M14 Detector circuit overlay

M14 Detector circuit overlay

M14 Thermopile Detector

M14 Thermopile Detector

A single-channel thin film-based thermopile offering very low noise in a compact TO-18 package with a small active area of 0.92mm x 0.4mm. This is one of the lowest noise thermopiles you can buy and provides a fast 14ms time constant with Argon encapsulation gas.

Excellent for ear thermometers and handheld non-contact temperature measurement.

Small package size and very low noise with lower signal-to-noise ratio.


  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 M14 (PDF).

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

Parameter Min Typical Max Symbol Units Comments
Active Area size   .92 x .4   AA mm Hot junction size, per element.
Element Area   .368   A mm2  
Number of Junctions   12       Per element.
Number of Channels   1       Per detector package.
Output Voltage 15 20 25 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 1,852 2,857 5,000 SNR √Hz DC, SNR=Vs/Vn
Responsivity 12.4 16.5 20.6 V/W DC, =Vs/HA  (2)
Resistance 1.5 3.0 4.0 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 5.0 7.0 8.1 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .24 .43 .66 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity .93 1.4 2.5 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   14   Τ ms Chopped, -3dB point (1)
Field of View   53°/105°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-18       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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