ST120 TO-5

Features

A single-channel silicon-based thermopile provides lowest cost solutions in a small active area of 1.2mm x 1.2mm in a TO-5 package. Time constant of 25ms with Nitrogen encapsulation gas. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/°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 TO-5 Detector circuit overlay
ST120 TO-5 Thermopile Detector

Datasheet

For more detailed information see the datasheet:

ST120 TO-5 242.25 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		1				Per detector package.
Output Voltage	150	190	230	V_s	μV	DC, H=330μW/cm² (3)
Signal-to-Noise Ratio	3,459	4,953	6,359	SNR	√Hz	DC, SNR=V_s/V_n
Responsivity	31.6	37.9	48.4		V/W	DC, =V_s/HA (2)
Resistance	80	90	115	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	36.2	37.4	43.4	V_n	nV/√Hz	V_n²=4kTR
Noise Equivalent Power	.75	1.04	1.37	NEP	nW/√Hz	DC, NEP= V_nHA/V_s (2)
Detectivity	.87	1.15	1.61	D*	10⁸√Hz/W	DC, D*=V_s/ V_nH√A (2)
Time Constant		25		Τ	ms	Chopped, -3dB point (1)
Field of View		61°/97°		FOV	Degrees	See Assembly Drawings for FOV Description.
Package Type		TO-5				Standard package hole size: Ø.150″
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.