Detented Options
  • Multiple Mounting Bracket Options
  • Uses Optical Reflective Technology
  • Quadrature Digital Output
  • Small Footprint for Versatile Mounting
  • TTL Compatible

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Optical Method Reflective
Shaft Dcut Y
Shaft Diameter 1/4
Shaft Diameter (Unit of Measure) in
Shaft Feel Static Drag
Smooth/Detended Turning 0.3
Shaft Length Uom in
Terminations Pins Rear With Bracket
Smooth/Detended Turning 0.3 in
Resolution 120 CPR
Shaft Diameter 1/4 in
Product Change Notice (PCN)2 i
Reliability Data Sheet1 i