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S25 TO-18*

Silicon Based Thermopile Detector

S25 TO-18 – Features: A single-channel silicon-based thermopile that offers the smallest single element active area size at 0.25mm x 0.25mm in a small TO-18 package. Delivers a very fast 12ms time constant in Argon encapsulation gas and even faster with Neon gas at 9ms. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C.

Applications: Excellent for non-contact temperature measurement when extremely small spot size is a design requirement.

Benefit: Small active area, fast time constant in a small package with lower output that has a higher cost.

Options:

  1. See Standard Windows and Filters (PDF) for list of optical filter options.
  2. See Thermopile Configuration Table for more options.

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

 S25 Thermopile Detector circuit overlay

S25 Detector circuit overlay
(click image to see larger image)

 

S25 TO-18 Thermopile Detector Technical Specifications

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

Parameter
Min
Typical
Max
Symbol
Units
Comments
Active Area size

.25 x .25

AA

mm

 Hot junction size, per element.
Number of Junctions

20

 Per element.
Output Voltage

 

24

 

Vs

μV

 DC, H=330μW/cm2 (3)
Responsivity

 

111.5

 

V/W

 DC, =Vs/HA (2)
Temperature Coefficient of

-.04

%/°C

 Best linear fit, 0° to 85°C (1)
Noise Voltage

17.2

19.4

21.4

Vn

nV/√Hz

 Vn2=4kTR
Detectivity

 

1.44

 

D*

108√Hz/W

 DC, D*=Vs/ VnH√A (2)
Field of View

88°/103°

FOV

Degrees

 See Assembly Drawings for FOV Description.
Operating Temperature

-50

100

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/cm2Notes:
(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.* Protected by U.S. Patent No. 5, 059,543 and U.S. Patent No. 5,100,479