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TM34

Thin Film Based Thermopile Detector

Features: A three-channel thin-film thermopile in a TO-8 package. Each symmetrically positioned active area is 3.16mm x 0.4mm. Offers low noise output and internal aperture minimizing channel-to-channel crosstalk while increasing sensitivity.

Applications: Gas analysis for automotive, environmental air quality, industrial sensors and medical monitoring.

Benefit: Low noise and 3-channels in a TO-8 package with moderate 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. See Thermopile Configuration Table for more options.

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

TM34 Thermopile Detector circuit overlay

TM34 Detector circuit overlay
(click image to see larger image)

 

 

 

 

TM34 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

3.16 x .4

AA

mm

Hot junction size, per element.

Element Area

1.264

A

mm2

  

Number of Junctions

40

 

 

Per element.

Number of Channels

1

 

 

Per detector package.

Output Voltage

90

115

130

Vs

μV

DC,  H=330μW/cm2 (3)

Signal-to-Noise Ratio

6,429

10,088

16,049

SNR

√Hz

DC, SNR=Vs/Vn

Responsivity

21.6

27.6

31.2

V/W

DC, =Vs/HA  (2)

Resistance

4.0

8.0

12

R

kΩ

Detector element

Temperature Coefficient of

 

-.36

 

 

%/°C

Best linear fit, 0° to 85°C (1)

Temperature Coefficient of  R

 

-.2

 

 

%/°C

Best fit, 0° to 85°C (1)

Noise Voltage

8.1

11.4

14.0

Vn

nV/√Hz

Vn2=4kTR

Noise Equivalent Power

.26

.42

.65

NEP

nW/√Hz

DC,  NEP= VnHA/Vs (2)

Detectivity

1.7

2.7

4.3

D*

108√Hz/W

DC,  D*=Vs/ VnH√A  (2)

Time Constant

 

38

 

Τ

ms

Chopped, -3dB point (1)

Field of View

NA

FOV

Degrees

See Assembly Drawings for FOV Description.

Package Type

TO-8 with 3 Pins

   

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.