Posted in | Thermocouples

ST150 Single-Channel Silicon-Based Thermopile Detector

ST150 is a single-channel silicon-based thermopile from Dexter, delivering a low temperature coefficient of responsivity of -0.04%/°C. The low-cost detector has a high output voltage with a quick time constant of 38ms.

It is supplied in a TO-5 package. In addition, it exhibits a very short thermal shock response to changes in ambient temperature.

Benefits

The key benefits of the ST150 include:

  • High output
  • Low cost
  • Large active area of 1.5 x 1.5mm

Options

The options available include:

  • A range of optical filter options are available
  • ST60R Micro version provides an economical (20% tolerance) poly-silicon resistor to be employed as a PTC thermistor
  • Internal 30kΩ 5% NTC chip thermistor offers ambient package temperature measurement
  • Internal aperture accurately defines active area for applications with FOV and/or spot size requirements

Applications

The ST150 is suitable for the following applications:

  • Gas analysis
  • Fire detection
  • Non-contact temperature measurement

Technical Specifications

The technical specifications of the ST150 are summarized in the following table:

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 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, ℜ=Vs/HA (2)
Resistance 60 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 31.3 38.4 44.3 Vn nV/√Hz Vn 2=4kTR
Noise Equivalent Power .83 1.24 1.83 NEP nW/√Hz DC, NEP= Vn HA/Vs (2)
Detectivity .82 1.2 1.8 D* 108cm√Hz/W DC, D*=Vs/ Vn H√A (2)
Time Constant   38   ms Chopped, -3dB point (1)
Field of View 42°/92° FOV Degrees See Assembly Drawings for FOV Description.
Package Type TO-5,     Standard package hole size: Φ.150”
Operating Temperature -50   100 Ta °C Short durations to 125°C possible
ST150R Thermistor Option 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

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.

General Specifications

The general specifications of the ST150 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

Notes

  • 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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