Page 1
NTC thermistors for
temperature measurement
Glass-encapsulated sensors,
standard type
Series/Type: B57540G, B57540G1
Date: February 2009
The following products presented in this data sheet are being withdrawn.
Ordering Code Substitute Product Date of
B57540G0145* B57540G1104* 2012-03-23 2012-06-28 2012-09-28
B57540G0234* B57540G1104* 2012-03-23 2012-06-28 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 2009. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Withdrawal
Deadline Last
Orders
Last Shipments
Page 2
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Applications
Dimensional drawing
Temperature measurement
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
Delivery mode
Dimensions in mm
Bulk
General technical data
Climatic category (IEC 60068-1) 55/250/56
Max. power (at 25 °C) P
18 mW
25
Resistance tolerance ∆RR/RR±1, ±2, ±3 %
Rated temperature T
Dissipation factor (in air) δ
Thermal cooling time constant (in air) τ
Heat capacity C
th
c
25 °C
R
approx. 0.4 mW/K
approx. 3 s
approx. 1.3 mJ/K
th
Important notes at the end of this document.
Page 2 of 18Please read Cautions and warnings and
Page 3
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Electrical specification and ordering codes
R
25
Ω
No. of R/T
characteristic
B
25/85
K
B
0/100
K
B
K
25/100
Ordering code
5 k 8402 3480 3450 ±1% 3497 B57540G0502+000
5 k 8402 3480 3450 ±1% 3497 B57540G0502+002
10 k 7003 3612 3586 3625 ±1% B57540G1103+005
10 k 7003 3612 3586 3625 ±1% B57540G1103+007
10 k 8307 3478 3450 3492 ±1% B57540G1103+000
10 k 8307 3478 3450 3492 ±1% B57540G1103+002
20 k 8415 3992 3970 ±1% 4006 B57540G0203+000
20 k 8415 3992 3970 ±1% 4006 B57540G0203+002
30 k 7002 3973 3944 3988 ±1% B57540G1303+005
30 k 7002 3973 3944 3988 ±1% B57540G1303+007
50 k 8403 3992 3970 ±1% 4006 B57540G0503+000
50 k 8403 3992 3970 ±1% 4006 B57540G0503+002
100 k 8304 4072 4036 4092 ±1% B57540G1104+000
100 k 8304 4072 4036 4092 ±1% B57540G1104+002
230 k 8405 4240 4537 ±2%1)4264 B57540G0234+000
230 k 8405 4240 4537 ±2%1)4264 B57540G0234+002
1400 k 8406 4557 5133 ±2%2)4581 B57540G0145+000
1400 k 8406 4557 5133 ±2%2)4581 B57540G0145+002
+ = 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) B
100/200
2) B
200/300
Important notes at the end of this document.
Page 3 of 18Please read Cautions and warnings and
Page 4
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Reliability data
Test Standard Test conditions ∆R25/R
(typical)
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
< 3% No visible
T: 250 °C
t: 1000 h
Storage in damp
heat, steady state
IEC
60068-2-67
Temperature of air: 85 °C
Relative humidity of air: 85%
< 2% No visible
Duration: 56 days
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature: 55 °C
Upper test temperature: 200 °C
< 2% No visible
Number of cycles: 1000
Remarks
25
damage
damage
damage
Important notes at the end of this document.
Page 4 of 18Please read Cautions and warnings and
Page 5
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T characteristics
R/T No.
T (°C) B
7002 7003 8304
= 3988 K B
25/100
RT/R
25
α (%/K) RT/R
= 3625 K B
25/100
25
25/100
α (%/K) RT/R
= 4092 K
25
55.0 96.33 7.4 63.225 6.7 100.11 7.4
50.0 66.866 7.2 45.46 6.5 69.56 7.2
45.0 47.037 6.9 33.07 6.3 48.945 6.9
40.0 33.508 6.7 24.324 6.0 34.853 6.7
35.0 24.156 6.4 18.081 5.8 25.102 6.5
30.0 17.613 6.2 13.575 5.6 18.275 6.2
25.0 12.98 6.0 10.29 5.4 13.443 6.0
20.0 9.6643 5.8 7.8716 5.3 9.9853 5.9
15.0 7.2656 5.6 6.0739 5.1 7.4867 5.7
10.0 5.5129 5.4 4.7258 4.9 5.6636 5.5
5.0 4.22 5.3 3.7062 4.8 4.3212 5.3
0.0 3.2575 5.1 2.9287 4.6 3.324 5.2
5.0 2.5348 4.9 2.3311 4.5 2.5769 5.0
10.0 1.9876 4.8 1.8684 4.4 2.0127 4.9
15.0 1.5699 4.6 1.5075 4.2 1.5834 4.7
20.0 1.2488 4.5 1.224 4.1 1.2542 4.6
25.0 1.0000 4.4 1.0000 4.0 1.0000 4.5
30.0 0.80594 4.3 0.82176 3.9 0.80239 4.3
35.0 0.65355 4.1 0.67909 3.8 0.64776 4.2
40.0 0.53312 4.0 0.56422 3.7 0.52598 4.1
45.0 0.43735 3.9 0.47122 3.6 0.4295 4.0
50.0 0.36074 3.8 0.3955 3.5 0.35262 3.9
55.0 0.29911 3.7 0.33355 3.4 0.291 3.8
60.0 0.24925 3.6 0.2826 3.3 0.24136 3.7
65.0 0.20872 3.5 0.24049 3.2 0.20114 3.6
70.0 0.17558 3.4 0.20553 3.1 0.16841 3.5
75.0 0.14837 3.3 0.17637 3.0 0.14164 3.4
80.0 0.12592 3.2 0.15195 2.9 0.11963 3.3
85.0 0.10731 3.2 0.13141 2.9 0.10147 3.3
90.0 0.091816 3.1 0.11406 2.8 0.086407 3.2
95.0 0.078862 3.0 0.099352 2.7 0.073867 3.1
100.0 0.067988 2.9 0.086837 2.7 0.063383 3.0
105.0 0.058824 2.9 0.076149 2.6 0.054584 3.0
110.0 0.051071 2.8 0.066989 2.5 0.04717 2.9
115.0 0.044489 2.7 0.059112 2.5 0.040901 2.8
120.0 0.03888 2.7 0.052316 2.4 0.035581 2.8
125.0 0.034084 2.6 0.046433 2.4 0.03105 2.7
130.0 0.02997 2.5 0.041327 2.3 0.027179 2.6
135.0 0.02643 2.5 0.03688 2.3 0.023861 2.6
140.0 0.023373 2.4 0.032998 2.2 0.021008 2.5
145.0 0.020727 2.4 0.029598 2.2 0.018548 2.5
150.0 0.018429 2.3 0.026612 2.1 0.016419 2.4
155.0 0.016427 2.3 0.023984 2.1 0.014573 2.4
α (%/K)
Important notes at the end of this document.
Page 5 of 18Please read Cautions and warnings and
Page 6
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T No.
T (°C) B
7002 7003 8304
= 3988 K B
25/100
RT/R
25
α (%/K) RT/R
= 3625 K B
25/100
25
25/100
α (%/K) RT/R
= 4092 K
25
160.0 0.014679 2.2 0.021665 2.0 0.012967 2.3
165.0 0.013149 2.2 0.019613 2.0 0.011566 2.3
170.0 0.011806 2.1 0.017793 1.9 0.010341 2.2
175.0 0.010623 2.1 0.016176 1.9 0.0092664 2.2
180.0 0.0095804 2.0 0.014735 1.8 0.0083224 2.1
185.0 0.0086582 2.0 0.013448 1.8 0.0074907 2.1
190.0 0.0078408 2.0 0.012297 1.8 0.0067564 2.0
195.0 0.0071148 1.9 0.011265 1.7 0.0061064 2.0
200.0 0.0064685 1.9 0.010338 1.7 0.0055299 2.0
205.0 0.005892 1.8 0.009504 1.7 0.0050175 1.9
210.0 0.0053767 1.8 0.0087516 1.6 0.0045611 1.9
215.0 0.0049152 1.8 0.0080718 1.6 0.0041537 1.9
220.0 0.0045011 1.7 0.0074567 1.6 0.0037895 1.8
225.0 0.0041287 1.7 0.0068989 1.5 0.0034631 1.8
230.0 0.0037934 1.7 0.0063925 1.5 0.0031701 1.8
235.0 0.0034908 1.6 0.0059318 1.5 0.0029067 1.7
240.0 0.0032173 1.6 0.005512 1.5 0.0026693 1.7
245.0 0.0029697 1.6 0.005129 1.4 0.0024551 1.7
250.0 0.0027451 1.6 0.004779 1.4 0.0022615 1.6
255.0 0.0025412 1.5 0.0044586 1.4 0.0020862 1.6
260.0 0.0023556 1.5 0.004165 1.4 0.0019273 1.6
265.0 0.0021865 1.5 0.0038955 1.3 0.0017829 1.5
270.0 0.0020323 1.5 0.0036478 1.3 0.0016516 1.5
275.0 0.0018913 1.4 0.0034199 1.3 0.0015319 1.5
280.0 0.0017623 1.4 0.0032098 1.3 0.0014228 1.5
285.0 0.0016441 1.4 0.003016 1.2 0.0013231 1.4
290.0 0.0015357 1.4 0.002837 1.2 0.0012319 1.4
295.0 0.001436 1.3 0.0026714 1.2 0.0011483 1.4
300.0 0.0013444 1.3 0.002518 1.2 0.0010716 1.4
α (%/K)
Important notes at the end of this document.
Page 6 of 18Please read Cautions and warnings and
Page 7
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T characteristics
R/T No.
T (°C) B
8307 8402 8403
= 3492 K B
25/100
RT/R
25
α (%/K) RT/R
= 3450 K B
0/100
25
0/100
α (%/K) RT/R
= 3970 K
25
55.0 52.624 6.4 51.991 6.4 103.29 7.6
50.0 38.452 6.2 37.989 6.2 71.079 7.3
45.0 28.401 6.0 28.07 5.9 49.619 7.1
40.0 21.194 5.8 20.96 5.7 35.108 6.8
35.0 15.972 5.6 15.809 5.5 25.158 6.5
30.0 12.149 5.4 12.037 5.4 18.245 6.3
25.0 9.3246 5.2 9.2484 5.2 13.383 6.1
20.0 7.2181 5.0 7.1668 5.0 9.9221 5.9
15.0 5.6332 4.9 5.5993 4.9 7.4316 5.7
10.0 4.4308 4.7 4.4087 4.7 5.6202 5.5
5.0 3.5112 4.6 3.4971 4.6 4.2894 5.3
0.0 2.8024 4.4 2.7936 4.4 3.3024 5.2
5.0 2.252 4.3 2.2468 4.3 2.5607 5.0
10.0 1.8216 4.2 1.8187 4.2 2.0017 4.8
15.0 1.4827 4.1 1.4813 4.0 1.5768 4.7
20.0 1.2142 3.9 1.2136 3.9 1.2513 4.6
25.0 1.0000 3.8 1.0000 3.8 1.0000 4.4
30.0 0.82818 3.7 0.82845 3.7 0.80451 4.3
35.0 0.68954 3.6 0.68991 3.6 0.65139 4.2
40.0 0.57703 3.5 0.57742 3.5 0.53064 4.0
45.0 0.48525 3.4 0.4856 3.4 0.43481 3.9
50.0 0.41 3.3 0.41026 3.3 0.35828 3.8
55.0 0.34798 3.2 0.34816 3.2 0.29681 3.7
60.0 0.29663 3.2 0.29673 3.2 0.24715 3.6
65.0 0.25392 3.1 0.25393 3.1 0.20682 3.5
70.0 0.21824 3.0 0.21817 3.0 0.17389 3.4
75.0 0.1883 2.9 0.18816 2.9 0.14687 3.3
80.0 0.16307 2.8 0.16288 2.8 0.12459 3.2
85.0 0.14174 2.8 0.1415 2.8 0.10614 3.2
90.0 0.12362 2.7 0.12335 2.7 0.09078 3.1
95.0 0.10818 2.6 0.10788 2.6 0.077949 3.0
100.0 0.094973 2.6 0.094659 2.6 0.067183 2.9
105.0 0.08364 2.5 0.083313 2.5 0.058113 2.9
110.0 0.073881 2.5 0.073547 2.5 0.050443 2.8
115.0 0.06545 2.4 0.065114 2.4 0.043932 2.7
120.0 0.058144 2.3 0.05781 2.4 0.038386 2.7
125.0 0.051794 2.3 0.051464 2.3 0.033645 2.6
130.0 0.046259 2.2 0.045936 2.2 0.029579 2.5
135.0 0.04142 2.2 0.041106 2.2 0.02608 2.5
140.0 0.037179 2.1 0.036875 2.1 0.02306 2.4
145.0 0.033451 2.1 0.033159 2.1 0.020446 2.4
150.0 0.030166 2.0 0.029886 2.1 0.018176 2.3
155.0 0.027264 2.0 0.026998 2.0 0.016199 2.3
α (%/K)
Important notes at the end of this document.
Page 7 of 18Please read Cautions and warnings and
Page 8
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T No.
T (°C) B
8307 8402 8403
= 3492 K B
25/100
RT/R
25
α (%/K) RT/R
= 3450 K B
0/100
25
0/100
α (%/K) RT/R
= 3970 K
25
160.0 0.024694 2.0 0.024442 2.0 0.014473 2.2
165.0 0.022414 1.9 0.022175 1.9 0.012962 2.2
170.0 0.020385 1.9 0.02016 1.9 0.011636 2.1
175.0 0.018577 1.8 0.018365 1.8 0.010469 2.1
180.0 0.016961 1.8 0.016762 1.8 0.0094395 2.0
185.0 0.015514 1.8 0.015328 1.8 0.0085294 2.0
190.0 0.014216 1.7 0.014043 1.7 0.0077229 2.0
195.0 0.013049 1.7 0.012888 1.7 0.0070067 1.9
200.0 0.011999 1.7 0.011849 1.7 0.0063691 1.9
205.0 0.011051 1.6 0.010913 1.6 0.0058005 1.9
210.0 0.010194 1.6 0.010067 1.6 0.0052924 1.8
215.0 0.0094181 1.6 0.0093013 1.6 0.0048373 1.8
220.0 0.0087144 1.5 0.0086075 1.5 0.004429 1.7
225.0 0.0080751 1.5 0.0079777 1.5 0.004062 1.7
230.0 0.0074933 1.5 0.007405 1.5 0.0037315 1.7
235.0 0.0069631 1.5 0.0068833 1.4 0.0034333 1.6
240.0 0.0064791 1.4 0.0064075 1.4 0.0031639 1.6
245.0 0.0060366 1.4 0.0059728 1.4 0.00292 1.6
250.0 0.0056316 1.4 0.0055751 1.4 0.0026988 1.6
255.0 0.0052602 1.4 0.0052107 1.3 0.002498 1.5
260.0 0.0049193 1.3 0.0048764 1.3 0.0023153 1.5
265.0 0.0046059 1.3 0.0045692 1.3 0.0021489 1.5
270.0 0.0043173 1.3 0.0042866 1.3 0.0019971 1.5
275.0 0.0040514 1.3 0.0040263 1.2 0.0018584 1.4
280.0 0.003806 1.2 0.0037862 1.2 0.0017316 1.4
285.0 0.0035793 1.2 0.0035645 1.2 0.0016153 1.4
290.0 0.0033696 1.2 0.0033595 1.2 0.0015087 1.4
295.0 0.0031753 1.2 0.0031697 1.2 0.0014107 1.3
300.0 0.0029952 1.2 0.0029938 1.1 0.0013207 1.3
α (%/K)
Important notes at the end of this document.
Page 8 of 18Please read Cautions and warnings and
Page 9
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T characteristics
R/T No.
T (°C) B
8405 8406 8415
= 4537 K B
100/200
RT/R
25
α (%/K) RT/R
= 5133 K B
200/300
25
0/100
α (%/K) RT/R
= 3970 K
25
55.0 122.12 7.8 183.3 8.5 103.29 7.6
50.0 83.306 7.5 120.69 8.2 71.079 7.3
45.0 57.62 7.2 80.721 7.9 49.619 7.1
40.0 40.378 7.0 54.792 7.6 35.108 6.8
35.0 28.647 6.7 37.713 7.3 25.158 6.5
30.0 20.563 6.5 26.301 7.1 18.245 6.3
25.0 14.925 6.3 18.571 6.8 13.383 6.1
20.0 10.947 6.1 13.269 6.6 9.9221 5.9
15.0 8.1101 5.9 9.5865 6.4 7.4316 5.7
10.0 6.0655 5.7 6.9997 6.2 5.6202 5.5
5.0 4.5776 5.5 5.1625 6.0 4.2894 5.3
0.0 3.4845 5.4 3.844 5.8 3.3024 5.2
5.0 2.6743 5.2 2.8884 5.6 2.5607 5.0
10.0 2.0686 5.1 2.1892 5.5 2.0017 4.8
15.0 1.6121 4.9 1.673 5.3 1.5768 4.7
20.0 1.2654 4.8 1.2886 5.1 1.2513 4.6
25.0 1.0000 4.6 1.0000 5.0 1.0000 4.4
30.0 0.79548 4.5 0.78164 4.9 0.80451 4.3
35.0 0.63677 4.4 0.61516 4.7 0.65139 4.2
40.0 0.51279 4.3 0.48734 4.6 0.53064 4.0
45.0 0.41534 4.2 0.38851 4.5 0.43481 3.9
50.0 0.33828 4.1 0.3116 4.4 0.35828 3.8
55.0 0.27698 3.9 0.25136 4.2 0.29681 3.7
60.0 0.22795 3.8 0.2039 4.1 0.24715 3.6
65.0 0.18853 3.7 0.16629 4.0 0.20682 3.5
70.0 0.15666 3.7 0.1363 3.9 0.17389 3.4
75.0 0.13077 3.6 0.11228 3.8 0.14687 3.3
80.0 0.10964 3.5 0.092932 3.7 0.12459 3.2
85.0 0.092319 3.4 0.077268 3.6 0.10614 3.2
90.0 0.078049 3.3 0.064527 3.6 0.09078 3.1
95.0 0.066244 3.2 0.054116 3.5 0.077949 3.0
100.0 0.056439 3.2 0.045571 3.4 0.067183 2.9
105.0 0.048262 3.1 0.038526 3.3 0.058113 2.9
110.0 0.041416 3.0 0.032694 3.2 0.050443 2.8
115.0 0.035663 3.0 0.027847 3.2 0.043932 2.7
120.0 0.030811 2.9 0.023803 3.1 0.038386 2.7
125.0 0.026705 2.8 0.020416 3.0 0.033645 2.6
130.0 0.023218 2.8 0.017569 3.0 0.029579 2.5
135.0 0.020247 2.7 0.015167 2.9 0.02608 2.5
140.0 0.017707 2.7 0.013135 2.8 0.02306 2.4
145.0 0.01553 2.6 0.011409 2.8 0.020446 2.4
150.0 0.013658 2.5 0.0099385 2.7 0.018176 2.3
155.0 0.012043 2.5 0.0086821 2.7 0.016199 2.3
α (%/K)
Important notes at the end of this document.
Page 9 of 18Please read Cautions and warnings and
Page 10
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
R/T No.
T (°C) B
8405 8406 8415
= 4537 K B
100/200
RT/R
25
α (%/K) RT/R
= 5133 K B
200/300
25
0/100
α (%/K) RT/R
= 3970 K
25
160.0 0.010647 2.4 0.0076052 2.6 0.014473 2.2
165.0 0.009436 2.4 0.0066796 2.6 0.012962 2.2
170.0 0.0083831 2.3 0.0058817 2.5 0.011636 2.1
175.0 0.0074652 2.3 0.005192 2.5 0.010469 2.1
180.0 0.006663 2.3 0.0045943 2.4 0.0094395 2.0
185.0 0.0059602 2.2 0.0040749 2.4 0.0085294 2.0
190.0 0.0053431 2.2 0.0036225 2.3 0.0077229 2.0
195.0 0.0047999 2.1 0.0032274 2.3 0.0070067 1.9
200.0 0.0043208 2.1 0.0028817 2.2 0.0063691 1.9
205.0 0.0038972 2.0 0.0025783 2.2 0.0058005 1.9
210.0 0.0035219 2.0 0.0023116 2.2 0.0052924 1.8
215.0 0.0031888 2.0 0.0020766 2.1 0.0048373 1.8
220.0 0.0028925 1.9 0.0018691 2.1 0.004429 1.7
225.0 0.0026284 1.9 0.0016854 2.0 0.004062 1.7
230.0 0.0023925 1.9 0.0015226 2.0 0.0037315 1.7
235.0 0.0021816 1.8 0.001378 2.0 0.0034333 1.6
240.0 0.0019925 1.8 0.0012492 1.9 0.0031639 1.6
245.0 0.0018227 1.8 0.0011344 1.9 0.00292 1.6
250.0 0.00167 1.7 0.0010318 1.9 0.0026988 1.6
255.0 0.0015324 1.7 0.00094005 1.8 0.002498 1.5
260.0 0.0014083 1.7 0.00085777 1.8 0.0023153 1.5
265.0 0.0012961 1.6 0.00078388 1.8 0.0021489 1.5
270.0 0.0011946 1.6 0.00071742 1.8 0.0019971 1.5
275.0 0.0011025 1.6 0.00065754 1.7 0.0018584 1.4
280.0 0.0010189 1.6 0.00060352 1.7 0.0017316 1.4
285.0 0.00094294 1.5 0.0005547 1.7 0.0016153 1.4
290.0 0.00087373 1.5 0.00051051 1.6 0.0015087 1.4
295.0 0.00081063 1.5 0.00047047 1.6 0.0014107 1.3
300.0 0.00075301 1.5 0.00043412 1.6 0.0013207 1.3
α (%/K)
Important notes at the end of this document.
Page 10 of 18Please read Cautions and warnings and
Page 11
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 mm = 1.0 N
0.25 < ∅ ≤0.35 mm = 2.5 N
0.35 < ∅ ≤0.50 mm = 5.0 N
0.50 < ∅ ≤0.80 mm = 10.0 N
0.80 < ∅ ≤1.25 mm = 20.0 N
Important notes at the end of this document.
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Page 12
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.
Important notes at the end of this document.
Page 12 of 18Please read Cautions and warnings and
Page 13
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
<95%, maximum 30 days per annum
Solder the thermistors listed in this data book after shipment from EPCOS within the time specified:
SMDs: 12 months
Leaded components: 24 months
Important notes at the end of this document.
Page 13 of 18Please read Cautions and warnings and
Page 14
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Cautions and warnings General
See "Important notes" at the end of this document.
Storage
Store thermistors only in original packaging. Do not open the package prior to storage.
Storage conditions in original packaging: storage temperature 25 °C ... +45 °C, relative
humidity ≤75% annual mean, <95% maximum 30 days per annum, dew precipitation is
inadmissible.
Do not store thermistors where they are exposed to heat or direct sunlight. Otherwise, the
packing material may be deformed or components may stick together, causing problems during
mounting.
Avoid contamination of thermistor surface during storage, handling and processing.
Avoid storage of thermistors in harmful environments like corrosive gases (SOx, Cl etc).
Use the components as soon as possible after opening the factory seals, i.e. the
polyvinyl-sealed packages.
Solder thermistors within the time specified after shipment from EPCOS.
For leaded components this is 24 months, for SMDs 12 months.
Handling
NTC thermistors must not be dropped. Chip-offs or any other damage must not be caused
during handling of NTCs.
Do not touch components with bare hands. Gloves are recommended.
Avoid contamination of thermistor surface during handling.
Bending / twisting leads
A lead (wire) may be bent at a minimum distance of twice the wire’s diameter plus 4 mm from
the component head or housing. When bending ensure the wire is mechanically relieved at the
component head or housing. The bending radius should be at least 0.75 mm.
Twisting (torsion) by 180° of a lead bent by 90° is permissible at 6 mm from the bottom of the
thermistor body.
Soldering
Use resin-type flux or non-activated flux.
Insufficient preheating may cause ceramic cracks.
Rapid cooling by dipping in solvent is not recommended.
Complete removal of flux is recommended.
Important notes at the end of this document.
Page 14 of 18Please read Cautions and warnings and
Page 15
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Mounting
Ensure that no thermo-mechanical stress occurs due to production processes (curing or
overmolding processes) when thermistors are sealed, potted or overmolded or during their
subsequent operation. The maximum temperature of the thermistor must not be exceeded.
Ensure that the materials used (sealing/potting compound and plastic material) are chemically
neutral.
Electrodes/contacts must not be scratched or damaged before/during/after the mounting
process.
Contacts and housing used for assembly with the thermistor must be clean before mounting.
Ensure that adjacent materials are designed for operation at temperatures comparable to the
surface temperature of the thermistor. Be sure that surrounding parts and materials can
withstand the temperature.
Avoid contamination of the thermistor surface during processing.
The connections of sensors (e.g. cable end, wire end, plug terminal) may only be exposed to
an environment with normal atmospheric conditions.
Tensile forces on cables or leads must be avoided during mounting and operation.
Bending or twisting of cables or leads directly on the thermistor body is not permissible.
Avoid using chemical substances as mounting aids. It must be ensured that no water or other
liquids enter the NTC thermistors (e.g. through plug terminals). In particular, water based
substances (e.g. soap suds) must not be used as mounting aids for sensors.
Operation
Use thermistors only within the specified operating temperature range.
Use thermistors only within the specified power range.
Environmental conditions must not harm the thermistors. Only use the thermistors under
normal atmospheric conditions or within the specified conditions.
Contact of NTC thermistors with any liquids and solvents should be prevented. It must be
ensured that no water enters the NTC thermistors (e.g. through plug terminals). For
measurement purposes (checking the specified resistance vs. temperature), the component
must not be immersed in water but in suitable liquids (e.g. Galden).
Avoid dewing and condensation unless thermistor is specified for these conditions.
Bending or twisting of cables and/or wires is not permissible during operation of the sensor in
the application.
Be sure to provide an appropriate fail-safe function to prevent secondary product damage
caused by malfunction.
This listing does not claim to be complete, but merely reflects the experience of EPCOS AG.
Important notes at the end of this document.
Page 15 of 18Please read Cautions and warnings and
Page 16
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Symbols and terms
Symbol English German
A Area Fläche
AWG American Wire Gauge Amerikanische Norm für Drahtquerschnitte
B B value B-Wert
B
C
25/100
th
B value determined by resistance
measurement at 25 °C and 100 °C
B-Wert, ermittelt durch Widerstandsmessungen bei 25 °C und 100 °C
Heat capacitance Wärmekapazität
I Current Strom
N Number (integer) Anzahl (ganzzahliger Wert)
P
25
P
diss
P
el
P
max
∆RB/R
R
ins
R
P
R
R
∆RR/R
R
S
R
T
Maximum power at 25 °C Maximale Leistung bei 25 °C
Power dissipation Verlustleistung
Electrical power Elektrische Leistung
Maximum power within stated
temperature range
Resistance tolerance caused by
B
spread of B value
Maximale Leistung im
angegebenenTemperaturbereich
Widerstandstoleranz, die durch die
Streuung des B-Wertes verursacht wird
Insulation resistance Isolationswiderstand
Parallel resistance Parallelwiderstand
Rated resistance Nennwiderstand
Resistance tolerance Widerstandstoleranz
R
Series resistance Serienwiderstand
Resistance at temperature T
(e.g. R25= resistance at 25 °C)
Widerstand bei Temperatur T
(z.B. R25= Widerstand bei 25 °C)
T Temperature Temperatur
∆T Temperature tolerance Temperaturtoleranz
t Time Zeit
T
A
T
max
Ambient temperature Umgebungstemperatur
Upper category temperature Obere Grenztemperatur
(Kategorietemperatur)
T
min
Lower category temperature Untere Grenztemperatur
(Kategorietemperatur)
T
op
T
R
T
surf
Operating temperature Betriebstemperatur
Rated temperature Nenntemperatur
Surface temperature Oberflächentemperatur
V Voltage Spannung
V
ins
V
op
V
test
Insulation test voltage Isolationsprüfspannung
Operating voltage Betriebsspannung
Test voltage Prüfspannung
Important notes at the end of this document.
Page 16 of 18Please read Cautions and warnings and
Page 17
Temperature measurement B57540G, B57540G1
Glass-encapsulated sensors G540/G1540
Symbol English German
α Temperature coefficient Temperaturkoeffizient
∆ Tolerance, change Toleranz, Änderung
δ
th
τ
c
τ
a
Dissipation factor Wärmeleitwert
Thermal cooling time constant Thermische Abkühlzeitkonstante
Thermal time constant Thermische Zeitkonstante
Abbreviations / Notes
Symbol English German
Surface-mounted devices Oberflächenmontierbares Bauelement
* To be replaced by a number in ordering
codes, type designations etc.
Platzhalter für Zahl im Bestellnummern-
code oder für die Typenbezeichnung.
+ To be replaced by a letter. Platzhalter für einen Buchstaben.
All dimensions are given in mm. Alle Maße sind in mm angegeben.
The commas used in numerical values
denote decimal points.
Verwendete Kommas in Zahlenwerten
bezeichnen Dezimalpunkte.
Important notes at the end of this document.
Page 17 of 18Please read Cautions and warnings and
Page 18
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application.
As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar
with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether an EPCOS product with the properties described in the product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or
failure before the end of their usual service life cannot be completely ruled out in the
current state of the art, even if they are operated as specified. In customer applications
requiring a very high level of operational safety and especially in customer applications in
which the malfunction or failure of an electronic component could endanger human life or
health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by
means of suitable design of the customer application or other action taken by the customer
(e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by
third parties in the event of malfunction or failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our Ma-
terial Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order. We also
reserve the right to discontinue production and delivery of products. Consequently, we
cannot guarantee that all products named in this publication will always be available. The
aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current ver-
sion of the "General Terms of Delivery for Products and Services in the Electrical Industry" published by the German Electrical and Electronics Industry Association
(ZVEI).
7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CSMP, CSSP, CTVS, DSSP,
MiniBlue, MKK, MLSC, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, SIFERRIT,
SIFI, SIKOREL, SilverCap, SIMDAD, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse,
WindCap are trademarks registered or pending in Europe and in other countries. Further
information will be found on the Internet at www.epcos.com/trademarks.
Page 18 of 18
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