NTC thermistors for
temperature measurement
Probe assemblies
Series/Type:
Date:
B57045K
January 2018
© EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement
Probe assemblies
B57045K
K45
Applications
Temperature compensation, measurement
and control (chassis mounting)
Features
Cost-effective
Good thermal coupling through screw-type
case (thread M3)
Electrically isolated aluminum case
Tinned copper leads
Options
Tighter resistance tolerance available on
request.
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 1 g
General technical data
Climatic category
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Dissipation factor
Thermal cooling time constant
Thermal cooling time constant
Torque
Insulation resistance
Test voltage
(IEC 60068-1)
(at 25
°C)
55/125/56
450
±10
25
approx. 9
approx. 20
approx. 75
approx. 15
approx. 0.5
> 100
2500
(in air)
(on chassis)
(in air)
(on chassis)
(V = 100 V DC)
(t = 1 s)
P
25
∆R
R
/R
R
T
R
δ
th
δ
th
τ
c
τ
c
R
ins
V
test
mW
%
°C
mW/K
mW/K
s
s
Nm
MΩ
V AC
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 14
Temperature measurement
Probe assemblies
B57045K
K45
Electrical specification and ordering codes
R
25
Ω
1k
2.2 k
4.7 k
6.8 k
10 k
33 k
47 k
68 k
100 k
150 k
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 3%
Remarks
No visible
damage
No. of R/T
characteristic
1011
1013
4001
2903
2904
1012
4003
2005
2005
2005
B
25/100
K
3730
±3%
3900
±3%
3950
±3%
4200
±3%
4300
±3%
4300
±3%
4450
±3%
4600
±3%
4600
±3%
4600
±3%
Ordering code
B57045K0102K000
B57045K0222K000
B57045K0472K000
B57045K0682K000
B57045K0103K000
B57045K0333K000
B57045K0473K000
B57045K0683K000
B57045K0104K000
B57045K0154K000
Storage in damp
heat, steady state
Endurance
Long-term stability
(empirical value)
Note
Storage at upper
category temperature
T: 125
°C
t: 1000 h
IEC
Temperature of air: 40
°C
60068-2-78 Relative humidity of air: 93%
Duration: 56 days
P
max
: 450 mW
t: 1000 h
Temperature: 100
°C
t: 10000 h
< 3%
No visible
damage
No visible
damage
No visible
damage
< 3%
< 5%
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 3 of 14
Temperature measurement
Probe assemblies
B57045K
K45
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
1011
1012
1013
B
25/100
= 3730 K
B
25/100
= 4300 K
B
25/100
= 3900 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
70.014
49.906
36.015
26.296
19.411
14.479
10.903
8.2923
6.3591
4.9204
3.8279
3.0029
2.3773
1.8959
1.5207
1.228
1.0000
0.81779
0.67341
0.55747
0.46357
0.3874
0.32368
0.272
0.23041
0.19604
0.16735
0.14342
0.12347
0.10668
0.092734
0.080903
0.070616
0.061826
0.054282
0.047793
0.042249
6.9
6.7
6.4
6.2
6.0
5.8
5.6
5.4
5.2
5.1
4.9
4.8
4.6
4.5
4.3
4.2
4.1
3.9
3.8
3.7
3.6
3.6
3.5
3.4
3.3
3.2
3.1
3.0
3.0
2.8
2.8
2.8
2.7
2.6
2.6
2.5
2.4
87.237
62.264
44.854
32.599
23.893
17.654
13.098
9.8059
7.4266
5.6677
4.3213
3.3208
2.5842
2.0238
1.5858
1.2507
1.0000
0.7964
0.64053
0.51772
0.41958
0.34172
0.27877
0.22861
0.18872
0.15645
0.13012
0.10863
0.091115
0.0767
0.064867
0.055047
0.046797
0.039904
0.034255
0.029498
0.025448
6.8
6.7
6.5
6.3
6.1
6.0
5.8
5.7
5.5
5.4
5.3
5.1
5.0
4.9
4.8
4.7
4.5
4.4
4.3
4.2
4.1
4.1
4.0
3.9
3.8
3.7
3.6
3.6
3.5
3.4
3.3
3.3
3.2
3.1
3.1
3.0
3.0
77.285
54.938
39.507
28.722
21.099
15.652
11.715
8.8541
6.7433
5.1815
4.0099
3.1283
2.4569
1.9438
1.5475
1.2403
1.0000
0.81104
0.66146
0.54254
0.44727
0.37067
0.30865
0.25825
0.21707
0.18323
0.15535
0.13223
0.11302
0.096951
0.083487
0.072139
0.062559
0.054425
0.047508
0.041594
0.036532
7.0
6.7
6.5
6.3
6.1
5.9
5.7
5.6
5.4
5.2
5.1
4.9
4.8
4.6
4.5
4.4
4.3
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.8
2.7
2.6
2.6
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 14
Temperature measurement
Probe assemblies
B57045K
K45
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
2005
2903
2904
B
25/100
= 4600 K
B
25/100
= 4200 K
B
25/100
= 4300 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
120.22
85.48
61.004
43.712
31.459
22.746
16.49
12.071
8.8455
6.5446
4.8852
3.6781
2.7944
2.1391
1.6507
1.2823
1.0000
0.78393
0.61822
0.49053
0.39116
0.31371
0.25338
0.20565
0.16762
0.13726
0.11279
0.093053
0.077177
0.064263
0.053678
0.044996
0.037917
0.032063
0.027161
0.023079
0.01968
7.0
6.9
6.8
6.7
6.6
6.6
6.4
6.3
6.1
6.0
5.8
5.6
5.4
5.3
5.1
5.1
5.0
4.8
4.7
4.6
4.5
4.3
4.2
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.6
3.5
3.4
3.4
3.3
3.2
3.2
120.03
82.38
57.248
40.255
28.627
20.577
14.876
10.88
8.0808
6.0612
4.5649
3.4708
2.6625
2.0599
1.6069
1.2631
1.0000
0.79593
0.63796
0.51467
0.41887
0.34272
0.28081
0.23141
0.19211
0.16027
0.13421
0.11288
0.095326
0.080828
0.068916
0.058989
0.050701
0.043735
0.037778
0.032736
0.028513
7.7
7.4
7.2
7.0
6.7
6.6
6.4
6.1
5.9
5.8
5.6
5.4
5.2
5.1
4.9
4.8
4.6
4.5
4.4
4.2
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
3.0
2.9
2.8
2.7
121.46
84.439
59.243
41.938
29.947
21.567
15.641
11.466
8.451
6.2927
4.7077
3.5563
2.7119
2.086
1.6204
1.2683
1.0000
0.7942
0.63268
0.5074
0.41026
0.33363
0.27243
0.2237
0.18459
0.15305
0.12755
0.10677
0.089928
0.076068
0.064524
0.054941
0.047003
0.040358
0.034743
0.030007
0.026006
0.022609
0.01972
0.017251
0.015139
0.013321
0.011754
Page 5 of 14
7.4
7.2
7.1
6.9
6.7
6.6
6.3
6.2
6.0
5.9
5.7
5.5
5.3
5.1
5.0
4.8
4.7
4.6
4.5
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.8
2.7
2.6
2.6
2.5
2.5
Please read
Cautions and warnings
and
Important notes
at the end of this document.
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