ST150 Detector circuit overlay

ST150 Detector circuit overlay

ST150 Thermopile Detector

ST150 Thermopile Detector

A single-channel silicon-based thermopile that delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C with a high output voltage and a quick time constant of 38ms. This Low-cost detector comes in a TO-5 package. This detector has a very short thermal shock response to ambient temperature change.

Excellent for gas analysis, fire detection, and non-contact temperature measurement.

High output and low cost with larger 1.5mm x 1.5mm active area.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. ST150R version offers a low-cost (20% tolerance) poly-silicon resistor to be used as a PTC thermistor.
  3. Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).
  4. Internal aperture precisely defines active area for applications with FOV and/or spot size requirements. See Aperture Options (PDF) for available sizes.
  5. See Thermopile Configuration Table for more options.

For more detailed information see the datasheet ST150 (PDF).

Active Area size   1.5 x 1.5   AA mm Hot junction size, per element.
Element Area   2.25   A mm2  
Number of Junctions   120       Per element.
Number of Channels   1       Per detector package.
Output Voltage 250 295 340 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 6,185 8,159 10,859 SNR √Hz DC, SNR=Vs/Vn
Responsivity 33.7 39.8 45.8 V/W DC, =Vs/HA  (2)
Resistance 60 80 100 R Detector element
Temperature Coefficient of   -.04     %/°C Best linear fit, 0° to 85°C (1)
Temperature Coefficient of  R   .11     %/°C Best fit, 0° to 85°C (1)
Noise Voltage 31.3 36.2 40.4 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .68 .91 1.20 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.25 1.65 2.20 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   37   Τ ms Chopped, -3dB point (1)
Field of View   57°/103°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5       Standard package hole size: Ø.150
Operating Temperature -50   100 Ta °C  
ST150R Thermistor Options 55 75 95 RT PTC Poly-Silicon resistor on detector die.
ST150R Thermistor Temperature Coefficient of R .107 .11 .113   %/°C ΔR/(RΔT), Best fit, 0° to 85°C (1)

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.
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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