S25 TO-5

Features

A single-channel silicon-based thermopile that offers the smallest single element active area size at 0.25mm x 0.25mm in a TO-5 package. Delivers a fast 18ms time constant in Argon encapsulation gas and even faster with Neon gas at 9ms. Delivers a very low Temperature Coefficient of Responsivity of -0.04%/°C.

Applications

Excellent for non-contact temperature measurement when extremely small spot size is a design requirement.

Benefit

Small active area, fast time constant with lower output that has a higher cost.

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.

S25 TO-5 Thermopile Detector

Datasheet

For more detailed information see the datasheet:

S25 TO-5 224.61 KB

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Parameter	Min	Typical	Max	Symbol	Units	Comments
Active Area size		.25 x .25		AA	mm	Hot junction size, per element.
Element Area		.0625		A	mm²
Number of Junctions		20				Per element.
Number of Channels		1				Per detector package.
Output Voltage	35	40	45	V_s	μV	DC, H=330μW/cm² (3)
Signal-to-Noise Ratio	1,636	2,062	2,616	SNR	√Hz	DC, SNR=V_s/V_n
Responsivity	169.7	193.9	218.2		V/W	DC, =V_s/HA (2)
Resistance	18	23	28	R	kΩ	Detector element
Temperature Coefficient of		-.04			%/°C	Best linear fit, 0° to 85°C (1)
Temperature Coefficient of R		-.11			%/°C	Best fit, 0° to 85°C (1)
Noise Voltage	17.2	19.4	21.4	V_n	nV/√Hz	V_n²=4kTR
Noise Equivalent Power	.08	.10	.13	NEP	nW/√Hz	DC, NEP= V_nHA/V_s (2)
Detectivity	2.0	2.5	3.2	D*	10⁸√Hz/W	DC, D*=V_s/ V_nH√A (2)
Time Constant		18		Τ	ms	Chopped, -3dB point (1)
Field of View		69°/76°		FOV	Degrees	See Assembly Drawings for FOV Description.
Package Type		TO-5				Standard package hole size:Ø.150″
Operating Temperature	-50		100	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.

* Protected by U.S. Patent No. 5, 059,543 and U.S. Patent No. 5,100,479

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