DR26 Thermopile circuit overlay

DR26 Thermopile circuit overlay

DR26 Thermopile Detector

DR26 Thermopile Detector

A two-channel thin-film thermopile that offers low noise in a TO-5 package. Each small active area is 2mm x 0.6mm. This is our lowest noise-voltage two-channel detector.

Security, intrusion detection and human presence monitoring, including identifying direction of travel. Other potential applications include non-contact temperature measurement.

Two-channel output and low noise with small active area size and no internal aperture.


  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 DR26 (PDF).

Parameter Min Typical Max Symbol Units Comments
Active Area size   2 x .6   AA mm Hot junction size, per element.
Element Area   1.2   A mm2  
Number of Junctions   26       Per element.
Number of Channels   2       Per detector package.
Output Voltage 45 54 62 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 4,206 5,684 7,209 SNR √Hz DC, SNR=Vs/Vn
Responsivity 11.4 13.6 15.7 V/W DC, =Vs/HA  (2)
Resistance 4.5 5.5 7.0 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 8.6 9.5 10.7 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .55 .71 .94 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 1.2 1.6 2.0 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-5       Standard package hole size:Ø.080
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

(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.

Product Finder

Product Comparison Guide

The Gold Standard

The Collaboration Station

Contact Us