Digital ST120 Dual Thermopile (Preliminary)

Detector Circuit Overlay

A two channel silicon- based thermopile in a TO-5 package that includes integrated electronics which incorporate an industry standard digital SMBus interface. Each small active area size is 1.2mm x 1.2mm.

Excellent for gas analysis, environmental monitoring, HVAC and smart home/building control

The digital platform supports easy integration and provides rapid development due to the integrated amplifier, A/D, DSP, MUX and communication protocol.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. Available in 3V or 5V configurations

For more information see the datasheet Digital ST120 Dual (PDF).

Specifications apply at 23°C with Nitrogen encapsulating gas.

Parameter Min Typical Max Symbol Units Comments
Active Area size   1.2 x 1.2   AA mm Hot junction size, per element.
Element Area   1.44   A mm2  
Number of Junctions   80       Per element.
Number of Channels   2       Per detector package.
Digital Output 811 970 1247   Counts With KBr window. DC, H=330µW/cm2 (3)
Temperature Coefficient of   -.04     %/°C Best linear fit, 0° to 85°C (1)
Time Constant   25   Τ ms Detector without electronics, Chopped, -3dB point (1)
Field of View   8°/60°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5       Standard package hole size: (2) .060” sq. holes
Operating Temperature -40   85   °C  
Temperature Sensor 6638 6670 6707   Counts  
Temperature Coefficient of  R   22.9     Counts/°C  

General Specifications: Flat spectral response from 100nm to > 100µm. Linear signal output from 10⁻⁶ to 0.1W/cm². Maximum incident Radiance 0.1W/cm², damage threshold ≥ .5W/cm²

Notes: (1) Parameter is not 100% tested. 90% of all unites meet these specifications. (2) A is detector area in cm². (3) Test Conditions: 500K Blackbody source; Detector active surface 10cm from 0.6513cm Diameter Blackbody Aperture.

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