ST60 TO-18

ST60 TO-18 Detector circuit overlay

ST60 TO-18 Thermopile Detector

A single-channel silicon-based thermopile provides lowest cost solutions in a small active area of 0.61mm x 0.61mm in a small TO-18 package. Time constant of 18ms with Nitrogen encapsulation gas. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C. This detector has a very short thermal shock response to ambient temperature change.

Excellent for non-contact temperature, horizon sensor, tympanic ear thermometer, infant thermometer applications.

High output, small active area, fast time constant in a small package.


  1. See Standard Windows and Filters (PDF) for list of optical filter options
  2. ST60R TO-18 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 TO-18 (PDF).

Specifications apply at 23°C with KBr Window and Nitrogen encapsulating gas.

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   1       Per detector package.
Output Voltage  65 85  95 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio  1,994 2,834  3,502 SNR √Hz DC, SNR=Vs/Vn
Responsivity  52.9 69.2  77.4 V/W DC, =Vs/HA  (2)
Resistance 45 55 65 R Detector element
Temperature Coefficient of   -.04     %/°C Best linear fit, 0° to 85°C (1)
Temperature Coefficient of  R   .105     %/°C Best fit, 0° to 85°C (1)
Noise Voltage 27.1 30.0 32.6 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .35 .43 .62 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity .99 1.41 1.74 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   15   Τ ms Chopped, -3dB point (1)
Field of View   40°/69°   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-18       Standard package hole size: Ø.080"
Operating Temperature -50   100 Ta °C  
ST60R Thermistor Options 24 28 34 RT PTC Poly-Silicon resistor on detector die.
ST60R Thermistor Temperature Coefficient of R .100 .105 .110   %/°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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