Waters Corporation
With over 50 years in business, Waters Corporation is now one of largest companies in the analyti……...

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 | ℜ | V/W | DC, ℜ=Vs/HA (2) |
| Resistance | 60 | 90 | 120 | R | kΩ | 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 | ℑ | 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 | kΩ | 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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