NTC thermistors for
temperature measurement
Miniature sensors
with bendable wires
Series/Type:
Date:
B57864S
January 2018
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information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement
Miniature sensors with bendable wires
B57864S
S864
Applications
Temperature measurement
Features
Improved resistance to humidity
Short response time
High measuring accuracy
Different tolerances available
Epoxy encapsulation
Insulated leads of silver-plated
nickel wire, AWG 30
Options
Alternative lead lengths on request
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 90 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
25
approx. 1.7
approx. 21
approx. 36
(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
Electrical specification and ordering codes
R
25
Ω
2k
2.8 k
5k
+ = Resistance tolerance
F =
±1%
H =
±3%
No. of R/T
characteristic
1038
8016
8016
B
25/100
K
3560
±1%
3988
±1%
3988
±1%
Ordering code
B57864S0202+041
B57864S0282+040
B57864S0502+040
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 21
Temperature measurement
Miniature sensors with bendable wires
B57864S
S864
Note
This series has a specially designed insulation (coating, wire coating) for improved resistance
against humidity. The sensors must be protected to avoid any damage of the insulation material
during handling and in the application.
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
Endurance
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
P
max
: 60 mW
t: 1000 h
Temperature: 70
°C
t: 10000 h
< 1%
No visible
damage
No visible
damage
No visible
damage
No visible
damage
< 1%
< 3%
< 2%
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 21
Temperature measurement
Miniature sensors with bendable wires
B57864S
S864
Reliability data according to AEC-Q200, Rev. D
Test
High temperature
exposure (storage)
Biased humidity
Standard
MIL-STD-202,
method 108
MIL-STD-202,
method 103
Test conditions
∆R
25
/R
25
(typical)
< 2%
<2%
Remarks
No visible
damage
No visible
damage
Operational life
Temperature
cycling
Terminal strength
(leaded)
Mechanical shock
Storage at T = +125
°C
t = 1000 h
T = 85
°C
Relative humidity of air 85%
t = 1000 h
Test voltage max. 0.3 V DC on
NTC
1)
MIL-STD-202, T = +125
°C
method 108
t = 1000 h
Test voltage max. 0.3 V DC on
NTC
1)
JESD 22,
Lower test temperature: 55
°C
method JA-104 Upper test temperature: 125
°C
1000 cycles
Dwell time: max. 30 min at each
temperature
Transition time in air: max. 1 min
MIL-STD-202, Test leaded device integrity
method 211
Condition A: 2.27 N
2)
MIL-STD-202,
method 213,
condition C
MIL-STD-202,
method 204
Acceleration: 40
g
2)
Pulse duration: 6 ms
Number of bumps: 3, each
direction
Acceleration: 5
g
t = 20 min
12 cycles in each of 3 directions
Frequency range: 10 ... 2000 Hz
< 2%
No visible
damage
< 2%
No visible
damage
< 1%
< 1%
No visible
damage
No visible
damage
Vibration
< 1%
No visible
damage
1) Self heating of the NTC thermistor must not exceed 0.2 K, steady state. Test conditions deviating from AEC-Q200, Rev. D.
2) Deviating from AEC-Q200, Rev. D.
Note
Contact of NTC thermistors with any liquids and solvents shall be prevented. It must be
ensured that no water enters the NTC thermistors (e.g. through plug terminals).
Avoid dewing and condensation unless thermistor is specified for these conditions.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 21
Temperature measurement
Miniature sensors with bendable wires
B57864S
S864
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
1038
8016
B
25/100
= 3560 K
B
25/100
= 3988 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
58.796
42.515
31.095
22.992
17.177
12.960
9.8708
7.5858
5.8799
4.5951
3.6193
2.8720
2.2954
1.8472
1.4962
1.2195
1.0000
0.82472
0.68393
0.57018
0.47777
0.40229
0.34033
0.28920
0.24683
0.21154
0.18203
0.15722
0.13631
0.11861
0.10358
0.090775
0.079839
0.070433
0.062311
0.055278
0.049170
0.043851
0.039207
0.035142
0.031574
0.028435
0.025666
6.6
6.4
6.1
5.9
5.7
5.5
5.4
5.2
5.0
4.9
4.7
4.6
4.4
4.3
4.2
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.7
2.7
2.6
2.5
2.5
2.4
2.4
2.3
2.3
2.2
2.2
2.1
2.1
2.0
96.3
67.01
47.17
33.65
24.26
17.7
13.04
9.707
7.293
5.533
4.232
3.265
2.539
1.99
1.571
1.249
1.0000
0.8057
0.6531
0.5327
0.4369
0.3603
0.2986
0.2488
0.2083
0.1752
0.1481
0.1258
0.1072
0.09177
0.07885
0.068
0.05886
0.05112
0.04454
0.03893
0.03417
0.03009
0.02654
0.02348
0.02083
0.01853
0.01653
7.4
7.2
6.9
6.7
6.4
6.2
6.0
5.8
5.6
5.5
5.3
5.1
5.0
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
3.2
3.1
3.0
2.9
2.9
2.8
2.7
2.6
2.6
2.5
2.5
2.4
2.4
2.3
2.3
Page 5 of 21
Please read
Cautions and warnings
and
Important notes
at the end of this document.
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