ST150 Quad

ST150 Quad Detector circuit overlay

ST150 Quad Detector circuit overlay

ST150 Quad Thermopile Detector

ST150 Quad Thermopile Detector

A four-channel silicon-based thermopile detector in a TO-8 package. Each active area size is 1.5mm x 1.5mm. Affordable four-channel design with strong output and a very low Temperature Coefficient of Responsivity of -0.04%/°C. This detector has a very short thermal shock response to ambient temperature change.

Gas analysis for automotive exhaust and laser targeting.

Low price and reasonably high output with moderate signal-to-noise ratio.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. ST60R Quad 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. See Thermopile Configuration Table for more options.

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

Parameter Min Typical Max Symbol Units Comments
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   4       Per detector package.
Output Voltage 180 230 280 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 4,063 5,990 8,946 SNR √Hz DC, SNR=Vs/Vn
Responsivity 24.2 31.0 37.7 V/W DC, =Vs/HA  (2)
Resistance 60 90 120 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 38.4 44.3 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .83 1.24 1.83 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity .82 1.21 1.81 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   38   Τ ms Chopped, -3dB point (1)
Field of View   27°/99°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5       Standard package hole size: (2) .090" X 0.90" sq. holes
Element Matching 10 15 25 M % M=|VA-VB|/VB (2)
Element Separation   3.30     mm Standard package hole size: (4) .090" X .090" sq. holes
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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