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ST150 Dual

Silicon Based Thermopile Detector

Features: A two-channel silicon-based thermopile detector in a TO-8 package. Each active area size is 1.5mm x 1.5mm. Affordable two-channel design with strong output and a very low Temperature Coefficient of Responsivity of -0.04%/°C.

Applications: Gas analysis for automotive emissions, environmental air quality, blood alcohol testing.

Benefits: Price and output with moderate signal-to-noise ratio.

Options:

  1. See Standard Windows and Filters (PDF) for list of optical filter options.
  2. ST150R 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.

Datasheet: For more detailed information see the datasheet (PDF).

ST150 Dual Thermopile Detector circuit overlay

ST150 Dual Detector circuit overlay
(click image to see larger image)

ST150 Dual Thermopile Detector

ST150 Dual Thermopile Detector

 

 

ST150 Dual Thermopile Detector Technical Specifications

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

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

2

 

 

Per detector package.

Output Voltage

180

230

280

Vs

μV

DC,  H=330μW/cm2 (3)

Signal-to-Noise Ratio

4,688

6,571

8,946

SNR

√Hz

DC, SNR=Vs/Vn

Responsivity

24.2

31.0

37.7

V/W

DC, =Vs/HA  (2)

Resistance

60

90

120

R

kΩ

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

31.3

35.0

38.4

Vn

nV/√Hz

Vn2=4kTR

Noise Equivalent Power

.83

1.13

1.58

NEP

nW/√Hz

DC,  NEP= VnHA/Vs (2)

Detectivity

.95

1.3

1.8

D*

108√Hz/W

DC,  D*=Vs/ VnH√A  (2)

Time Constant

 

38

 

Τ

ms

Chopped, -3dB point (1)

Field of View

27°/99°

FOV

Degrees

See Assembly Drawings for FOV Description.

Package Type

TO-5

    

Standard package hole size: (2) .090" X 0.90" sq. holes

Element Matching

 

5

10

M

%

M=|VA-VB|/VB (2)

Element Separation

 

3.30

 

 

mm

Center to Center

Operating Temperature

-50

 

100

Ta

°C

  

ST150R Thermistor Options

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.