DR46 Detector circuit overlay

DR46 Detector circuit overlay

DR46 Thermopile Detector

DR46 Thermopile Detector

A two-channel or a one-channel compensated thin-film thermopile in a TO-8 package. Each active area is 4mm x 0.6mm. Offers high output with excellent signal-to-noise ratio. An internal aperture minimizes channel-to-channel crosstalk increasing sensitivity.

Gas analysis, non-contact temperature measurement, fire detection / suppression.

High output, low noise and dual channel in a TO-8 package.


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

For more detailed information see the datasheet DR46 (PDF).

DR46 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   4 x .6   AA mm Hot junction size, per element.
Element Area   2.4   A mm2  
Number of Junctions   50       Per element.
Number of Channels   2       Per detector package.
Output Voltage 170 210 250 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 10,828 16,406 23,364 SNR √Hz DC, SNR=Vs/Vn
Responsivity 21.5 26.5 31.6 V/W DC, =Vs/HA  (2)
Resistance 7 10 15 R 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 10.7 12.8 15.7 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .34 .48 .73 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 2.1 3.2 4.6 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   40   Τ ms Chopped, -3dB point (1)
Field of View   N/A   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   TO-8 with 5 Pins       Standard package hole size:Ø.437
Element Matching   5 10


% M=|VA-VB|/VB (2)
Element Separation   2.0     mm Center to Center
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
Parameter is not 100% tested. 90% of all units meet these specifications.
A is detector area in cm2.
Test Conditions: 500K Blackbody source; Detector active surface 10cm from 0.6513cm Diameter Blackbody Aperture.

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