ST120 Dual

Features

A two-channel silicon-based thermopile in a TO-5 package. Each small active area is 1.2mm x 1.2mm. Time constant of 25ms with Nitrogen encapsulation gas. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/Â°C. This detector has a very short thermal shock response to ambient temperature change.

Applications

Excellent for gas analysis, fire suppression, non-contact temperature, and horizon sensor .

Benefit

Low cost with high output.

Options

See Standard Windows and Filters (PDF) for list of optical filter options.
Internal aperture precisely defines active area for applications with FOV and/or spot size requirements. See Aperture Options (PDF) for available sizes.
See Thermopile Configuration Table for more options.
Internal 30kΩ 5% NTC chip thermistor provides ambient package temperature measurement. See DC-4005 section of Thermistor Options (PDF).

ST120 Dual Thermopile Detector
ST120 Dual Detector circuit overlay

Datasheet

For more detailed information see the datasheet:

ST120 Dual 246.71 KB

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Parameter	Min	Typical	Max	Symbol	Units	Comments
Active Area size		1.2 x 1.2		AA	mm	Hot junction size, per element.
Element Area		1.44		A	mm²
Number of Junctions		80				Per element.
Number of Channels		2				Per detector package.
Output Voltage		165		V_s	μV	DC, H=330μW/cm² (3)
Signal-to-Noise Ratio		4,301		SNR	√Hz	DC, SNR=V_s/V_n
Responsivity		34.7			V/W	DC, =V_s/HA (2)
Resistance		90		R	kΩ	Detector element
Temperature Coefficient of		-.04			%/°C	Best linear fit, 0° to 85°C (1)
Temperature Coefficient of R		.02			%/°C	Best fit, 0° to 85°C (1)
Noise Voltage		38.4		V_n	nV/√Hz	V_n²=4kTR
Noise Equivalent Power		1.10		NEP	nW/√Hz	DC, NEP= V_nHA/V_s (2)
Detectivity		1.09		D*	10⁸√Hz/W	DC, D*=V_s/ V_nH√A (2)
Time Constant		25		Τ	ms	Chopped, -3dB point (1)
Field of View		27°/77°		FOV	Degrees	See Assembly Drawings for FOV Description.
Package Type		TO-5				Standard package hole size: Ø.150″
Element Matching		25		M	%	M=\|V_A-V_B\|/V_B (2)
Element Separation		3.30			mm	Center to Center
Operating Temperature	-50		125	T_a	°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.