M34 Detector circuit overlay

M34 Detector circuit overlay

A thin-film thermopile in a TO-5 package with an active area of 3.16mm x 0.4mm that offers low noise output.

Non-contact temperature measurement for industrial and medical, including infant incubators.

Centered rectangular active area and low noise with moderate output.


  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 M34 (PDF).

M34 Thermopile Detector Technical Specifications

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

Active Area size   3.16 x .4   AA mm Hot junction size, per element.
Element Area   1.264   A mm2  
Number of Junctions   40       Per element.
Number of Channels   1       Per detector package.
Output Voltage 90 115 130 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 6,429 10,088 16,049 SNR √Hz DC, SNR=Vs/Vn
Responsivity 21.6 27.6 31.2 V/W DC, =Vs/HA  (2)
Resistance 4.0 8.0 12.0 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 8.1 11.4 14.0 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .26 .42 .65 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.7 2.7 4.3 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   38   Τ ms Chopped, -3dB point (1)
Field of View   NA   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5 with 3 Pins       Standard package hole size:Ø.150"
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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