SLA32 Array circuit overlay

SLA32 Array circuit overlay

SLA32 Thermopile Array

SLA32 Thermopile Array

A 2 x 16 staggered element silicon-based thermopile array. Each active area is 0.05mm x 0.65mm with a time constant of 7ms and a very low Temperature Coefficient of Responsivity of -0.01%/°C. It is packaged in a 38-pin DIP.

Spectral analysis and line temperature measurements.

A proven design with no readout electronics.


  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).

For more detailed information see the datasheet SLA32 (PDF).

Export License Required

Not Currently RoHS Compliant

SLA32 Thermopile Array Technical Specifications

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

Parameter Min Typical Max Symbol Units Comments
Active Area size   0.5 x .65   AA mm Hot junction size, per element.
Element Area   .0325   A mm2  
Number of Junctions   74       Per element.
Number of Channels   2 x 16 staggered       Per detector package.
Output Voltage 10.0 14.8 20.0 Vs μV DC,  H=330μW/cm2 (3)
Signal-to-Noise Ratio 250 423 741 SNR √Hz DC, SNR=Vs/Vn
Responsivity 93.2 138.0 186.5 V/W DC, =Vs/HA  (2)
Resistance 45 76 100 R Detector element
Temperature Coefficient of   -.01     %/°C Best linear fit, 0° to 85°C (1)
Temperature Coefficient of  R   -.2     %/°C Best fit, 0° to 85°C (1)
Noise Voltage 27 35 40 Vn nV/√Hz Vn2=4kTR
Noise Equivalent Power .15 .26 .43 NEP nW/√Hz DC,  NEP= VnHA/Vs (2)
Detectivity 4.2 7.1 12.0 D* 108√Hz/W DC,  D*=Vs/ VnH√A  (2)
Time Constant   7   Τ ms Chopped, -3dB point (1)
Field of View   N/A   FOV Degrees See Assembly Drawings for FOV Description.
Package Type   .97" x 1.27"       Standard package hole size:Ø.437
Element Matching   5 10 M % M=|VA-VB|/VB (2)
Element Separation   .61     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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