3 Channel Reflective Incremental Optical Encoder

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The AEDR-850x encoder is the smallest 3 channel optical encoder in the world with digital outputs employing reflective technology for motion control purposes. The encoder is designed to operate over -20° C to 85° C temperature range and therefore is suitable for both commercial and industrial end applications.

This 3 channel optical encoder houses an LED light source and a photodetecting circuit in a single package. The small size of 3.95 mm (L) x 3.4 mm (W) x 0.9562 mm (H), allows it to be used in a wide range of miniature commercial applications where size and space constraints exist.

The AEDR-850x series encoders offer two-channel quadrature digital outputs and a 3rd channel, index digital outputs. Being TTL compatible, the outputs of the AEDR-850X 3 channel optical encoder can be interfaced directly with most of the signal processing circuitries. Hence the encoder provides great design-in flexibility and easy integration into existing systems.



  • World smallest 3 channels reflective technology encoder.
  • Surface mount leadless package 3.95 mm (L) x 3.4 mm(W) x 0.9562 mm (H)
  • 3 channels; two channel quadrature digital outputs for direction sensing and a 3rd channel, Index digital output.
  • Build in interpolator, factor of 1x, 2x and 4x selectable via external pinouts
  • TTL compatible
  • Single 5 V supply
  • -20° C to 85° C absolute operating temperature
  • Encoding resolution: 294 to 304 (lines/inch)
  • Index Gating, Gated 360º e 

The ordering quantity for AEDR-8502-100 is 1,000 pcs.


  • Close Loop stepper Motors
  • Miniature Motors
  • Printers
  • Copiers
  • Card readers
  • Scanners
  • Projectors
  • Consumer and Industrial Product Applications

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Motion Type Rotary
Optical Method Reflective
Output Type Digital
Product Size (mm) 3.4Wx3.95Lx0.9562 H
Units In Shipping Tube 1000.0
Resolution 304 LPI
Application Note1 i
Data Sheet1 i
Reliability Data Sheet1 i