Quick Assembly Three Channel Optical Encoder

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The HEDM-5540 series are high performance, low cost, three channel optical incremental encoders. These encoders emphasize high reliability, high resolution, and easy assembly.

Each encoder contains a lensed LED source, an integrated circuit with detectors and output circuitry, and a codewheel which rotates between the emitter and detector IC. The outputs of the HEDM-5540 series are two square waves in quadrature. Additionally, these encoder series also have a third channel index output in addition to the two channel quadrature. This index output is a 90 electrical degree, high true index pulse which is generated once for each full rotation of the codewheel.

The HEDM series utilizes a film codewheel allowing for resolutions of 1000 CPR. These encoders may be quickly and easily mounted to a motor.

The quadrature signals and the index pulse are accessed through five 0.025 inch square pins located on 0.1 inch centers.

Standard resolutions of 1000 counts per revolution are presently available. Consult local Broadcom sales representatives for more options and resolutions.


  • Two Channel Quadrature Output with Optional Index Pulse
  • Quick and Easy Assembly
  • No Signal Adjustment Required
  • External Mounting Ears Available
  • Low Cost
  • Resolutions of 1000 Counts Per Revolution
  • Small Size
  • -40 degrees C to 100 degrees C Operating Temperature
  • TTL Compatible
  • Single 5 V Supply


Typical applications include printers, plotters, tape drives, positioning tables, and automatic handlers.

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Line Driver N
Frequency 100.0
Motion Type Rotary
Optical Method Transmissive
Optical Radius (mm) 11.0
Shaft Diameter 5
Shaft Diameter (Unit of Measure) mm
Terminations Pins for connector
Through Hole N
Resolution 1000 CPR
Shaft Diameter 5 mm
Product Change Notice (PCN)5 i