Posted in | Thermocouples

S60M TO-18 Single-Channel Silicon-Based Thermopile

Dexter‘s S60M TO-18 is a single-channel silicon-based thermopile that delivers high output. It features a small active area with dimensions of 0.6mm x 0.6mm in a small TO-18 package.

The silicon-based thermopile provides a rapid 18ms time constant in Argon encapsulation gas and faster 9ms time constant in Neon gas. In addition, the thermopile offers a low temperature responsivity coefficient of -0.04%/°C.


The key benefits of the S60M TO-18 thermopile include:

  • Small active area
  • Fast time constant
  • High output
  • Low temperature responsivity coefficient


The S60M TO-18 thermopile can be used in the following applications:

  • Gas analysis
  • Non-contact measurement

Technical Specifications

The technical specifications of the S60M TO-18 are summarized in the following table:

Parameter Min Typical Max Symbol Units Comments
Active Area size .6 x .6 AA mm Hot junction size, per element.
Element Area .36 A mm2  
Number of Junctions 72     Per element.
Number of Channels 1     Per detector package.
Output Voltage   89   Vs μV DC, H=330μW/cm2 (3)
Signal-to-Noise Ratio   2,320   SNR √Hz DC, SNR=Vs/Vn
Responsivity   74.9   V/W DC, ℜ=Vs/HA (2)
Resistance 65 90 120 R Detector element
Temperature Coefficient of ℜ   -.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 32.6 38.4 42.4 Vn nV/√Hz Vn 2=4kTR
Noise Equivalent Power   .51   NEP nW/√Hz DC, NEP= Vn HA/Vs (2)
Detectivity   1.17   D* 108cm√Hz/W DC, D*=Vs/ Vn H√A (2)
Time Constant   18   ms Chopped, -3dB point (1)
Field of View 76°/111° FOV Degrees See Assembly Drawings for FOV Description.
Package Type TO-18     Standard package hole size: Φ.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

Notes: (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.

*Protected by U.S. Patent No. 5,059,543 and U.S. Patent No. 5,100,479

General Specifications

The general specifications of the S60M TO-18 are listed below:

  • Flat spectral response from 100nm to > 100µm
  • Linear signal output from 10-6 to 0.1W/cm2
  • Maximum incident radiance is 0.1W/cm2
  • Damage threshold is ≥ 0.5W/cm2


  • Specifications apply at 23°C with KBr window and nitrogen encapsulating gas
  • 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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