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Thermistor Options
In order to make a radiometric measurement with thermopile detectors, you will need to
approximate the thermopile’s cold junction temperature. Dexter offers optional externally
mounted thermistors for all models as well as internally mounted thermistors on several of
our models. Chip Thermistors (DC-4005) can be mounted internally in our models: “ST”,
2M Quad, TM34, T34, 10-Channel, and SLA32 Array to monitor ambient temperature of the
thermopile. Chip-in-Glass (DC-4007) or Bead Thermistors can be mounted externally on
all detector packages between detector pins using epoxy. Customers may supply
thermistors or choose from Dexter's standard thermistors. The on detector die poly-silicon
resistor / thermistor (ST60R) is also shown below. Please contact Dexter Research Center
for pricing.
Chip Thermistor DC-4005
Dexter part number: DC-4005 (formerly MT04)
Thermometrics P/N: HM25NH3030J
Description: 30k Ω 5% H-curve chip thermistor
Resistance @ 25°C: 30,000 Ω
Tolerance on resistance @ 25°C: +/-5%
Resistance ratio (R0°C/R70°C): 17.75
Dimensions (width, length, thick) inches: .025 x .025 x .010
DC-4005 Resistance as a function of temperature
1,000,000
Ohms
100,000
10,000
363,300.0
273,420.0
207,600.0
158,910.0
122,580.0
95,355.0
74,655.0
58,857.0
46,716.0
37,320.0
30,000.0
24,261.0
19,734.0
16,140.0
13,272.0
10,971.0
9,114.0
7,605.0
6,378.0
5,372.4
4,544.4
3,860.4
3,292.2
2,818.8
2,422.2
2,089.2
1,808.1
1,000
-30 -20 -10
0
10
20
30
40
50
60
70
80
DC-4005
Degree C
Ohms
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
363,300.0
273,420.0
207,600.0
158,910.0
122,580.0
95,355.0
74,655.0
58,857.0
46,716.0
37,320.0
30,000.0
24,261.0
19,734.0
16,140.0
13,272.0
10,971.0
9,114.0
7,605.0
6,378.0
5,372.4
4,544.4
3,860.4
3,292.2
2,818.8
2,422.2
2,089.2
1,808.1
90 100 110 120
Degrees C
xxii
8592 Rev E
Update: 12/20/06
Information subject to change without notice
Dexter Research Center • 7300 Huron River Drive • Dexter, MI 48130 • www.DexterResearch.com • +1 734 426 3921
We’re
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Chip-in-Glass Thermistor DC-4007
DC-4007
Dexter part number: DC-4007 (formerly MT06)
Thermometrics P/N: GC32KB203
Description: 20k Ω 5% B-curve Chip-in-Glass thermistor
Resistance @ 25°C: 20,000 Ω
Tolerance on resistance @ 25°C: +/-5%
Resistance ratio (R0°C/R70°C): 18.77
Dimensions (diameter, length) inches: Ø.033 x .084
DC-4007 Resistance as a function of temperature
1,000,000
111,697.6
85,271.8
65,667.5
50,992.2
39,911.7
31,476.2
25,003.8
20,000.0
16,103.7
13,048.7
10,637.6
8,722.5
7,192.0
5,961.9
4,967.5
4,159.4
3,499.2
2,957.2
2,510.1
2,139.6
1,831.1
1,573.3
1,356.8
1,174.3
1,020.0
888.9
777.2
681.6
599.6
529.0
468.1
415.3
369.4
329.4
Ohms
100,000
10,000
1,000
294.5
Degree C
Ohms
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
111,697.6
85,271.8
65,667.5
50,992.2
39,911.7
31,476.2
25,003.8
20,000.0
16,103.7
13,048.7
10,637.6
8,722.5
7,192.0
5,961.9
4,967.5
4,159.4
3,499.2
2,957.2
2,510.1
2,139.6
1,831.1
1,573.3
1,356.8
1,174.3
1,020.0
888.9
777.2
681.6
599.6
529.0
468.1
415.3
369.4
329.4
294.5
100
-10
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150 160 170
Degrees C
8592 Rev E
Update: 12/20/06
Information subject to change without notice
Dexter Research Center • 7300 Huron River Drive • Dexter, MI 48130 • www.DexterResearch.com • +1 734 426 3921
xxiii
We’re
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Thermistor ST60R
Dexter part number: ST60R
Description: 30kΩ 20% on detector die thermistor, poly-silicon curve
.07%±.003%/°C [ΔR/(R*ΔT)]
Resistance @ 23°C: 30,000Ω
Tolerance on resistance @ 23°C: +/-20%
Resistance ratio (R0°C/R70°C): .953
Dimensions inches: NA`
ST60R
ST60R Resistance as a function of temperature
34,000
33,000
Ohms
32,000
31,592
31,489
31,385
31,282
31,179
31,075
30,972
30,868
30,765
30,662
30,558
30,455
30,352
30,248
30,145
30,041
30,000
29,938
29,835
29,731
29,628
29,524
31,000
30,000
29,000
Degree C
Ohms
0
5
10
15
20
23
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
29,524
29,628
29,731
29,835
29,938
30,000
30,041
30,145
30,248
30,352
30,455
30,558
30,662
30,765
30,868
30,972
31,075
31,179
31,282
31,385
31,489
31,592
28,000
0
10
20
30
40
50
60
70
80
90
100
110
Degrees C
xxiv 8592 Rev E
Update: 12/20/06
Information subject to change without notice
Dexter Research Center • 7300 Huron River Drive • Dexter, MI 48130 • www.DexterResearch.com • +1 734 426 3921
We’re
Everywhere
It Matters…
Thermistor ST150R
Dexter part number: ST150R
Description: 75kΩ 20% on detector die thermistor, poly-silicon curve
.06%±.003%/°C [ΔR/(R*ΔT)]
Resistance @ 23°C: 75,000Ω
Tolerance on resistance @ 23°C: +/-20%
Resistance ratio (R0°C/R70°C): .957
Dimensions inches: NA
ST150R
ST150R Resistance as a function of temperature
Degree C
0
5
10
15
20
23
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
79,000
78,635
78,399
78,163
78,000
77,927
77,691
77,455
77,219
77,000
76,983
76,747
Ohms
76,511
76,274
76,038
76,000
75,802
75,566
75,330
75,094
75,000
74,858
75,000
74,622
74,386
74,150
74,000
73,914
Ohms
73,914
74,150
74,386
74,622
74,858
75,000
75,094
75,330
75,566
75,802
76,038
76,274
76,511
76,747
76,983
77,219
77,455
77,691
77,927
78,163
78,399
78,635
73,000
0
10
20
30
40
50
60
70
80
90
100
110
Degrees C
8592 Rev E
Update: 12/20/06
Information subject to change without notice
Dexter Research Center • 7300 Huron River Drive • Dexter, MI 48130 • www.DexterResearch.com • +1 734 426 3921
xxv