ST150 With Diffractive Lens

ST150 With Diffractive Lens

ST150 With Diffractive Lens

ST150 Thermopile Detector

ST150 Thermopile Detector

A single-channel silicon-based thermopile with integrated diffractive lens and internal baffle that delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C with a high output voltage, 19.5° FOV and a quick time constant of 38ms. This Low-cost detector comes in a TO-5 package and has a very short thermal shock response to ambient temperature change.

Excellent for 19.5° FOV non-contact temperature measurement.

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


  1. ST150R version offers a low-cost (20% tolerance) poly-silicon resistor to be used as a PTC thermistor.
  2. Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).
  3. See Thermopile Configuration Table for more options.

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

ST150 Thermopile Detector Technical Specifications

Specifications apply at 23°C with AR coated Diffractive Lens (P/N: DC-6132) and Nitrogen encapsulating gas

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   1       Per detector package.
Output Voltage 240 325 400 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 6,250 9,286 12,780 SNR √Hz DC, SNR=Vs/Vn
Responsivity 32.3 43.8 53.9 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 35.0 38.4 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .58 .80 1.19 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.26 1.87 2.58 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   38   Τ ms Chopped, -3dB point (1)
Field of View   19.5°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5 with lens       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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