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S25 TO-5

S25 Detector circuit overlay
S25 Detector circuit overlay
S25 TO-5 Thermopile Detector
S25 TO-5 Thermopile Detector

Silicon Based Thermopile Detector

Features:
A single-channel silicon-based thermopile that offers the smallest single element active area size at 0.25mm x 0.25mm in a TO-5 package. Delivers a fast 18ms 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 with lower output that has a higher cost.
Options:
  1. See Standard Windows and Filters (PDF) for list of optical filter options.
  2. Internal aperture precisely defines active area for applications with FOV and/or spot size requirements. See Aperture Options (PDF) for available sizes.
  3. See Thermopile Configuration Table for more options.
Datasheet:
For more detailed information see the datasheet
S25 TO-5 Data Sheet (PDF)

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.

Element Area

.0625

A

mm2

  

Number of Junctions

20

 

 

Per element.

Number of Channels

1

 

 

Per detector package.

Output Voltage

35

40

45

Vs

μV

DC,  H=330μW/cm2 (3)

Signal-to-Noise Ratio

1,636

2,062

2,616

SNR

√Hz

DC, SNR=Vs/Vn

Responsivity

169.7

193.9

218.2

V/W

DC, =Vs/HA  (2)

Resistance

18

23

28

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

17.2

19.4

21.4

Vn

nV/√Hz

Vn2=4kTR

Noise Equivalent Power

.08

.10

.13

NEP

nW/√Hz

DC,  NEP= VnHA/Vs (2)

Detectivity

2.0

2.5

3.2

D*

108√Hz/W

DC,  D*=Vs/ VnH√A  (2)

Time Constant

 

18

 

Τ

ms

Chopped, -3dB point (1)

Field of View

69°/76°

FOV

Degrees

See Assembly Drawings for FOV Description.

Package Type

TO-5

    

Standard package hole size:Ø.150"

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/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.

 

* Protected by U.S. Patent No. 5, 059,543 and U.S. Patent No. 5,100,479