NTC thermistors for
temperature measurement
Glass-encapsulated sensors,
standard type
Series/Type:
B57540G, B57540G1
Date:
February
2009in this data sheet are being withdrawn.
The following products
presented
Ordering Code
Substitute Product
B57540G0145*
B57540G0234*
B57540G1104*
B57540G1104*
Date of
Withdrawal
2012-03-23
2012-03-23
Deadline Last
Orders
2012-06-28
2012-06-28
Last Shipments
2012-09-28
2012-09-28
For further information please contact your nearest EPCOS sales office, which will also support
you in selecting a suitable substitute. The addresses of our worldwide sales network are
presented at www.epcos.com/sales.
© EPCOS AG 2015. 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
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
Applications
Temperature measurement
Dimensional drawing
Features
Glass-encapsulated, heat-resistive and
highly stable
For temperature measurement up to 250 °C
Very short response time
Small dimensions
Leads: dumet wires (copper-clad FeNi)
Options
Leads: nickel-plated dumet wires
Alternative dimensions available on request
Dimensions in mm
Delivery mode
Bulk
General technical data
Climatic category
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Thermal cooling time constant
Heat capacity
Please read Cautions and warnings and
Important notes at the end of this document.
(IEC 60068-1)
(at 25 °C)
(in air)
(in air)
P25
∆RR/RR
TR
δth
τc
Cth
Page 2 of 18
55/250/56
18
±1, ±2, ±3
25
approx. 0.4
approx. 3
approx. 1.3
mW
%
°C
mW/K
s
mJ/K
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
Electrical specification and ordering codes
R25
Ω
5k
5k
10 k
10 k
10 k
10 k
20 k
20 k
30 k
30 k
50 k
50 k
100 k
100 k
230 k
230 k
1400 k
1400 k
No. of R/T
characteristic
8402
8402
7003
7003
8307
8307
8415
8415
7002
7002
8403
8403
8304
8304
8405
8405
8406
8406
B25/85
K
3480
3480
3612
3612
3478
3478
3992
3992
3973
3973
3992
3992
4072
4072
4240
4240
4557
4557
B0/100
K
3450 ±1%
3450 ±1%
3586
3586
3450
3450
3970 ±1%
3970 ±1%
3944
3944
3970 ±1%
3970 ±1%
4036
4036
4537 ±2%1)
4537 ±2%1)
5133 ±2%2)
5133 ±2%2)
+ = Resistance tolerance
F = ±1%
G = ±2%
H = ±3%
The last three digits of the ordering code denote:
000 and 005 = dumet wires
002 and 007 = nickel-plated wires
1) B100/200
2) B200/300
Please read Cautions and warnings and
Important notes at the end of this document.
Page 3 of 18
B25/100
K
3497
3497
3625 ±1%
3625 ±1%
3492 ±1%
3492 ±1%
4006
4006
3988 ±1%
3988 ±1%
4006
4006
4092 ±1%
4092 ±1%
4264
4264
4581
4581
Ordering code
B57540G0502+000
B57540G0502+002
B57540G1103+005
B57540G1103+007
B57540G1103+000
B57540G1103+002
B57540G0203+000
B57540G0203+002
B57540G1303+005
B57540G1303+007
B57540G0503+000
B57540G0503+002
B57540G1104+000
B57540G1104+002
B57540G0234+000
B57540G0234+002
B57540G0145+000
B57540G0145+002
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
Reliability data
Test
Standard
Storage in
dry heat
IEC
60068-2-2
Storage in damp
heat, steady state
Rapid temperature
cycling
Test conditions
Storage at upper
category temperature
T: 250 °C
t: 1000 h
IEC
Temperature of air: 85 °C
60068-2-67 Relative humidity of air: 85%
Duration: 56 days
IEC
Lower test temperature: 55 °C
60068-2-14 Upper test temperature: 200 °C
Number of cycles: 1000
Please read Cautions and warnings and
Important notes at the end of this document.
Page 4 of 18
∆R25/R25
(typical)
< 3%
Remarks
< 2%
No visible
damage
< 2%
No visible
damage
No visible
damage
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
R/T characteristics
R/T No.
T (°C)
7002
7003
8304
B25/100 = 3988 K
B25/100 = 3625 K
B25/100 = 4092 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
96.33
66.866
47.037
33.508
24.156
7.4
7.2
6.9
6.7
6.4
63.225
45.46
33.07
24.324
18.081
6.7
6.5
6.3
6.0
5.8
30.0
25.0
20.0
15.0
10.0
17.613
12.98
9.6643
7.2656
5.5129
6.2
6.0
5.8
5.6
5.4
13.575
10.29
7.8716
6.0739
4.7258
5.6
5.4
5.3
5.1
4.9
18.275
13.443
9.9853
7.4867
5.6636
6.2
6.0
5.9
5.7
5.5
5.0
0.0
5.0
10.0
15.0
4.22
3.2575
2.5348
1.9876
1.5699
5.3
5.1
4.9
4.8
4.6
3.7062
2.9287
2.3311
1.8684
1.5075
4.8
4.6
4.5
4.4
4.2
4.3212
3.324
2.5769
2.0127
1.5834
5.3
5.2
5.0
4.9
4.7
20.0
25.0
30.0
35.0
40.0
1.2488
1.0000
0.80594
0.65355
0.53312
4.5
4.4
4.3
4.1
4.0
1.224
1.0000
0.82176
0.67909
0.56422
4.1
4.0
3.9
3.8
3.7
1.2542
1.0000
0.80239
0.64776
0.52598
4.6
4.5
4.3
4.2
4.1
45.0
50.0
55.0
60.0
65.0
0.43735
0.36074
0.29911
0.24925
0.20872
3.9
3.8
3.7
3.6
3.5
0.47122
0.3955
0.33355
0.2826
0.24049
3.6
3.5
3.4
3.3
3.2
0.4295
0.35262
0.291
0.24136
0.20114
4.0
3.9
3.8
3.7
3.6
70.0
75.0
80.0
85.0
90.0
0.17558
0.14837
0.12592
0.10731
0.091816
3.4
3.3
3.2
3.2
3.1
0.20553
0.17637
0.15195
0.13141
0.11406
3.1
3.0
2.9
2.9
2.8
0.16841
0.14164
0.11963
0.10147
0.086407
3.5
3.4
3.3
3.3
3.2
95.0
100.0
105.0
110.0
115.0
0.078862
0.067988
0.058824
0.051071
0.044489
3.0
2.9
2.9
2.8
2.7
0.099352
0.086837
0.076149
0.066989
0.059112
2.7
2.7
2.6
2.5
2.5
0.073867
0.063383
0.054584
0.04717
0.040901
3.1
3.0
3.0
2.9
2.8
120.0
125.0
130.0
135.0
140.0
0.03888
0.034084
0.02997
0.02643
0.023373
2.7
2.6
2.5
2.5
2.4
0.052316
0.046433
0.041327
0.03688
0.032998
2.4
2.4
2.3
2.3
2.2
0.035581
0.03105
0.027179
0.023861
0.021008
2.8
2.7
2.6
2.6
2.5
145.0
150.0
155.0
0.020727
0.018429
0.016427
2.4
2.3
2.3
0.029598
0.026612
0.023984
2.2
2.1
2.1
0.018548
0.016419
0.014573
2.5
2.4
2.4
Please read Cautions and warnings and
Important notes at the end of this document.
Page 5 of 18
100.11
69.56
48.945
34.853
25.102
7.4
7.2
6.9
6.7
6.5
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
R/T No.
T (°C)
160.0
165.0
7002
G540/G1540
7003
8304
B25/100 = 3988 K
B25/100 = 3625 K
B25/100 = 4092 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
0.014679
2.2
0.021665
2.0
0.012967
2.3
0.013149
2.2
0.019613
2.0
0.011566
2.3
170.0
175.0
180.0
185.0
190.0
0.011806
0.010623
0.0095804
0.0086582
0.0078408
2.1
2.1
2.0
2.0
2.0
0.017793
0.016176
0.014735
0.013448
0.012297
1.9
1.9
1.8
1.8
1.8
0.010341
0.0092664
0.0083224
0.0074907
0.0067564
2.2
2.2
2.1
2.1
2.0
195.0
200.0
205.0
210.0
215.0
0.0071148
0.0064685
0.005892
0.0053767
0.0049152
1.9
1.9
1.8
1.8
1.8
0.011265
0.010338
0.009504
0.0087516
0.0080718
1.7
1.7
1.7
1.6
1.6
0.0061064
0.0055299
0.0050175
0.0045611
0.0041537
2.0
2.0
1.9
1.9
1.9
220.0
225.0
230.0
235.0
240.0
0.0045011
0.0041287
0.0037934
0.0034908
0.0032173
1.7
1.7
1.7
1.6
1.6
0.0074567
0.0068989
0.0063925
0.0059318
0.005512
1.6
1.5
1.5
1.5
1.5
0.0037895
0.0034631
0.0031701
0.0029067
0.0026693
1.8
1.8
1.8
1.7
1.7
245.0
250.0
255.0
260.0
265.0
0.0029697
0.0027451
0.0025412
0.0023556
0.0021865
1.6
1.6
1.5
1.5
1.5
0.005129
0.004779
0.0044586
0.004165
0.0038955
1.4
1.4
1.4
1.4
1.3
0.0024551
0.0022615
0.0020862
0.0019273
0.0017829
1.7
1.6
1.6
1.6
1.5
270.0
275.0
280.0
285.0
290.0
0.0020323
0.0018913
0.0017623
0.0016441
0.0015357
1.5
1.4
1.4
1.4
1.4
0.0036478
0.0034199
0.0032098
0.003016
0.002837
1.3
1.3
1.3
1.2
1.2
0.0016516
0.0015319
0.0014228
0.0013231
0.0012319
1.5
1.5
1.5
1.4
1.4
295.0
300.0
0.001436
0.0013444
1.3
1.3
0.0026714
0.002518
1.2
1.2
0.0011483
0.0010716
1.4
1.4
Please read Cautions and warnings and
Important notes at the end of this document.
Page 6 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
R/T characteristics
R/T No.
T (°C)
8307
8402
8403
B25/100 = 3492 K
B0/100 = 3450 K
B0/100 = 3970 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
52.624
38.452
28.401
21.194
15.972
6.4
6.2
6.0
5.8
5.6
51.991
37.989
28.07
20.96
15.809
6.4
6.2
5.9
5.7
5.5
30.0
25.0
20.0
15.0
10.0
12.149
9.3246
7.2181
5.6332
4.4308
5.4
5.2
5.0
4.9
4.7
12.037
9.2484
7.1668
5.5993
4.4087
5.4
5.2
5.0
4.9
4.7
18.245
13.383
9.9221
7.4316
5.6202
6.3
6.1
5.9
5.7
5.5
5.0
0.0
5.0
10.0
15.0
3.5112
2.8024
2.252
1.8216
1.4827
4.6
4.4
4.3
4.2
4.1
3.4971
2.7936
2.2468
1.8187
1.4813
4.6
4.4
4.3
4.2
4.0
4.2894
3.3024
2.5607
2.0017
1.5768
5.3
5.2
5.0
4.8
4.7
20.0
25.0
30.0
35.0
40.0
1.2142
1.0000
0.82818
0.68954
0.57703
3.9
3.8
3.7
3.6
3.5
1.2136
1.0000
0.82845
0.68991
0.57742
3.9
3.8
3.7
3.6
3.5
1.2513
1.0000
0.80451
0.65139
0.53064
4.6
4.4
4.3
4.2
4.0
45.0
50.0
55.0
60.0
65.0
0.48525
0.41
0.34798
0.29663
0.25392
3.4
3.3
3.2
3.2
3.1
0.4856
0.41026
0.34816
0.29673
0.25393
3.4
3.3
3.2
3.2
3.1
0.43481
0.35828
0.29681
0.24715
0.20682
3.9
3.8
3.7
3.6
3.5
70.0
75.0
80.0
85.0
90.0
0.21824
0.1883
0.16307
0.14174
0.12362
3.0
2.9
2.8
2.8
2.7
0.21817
0.18816
0.16288
0.1415
0.12335
3.0
2.9
2.8
2.8
2.7
0.17389
0.14687
0.12459
0.10614
0.09078
3.4
3.3
3.2
3.2
3.1
95.0
100.0
105.0
110.0
115.0
0.10818
0.094973
0.08364
0.073881
0.06545
2.6
2.6
2.5
2.5
2.4
0.10788
0.094659
0.083313
0.073547
0.065114
2.6
2.6
2.5
2.5
2.4
0.077949
0.067183
0.058113
0.050443
0.043932
3.0
2.9
2.9
2.8
2.7
120.0
125.0
130.0
135.0
140.0
0.058144
0.051794
0.046259
0.04142
0.037179
2.3
2.3
2.2
2.2
2.1
0.05781
0.051464
0.045936
0.041106
0.036875
2.4
2.3
2.2
2.2
2.1
0.038386
0.033645
0.029579
0.02608
0.02306
2.7
2.6
2.5
2.5
2.4
145.0
150.0
155.0
0.033451
0.030166
0.027264
2.1
2.0
2.0
0.033159
0.029886
0.026998
2.1
2.1
2.0
0.020446
0.018176
0.016199
2.4
2.3
2.3
Please read Cautions and warnings and
Important notes at the end of this document.
Page 7 of 18
103.29
71.079
49.619
35.108
25.158
7.6
7.3
7.1
6.8
6.5
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
R/T No.
T (°C)
160.0
165.0
8307
G540/G1540
8402
8403
B25/100 = 3492 K
B0/100 = 3450 K
B0/100 = 3970 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
0.024694
2.0
0.024442
2.0
0.014473
2.2
0.022414
1.9
0.022175
1.9
0.012962
2.2
170.0
175.0
180.0
185.0
190.0
0.020385
0.018577
0.016961
0.015514
0.014216
1.9
1.8
1.8
1.8
1.7
0.02016
0.018365
0.016762
0.015328
0.014043
1.9
1.8
1.8
1.8
1.7
0.011636
0.010469
0.0094395
0.0085294
0.0077229
2.1
2.1
2.0
2.0
2.0
195.0
200.0
205.0
210.0
215.0
0.013049
0.011999
0.011051
0.010194
0.0094181
1.7
1.7
1.6
1.6
1.6
0.012888
0.011849
0.010913
0.010067
0.0093013
1.7
1.7
1.6
1.6
1.6
0.0070067
0.0063691
0.0058005
0.0052924
0.0048373
1.9
1.9
1.9
1.8
1.8
220.0
225.0
230.0
235.0
240.0
0.0087144
0.0080751
0.0074933
0.0069631
0.0064791
1.5
1.5
1.5
1.5
1.4
0.0086075
0.0079777
0.007405
0.0068833
0.0064075
1.5
1.5
1.5
1.4
1.4
0.004429
0.004062
0.0037315
0.0034333
0.0031639
1.7
1.7
1.7
1.6
1.6
245.0
250.0
255.0
260.0
265.0
0.0060366
0.0056316
0.0052602
0.0049193
0.0046059
1.4
1.4
1.4
1.3
1.3
0.0059728
0.0055751
0.0052107
0.0048764
0.0045692
1.4
1.4
1.3
1.3
1.3
0.00292
0.0026988
0.002498
0.0023153
0.0021489
1.6
1.6
1.5
1.5
1.5
270.0
275.0
280.0
285.0
290.0
0.0043173
0.0040514
0.003806
0.0035793
0.0033696
1.3
1.3
1.2
1.2
1.2
0.0042866
0.0040263
0.0037862
0.0035645
0.0033595
1.3
1.2
1.2
1.2
1.2
0.0019971
0.0018584
0.0017316
0.0016153
0.0015087
1.5
1.4
1.4
1.4
1.4
295.0
300.0
0.0031753
0.0029952
1.2
1.2
0.0031697
0.0029938
1.2
1.1
0.0014107
0.0013207
1.3
1.3
Please read Cautions and warnings and
Important notes at the end of this document.
Page 8 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
R/T characteristics
R/T No.
T (°C)
55.0
50.0
45.0
40.0
35.0
8405
8406
8415
B100/200 = 4537 K
B200/300 = 5133 K
B0/100 = 3970 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
122.12
83.306
57.62
40.378
28.647
7.8
7.5
7.2
7.0
6.7
183.3
120.69
80.721
54.792
37.713
8.5
8.2
7.9
7.6
7.3
103.29
71.079
49.619
35.108
25.158
7.6
7.3
7.1
6.8
6.5
30.0
25.0
20.0
15.0
10.0
20.563
14.925
10.947
8.1101
6.0655
6.5
6.3
6.1
5.9
5.7
26.301
18.571
13.269
9.5865
6.9997
7.1
6.8
6.6
6.4
6.2
18.245
13.383
9.9221
7.4316
5.6202
6.3
6.1
5.9
5.7
5.5
5.0
0.0
5.0
10.0
15.0
4.5776
3.4845
2.6743
2.0686
1.6121
5.5
5.4
5.2
5.1
4.9
5.1625
3.844
2.8884
2.1892
1.673
6.0
5.8
5.6
5.5
5.3
4.2894
3.3024
2.5607
2.0017
1.5768
5.3
5.2
5.0
4.8
4.7
20.0
25.0
30.0
35.0
40.0
1.2654
1.0000
0.79548
0.63677
0.51279
4.8
4.6
4.5
4.4
4.3
1.2886
1.0000
0.78164
0.61516
0.48734
5.1
5.0
4.9
4.7
4.6
1.2513
1.0000
0.80451
0.65139
0.53064
4.6
4.4
4.3
4.2
4.0
45.0
50.0
55.0
60.0
65.0
0.41534
0.33828
0.27698
0.22795
0.18853
4.2
4.1
3.9
3.8
3.7
0.38851
0.3116
0.25136
0.2039
0.16629
4.5
4.4
4.2
4.1
4.0
0.43481
0.35828
0.29681
0.24715
0.20682
3.9
3.8
3.7
3.6
3.5
70.0
75.0
80.0
85.0
90.0
0.15666
0.13077
0.10964
0.092319
0.078049
3.7
3.6
3.5
3.4
3.3
0.1363
0.11228
0.092932
0.077268
0.064527
3.9
3.8
3.7
3.6
3.6
0.17389
0.14687
0.12459
0.10614
0.09078
3.4
3.3
3.2
3.2
3.1
95.0
100.0
105.0
110.0
115.0
0.066244
0.056439
0.048262
0.041416
0.035663
3.2
3.2
3.1
3.0
3.0
0.054116
0.045571
0.038526
0.032694
0.027847
3.5
3.4
3.3
3.2
3.2
0.077949
0.067183
0.058113
0.050443
0.043932
3.0
2.9
2.9
2.8
2.7
120.0
125.0
130.0
135.0
140.0
0.030811
0.026705
0.023218
0.020247
0.017707
2.9
2.8
2.8
2.7
2.7
0.023803
0.020416
0.017569
0.015167
0.013135
3.1
3.0
3.0
2.9
2.8
0.038386
0.033645
0.029579
0.02608
0.02306
2.7
2.6
2.5
2.5
2.4
145.0
150.0
155.0
0.01553
0.013658
0.012043
2.6
2.5
2.5
0.011409
0.0099385
0.0086821
2.8
2.7
2.7
0.020446
0.018176
0.016199
2.4
2.3
2.3
Please read Cautions and warnings and
Important notes at the end of this document.
Page 9 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
R/T No.
T (°C)
160.0
165.0
8405
G540/G1540
8406
8415
B100/200 = 4537 K
B200/300 = 5133 K
B0/100 = 3970 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
0.010647
2.4
0.0076052 2.6
0.014473
2.2
0.009436
2.4
0.0066796 2.6
0.012962
2.2
170.0
175.0
180.0
185.0
190.0
0.0083831
0.0074652
0.006663
0.0059602
0.0053431
2.3
2.3
2.3
2.2
2.2
0.0058817
0.005192
0.0045943
0.0040749
0.0036225
2.5
2.5
2.4
2.4
2.3
0.011636
0.010469
0.0094395
0.0085294
0.0077229
2.1
2.1
2.0
2.0
2.0
195.0
200.0
205.0
210.0
215.0
0.0047999
0.0043208
0.0038972
0.0035219
0.0031888
2.1
2.1
2.0
2.0
2.0
0.0032274
0.0028817
0.0025783
0.0023116
0.0020766
2.3
2.2
2.2
2.2
2.1
0.0070067
0.0063691
0.0058005
0.0052924
0.0048373
1.9
1.9
1.9
1.8
1.8
220.0
225.0
230.0
235.0
240.0
0.0028925
0.0026284
0.0023925
0.0021816
0.0019925
1.9
1.9
1.9
1.8
1.8
0.0018691
0.0016854
0.0015226
0.001378
0.0012492
2.1
2.0
2.0
2.0
1.9
0.004429
0.004062
0.0037315
0.0034333
0.0031639
1.7
1.7
1.7
1.6
1.6
245.0
250.0
255.0
260.0
265.0
0.0018227
0.00167
0.0015324
0.0014083
0.0012961
1.8
1.7
1.7
1.7
1.6
0.0011344
0.0010318
0.00094005
0.00085777
0.00078388
1.9
1.9
1.8
1.8
1.8
0.00292
0.0026988
0.002498
0.0023153
0.0021489
1.6
1.6
1.5
1.5
1.5
270.0
275.0
280.0
285.0
290.0
0.0011946
0.0011025
0.0010189
0.00094294
0.00087373
1.6
1.6
1.6
1.5
1.5
0.00071742
0.00065754
0.00060352
0.0005547
0.00051051
1.8
1.7
1.7
1.7
1.6
0.0019971
0.0018584
0.0017316
0.0016153
0.0015087
1.5
1.4
1.4
1.4
1.4
295.0
300.0
0.00081063 1.5
0.00075301 1.5
0.00047047 1.6
0.00043412 1.6
0.0014107
0.0013207
1.3
1.3
Please read Cautions and warnings and
Important notes at the end of this document.
Page 10 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
Mounting instructions
1
Soldering
1.1
Leaded NTC thermistors
Leaded thermistors comply with the solderability requirements specified by CECC.
When soldering, care must be taken that the NTC thermistors are not damaged by excessive
heat. The following maximum temperatures, maximum time spans and minimum distances have
to be observed:
Dip soldering
Iron soldering
Bath temperature
max. 260 °C
max. 360 °C
Soldering time
max. 4 s
max. 2 s
Distance from thermistor
min. 6 mm
min. 6 mm
Under more severe soldering conditions the resistance may change.
1.2
Leadless NTC thermistors
In case of NTC thermistors without leads, soldering is restricted to devices which are provided
with a solderable metallization. The temperature shock caused by the application of hot solder
may produce fine cracks in the ceramic, resulting in changes in resistance.
To prevent leaching of the metallization, solder with silver additives or with a low tin content
should be used. In addition, soldering methods should be employed which permit short soldering
times.
2
Clamp contacting
Pressure contacting by means of clamps is particularly suitable for applications involving frequent
switching and high turn-on powers.
3
Robustness of terminations (leaded types)
The leads meet the requirements of IEC 60068-2-21. They may not be bent closer than 4 mm
from the solder joint on the thermistor body or from the point at which they leave the feedthroughs. During bending, any mechanical stress at the outlet of the leads must be removed. The
bending radius should be at least 0.75 mm.
Tensile strength:
Test Ua1:
Leads
0.25 <
0.35 <
0.50 <
0.80 <
Please read Cautions and warnings and
Important notes at the end of this document.
∅ ≤0.25 mm = 1.0 N
∅ ≤0.35 mm = 2.5 N
∅ ≤0.50 mm = 5.0 N
∅ ≤0.80 mm = 10.0 N
∅ ≤1.25 mm = 20.0 N
Page 11 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
Bending strength: Test Ub:
Two 90°-bends in opposite directions at a weight of 0.25 kg.
Torsional strength: Test Uc: severity 2
The lead is bent by 90° at a distance of 6 to 6.5 mm from the thermistor body.
The bending radius of the leads should be approx. 0.75 mm. Two torsions of
180° each (severity 2).
When subjecting leads to mechanical stress, the following should be observed:
Tensile stress on leads
During mounting and operation tensile forces on the leads are to be avoided.
Bending of leads
Bending of the leads directly on the thermistor body is not permissible.
A lead may be bent at a minimum distance of twice the wire's diameter +2 mm from the solder
joint on the thermistor body. During bending the wire must be mechanically relieved at its outlet.
The bending radius should be at least 0.75 mm.
Twisting of leads
The twisting (torsion) by 180° of a lead bent by 90° is permissible at 6 mm from the bottom of the
thermistor body.
4
Sealing and potting
When thermistors are sealed, potted or overmolded, there must be no mechanical stress caused
by thermal expansion during the production process (curing / overmolding process) and during
later operation. The upper category temperature of the thermistor must not be exceeded. Ensure
that the materials used (sealing / potting compound and plastic material) are chemically neutral.
5
Cleaning
If cleaning is necessary, mild cleaning agents such as ethyl alcohol and cleaning gasoline are
recommended. Cleaning agents based on water are not allowed. Ultrasonic cleaning methods are
permissible.
6
Storage
In order to maintain their solderability, thermistors must be stored in a non-corrosive atmosphere.
Humidity, temperature and container materials are critical factors.
Do not store SMDs where they are exposed to heat or direct sunlight. Otherwise, the packing material may be deformed or SMDs may stick together, causing problems during mounting. After
opening the factory seals, such as polyvinyl-sealed packages, use the SMDs as soon as possible.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 12 of 18
Temperature measurement
B57540G, B57540G1
Glass-encapsulated sensors
G540/G1540
The components should be left in the original packing. Touching the metallization of unsoldered
thermistors may change their soldering properties.
Storage temperature:
25 °C up to 45 °C
Relative humidity (without condensation):
≤75% annual mean
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