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ST120 Dual

Silicon Based Thermopile Detector

Features: A two-channel silicon-based thermopile in a TO-5 package. Each small active area is 1.2mm x 1.2mm . Time constant of 25ms 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.

Applications: Excellent for gas analysis, fire suppression, non-contact temperature, and horizon sensor .

Benefit: Low cost with high output.

Options:

  1. See Standard Windows and Filters (PDF) for list of optical filter options.
  2. Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).
  3. Internal aperture precisely defines active area for applications with FOV and/or spot size requirements. See Aperture Options (PDF) for available sizes.
  4. See Thermopile Configuration Table for more options.

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

ST60 TO-5 Thermopile Detector circuit overlay

ST120 Dual Detector circuit overlay
(click image to see larger image)

ST60 TO-5 Thermopile Detector

ST120 Dual Thermopile Detector

ST120 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

1.2 x 1.2

AA

mm

Hot junction size, per element.

Element Area

1.44

A

mm2

  

Number of Junctions

80

 

 

Per element.

Number of Channels

2

 

 

Per detector package.

Output Voltage

 

165

 

Vs

μV

DC,  H=330μW/cm2 (3)

Signal-to-Noise Ratio

 

4,301

 

SNR

√Hz

DC, SNR=Vs/Vn

Responsivity

 

34.7

 

V/W

DC, =Vs/HA  (2)

Resistance

 

90

 

R

kΩ

Detector element

Temperature Coefficient of

 

-.04

 

 

%/°C

Best linear fit, 0° to 85°C (1)

Temperature Coefficient of  R

 

.02

 

 

%/°C

Best fit, 0° to 85°C (1)

Noise Voltage

 

38.4

 

Vn

nV/√Hz

Vn2=4kTR

Noise Equivalent Power

 

1.10

 

NEP

nW/√Hz

DC,  NEP= VnHA/Vs (2)

Detectivity

 

1.09

 

D*

108√Hz/W

DC,  D*=Vs/ VnH√A  (2)

Time Constant

 

25

 

Τ

ms

Chopped, -3dB point (1)

Field of View

27°/77°

FOV

Degrees

See Assembly Drawings for FOV Description.

Package Type

TO-5

    

Standard package hole size: Ø.150"

Element Matching

 

25

 

M

%

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

Element Separation

 

3.30

 

 

mm

Center to Center

Operating Temperature

-50

 

125

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.