2M Quad

2M Quad Detector circuit overlay

2M Quad Detector circuit overlay

2M Quad Thermopile Detector

2M Quad Thermopile Detector

A four-channel thin-film thermopile in a TO-8 package. Each active area is 2mm x 2mm. Offers the world's highest 4-channel sensitivity with exceptional signal-to-noise performance in a TO-8 package. Internal aperture minimizes channel-to-channel crosstalk while increasing sensitivity.

Gas analysis for automotive, environmental air quality, industrial sensors and medical monitoring.

Extremely high output with the best signal-to-noise performance with a time constant of 85ms when encapsulated in Argon gas.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).
  3. Order this unit encapsulated with Xenon and this becomes a super-high output detector with very low noise.
  4. See Thermopile Configuration Table for more options.

For more detailed information see the datasheet 2M Quad (PDF).

Parameter Min Typical Max Symbol Units Comments
Active Area size 2 x 2     AA mm Hot junction size, per element.
Element Area
4   A mm2  
Number of Junctions
48       Per element.
Number of Channels
4       Per detector package.
Output Voltage 200 250 300 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 12,739 19,531 33,333 SNR √Hz DC, SNR=Vs/Vn
Responsivity 15.2 18.9 22.7 V/W DC, =Vs/HA  (2)
Resistance 5 10 15 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 9.0 12.8 15.7 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .40 .68 1.03 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.9 3.0 5.0 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   85   Τ ms Chopped, -3dB point (1)
Field of View
N/A   FOV Degrees See Assembly Drawings for FOV Description.
Package Type
TO-8 w/12 Pins       Standard package hole size:Ø.437
Element Matching   5 10 M % M=|VA-VB|/VB (2)
Element Separation   4.57     mm Center to Center
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
Parameter is not 100% tested. 90% of all units meet these specifications.
A is detector area in cm2.
Test Conditions: 500K Blackbody source; Detector active surface 10cm from 0.6513cm Diameter Blackbody Aperture.

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