ST60 Dual

ST60 Dual Detector circuit overlay

ST60 Dual Detector circuit overlay

ST60 Dual Thermopile Detector

ST60 Dual Thermopile Detector

A two-channel silicon-based thermopile detector in a TO-5 package. Each small active area size is 0.61mm x 0.61mm. This is our lowest-cost and fastest time constant two-channel detector. It delivers a time constant of 18ms with Nitrogen encapsulation gas combined with 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 in handheld gas monitors for automotive exhaust, industrial/environmental leak detection and air quality monitoring.

Low cost and small active area size with medium output.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. ST60R Dual 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 ST60 Dual (PDF).

Parameter Min Typical Max Symbol Units Comments
Active Area size   .61 x .61   AA mm Hot junction size, per element.
Element Area   .37   A mm2  
Number of Junctions   80       Per element.
Number of Channels   2       Per detector package.
Output Voltage 50 62 74 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 1,381 1,981 2,891 SNR √Hz DC, SNR=Vs/Vn
Responsivity 40.7 50.5 60.3 V/W DC, =Vs/HA  (2)
Resistance 40 60 80 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 25.6 31.3 36.2 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .42 .62 .89 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity .69 .98 1.44 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   18   Τ ms Chopped, -3dB point (1)
Field of View   15°/47°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-5       Standard package hole size: (2) .046" X 046 " sq. holes
Element Matching   5 10 M % M=|VA-VB|/VB (2)
Element Separation   2.08     mm Center to Center
Operating Temperature -50   100 Ta °C  
ST60R Thermistor Options ~24 30 ~36 RT PTC Poly-Silicon resistor on detector die.
ST60R 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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