High Temperature 140 degrees C Three Channel Optical Incremental Encoder Modules

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The HEDT-9040 and HEDT-9140 are high temperature three channel optical incremental encoder modules. When used with a codewheel, these low cost modules detect rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photodetector array, these modules provide the same high performance found in the HEDS-9040/9140 three channel encoders.

The HEDT-9040 and 9140 have two channel quadrature outputs plus a third channel index output. This index output is a 90 electrical degree high true index pulse.

The HEDT-9040 is designed for codewheels which have an optical radius of 23.36 mm (0.920 in.). The HEDT-9140 is designed for codewheels which have an optical radius of 11.00 mm (0.433 in.).

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

Resolutions between 360 and 1024 counts per revolution are available. Consult local Broadcom sales representatives for other resolutions.


  • -40 degrees C to 140 degrees C Operating Temperature
  • Two Channel Quadrature Output with Index Pulse
  • Resolution up to 1024 Counts per Revolution
  • Low Cost
  • Easy to Mount
  • No Signal Adjustment Required
  • Small Size

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
Motion Type Rotary
Optical Radius (mm) 11.0
Resolution 512
Resolution (Unit of Measure) CPR
Resolution 512 CPR
Data Sheet1 i
Product Change Notice (PCN)1 i
Reliability Data Sheet1 i