NTC thermistors for
temperature measurement
Miniature sensors
with bendable wires
Series/Type:
Date:
B57861S
February 2009
© EPCOS AG 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Temperature measurement
Miniature sensors with bendable wires
B57861S
S861
Applications
Temperature measurement
Features
Short response time
High measuring accuracy
Tight B value tolerances available
Epoxy resin encapsulation
PTFE-insulated leads of silver-plated
nickel wire, AWG 30
UL approval (E69802)
Options
Alternative lead lengths on request
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 60 mg
General technical data
Climatic category
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Thermal cooling time constant
Heat capacity
(IEC 60068-1)
(at 25
°C)
55/155/56
60
±1, ±3, ±5
25
approx. 1.5
approx. 15
approx. 22.5
(in air)
(in air)
P
25
∆R
R
/R
R
T
R
δ
th
τ
c
C
th
mW
%
°C
mW/K
s
mJ/K
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 15
Temperature measurement
Miniature sensors with bendable wires
B57861S
S861
Electrical specification and ordering codes
R
25
Ω
No. of R/T
characteristic
B
25/100
K
Ordering code
B value tolerance = 0.3%, resistance tolerance =
±1%
5k
8016
3988
±0.3%
10 k
8016
3988
±0.3%
30 k
8018
3964
±0.3%
B value tolerance = 1.0%, resistance tolerance =
±1%, ±3%
or
±5%
2k
1008
3560
±1%
3k
8016
3988
±1%
5k
8016
3988
±1%
10 k
8016
3988
±1%
30 k
8018
3964
±1%
50 k
2901
3760
±1%
100 k
2014
4540
±1%
+ = Resistance tolerance
F =
±1%
H =
±3%
J =
±5%
B57861S0502F045
B57861S0103F045
B57861S0303F045
B57861S0202+040
B57861S0302+040
B57861S0502+040
B57861S0103+040
B57861S0303+040
B57861S0503+040
B57861S0104+040
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 2%
Remarks
No visible
damage
Storage in damp
heat, steady state
Rapid temperature
cycling
Long-term stability
(empirical value)
Storage at upper
category temperature
T: 155
°C
t: 1000 h
IEC
Temperature of air: 40
°C
60068-2-78 Relative humidity of air: 93%
Duration: 56 days
IEC
Lower test temperature: 55
°C
60068-2-14 Upper test temperature: 155
°C
Number of cycles: 100
Temperature: 70
°C
t: 10000 h
< 1%
No visible
damage
No visible
damage
No visible
damage
< 1%
< 2%
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 15
Temperature measurement
Miniature sensors with bendable wires
B57861S
S861
R/T characteristics
R/T No.
T (°C)
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
105.0
110.0
115.0
120.0
125.0
130.0
135.0
140.0
145.0
150.0
155.0
1008
2014
2901
B
25/100
= 3560 K
B
25/100
= 4540 K
B
25/100
= 3760 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
53.104
39.318
29.325
22.03
16.666
12.696
9.7251
7.5171
5.8353
4.5686
3.605
2.8665
2.2907
1.8438
1.492
1.2154
1.0000
0.82976
0.68635
0.57103
0.48015
0.40545
0.3417
0.28952
0.24714
0.21183
0.18194
0.1568
0.13592
0.11822
0.1034
0.090741
0.079642
0.070102
0.061889
0.054785
0.048706
0.043415
0.038722
0.034615
0.031048
0.02791
0.025193
6.1
6.0
5.8
5.7
5.5
5.4
5.2
5.1
4.9
4.8
4.7
4.5
4.4
4.3
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.1
3.0
2.9
2.8
2.8
2.7
2.6
2.6
2.5
2.4
2.4
2.3
2.3
2.2
2.2
2.1
2.1
2.0
142
96.615
66.562
46.4
32.708
23.302
16.77
12.186
8.937
6.6125
4.9342
3.712
2.8145
2.15
1.6544
1.2819
1.0000
0.78514
0.62031
0.49304
0.39417
0.3169
0.25616
0.20815
0.17
0.13952
0.11505
0.095302
0.079296
0.066263
0.055601
0.046843
0.039618
0.033634
0.028658
0.024505
0.021026
0.018101
0.015633
0.013544
0.011769
0.010258
0.0089659
7.8
7.6
7.3
7.1
6.9
6.7
6.5
6.3
6.1
5.9
5.8
5.6
5.5
5.3
5.2
5.0
4.9
4.8
4.7
4.5
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.5
3.4
3.3
3.2
3.2
3.1
3.0
3.0
2.9
2.8
2.8
2.7
2.7
63.969
46.179
33.738
24.927
18.611
14.033
10.679
8.198
6.3123
4.9014
3.821
3.0027
2.3801
1.9
1.5257
1.233
1.0000
0.81679
0.67166
0.55527
0.46095
0.38459
0.32184
0.27068
0.22907
0.19468
0.16607
0.14221
0.12218
0.10533
0.09123
0.079284
0.069062
0.06034
0.052886
0.046482
0.040985
0.036233
0.032101
0.02851
0.025373
0.022633
0.020231
6.7
6.4
6.2
6.0
5.8
5.6
5.4
5.3
5.2
5.1
4.9
4.7
4.6
4.5
4.3
4.3
4.1
4.0
3.9
3.8
3.8
3.7
3.6
3.5
3.3
3.2
3.1
3.1
3.0
2.9
2.8
2.8
2.7
2.7
2.6
2.5
2.5
2.5
2.4
2.4
2.3
2.3
2.3
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 15
Temperature measurement
Miniature sensors with bendable wires
B57861S
S861
R/T No.
T (°C)
160.0
165.0
170.0
175.0
180.0
185.0
190.0
195.0
200.0
205.0
210.0
215.0
220.0
225.0
230.0
235.0
240.0
245.0
250.0
1008
2014
2901
B
25/100
= 3560 K
B
25/100
= 4540 K
B
25/100
= 3760 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
0.02279
2.0
0.020667
2.0
0.01878
0.01709
0.015582
0.014227
0.013012
0.011934
0.010964
0.0101
0.0093191
0.0085949
0.0079384
0.0073411
0.006798
0.0063087
0.0058623
0.0054487
0.0050705
1.9
1.9
1.8
1.8
1.8
1.7
1.7
1.7
1.6
1.6
1.6
1.5
1.5
1.5
1.5
1.4
1.4
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 15
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