3M Detector circuit overlay

3M Detector circuit overlay

3M Thermopile Detector

3M Thermopile Detector

A thin film-based single element thermopile. The highest output detector in our line-up.

Excellent for laser power measurement and can be used for gas analysis.

Highest signal-to-noise ratio with larger TO-8 package and higher cost.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. See Thermopile Configuration Table for more options.

For more detailed information see the datasheet 3M (PDF).

Specifications apply at 23°C with KBr Window and Argon encapsulating gas.

Parameter Min Typical Max Symbol Units Comments
Active Area size
3 x 3   AA mm Hot junction size, per element.
Element Area
9   A mm2  
Number of Junctions
72       Per element.
Number of Channels 1       Per detector package.
Output Voltage 400 440 500 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 18,100 25,581 31,847 SNR √Hz DC, SNR=Vs/Vn
Responsivity 13.5 14.8 16.8 V/W DC, =Vs/HA  (2)
Resistance 15 18 30 R Detector element
Temperature Coefficient of   -.36     %/°C Best linear fit, 0° to 85°C (1)
Temperature Coefficient of  R   -.2     %/°C Best fit, 0° to 85°C (1)
Noise Voltage 15.7 17.2 22.1 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .93 1.16 1.64 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.8 2.6 3.2 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   100   Τ ms Chopped, -3dB point (1)
Field of View
63°/120°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type
TO-8       Standard package hole size:Ø.080
Operating Temperature -50   100 Ta °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

(1) Parameter is not 100% tested. 90% of all units 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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