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NTC thermistors for temperature measurement
Glass-encapsulated sensors, standard type
Series/Type: Date:
B57540G, B57540G1 February 2009
(c) 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 Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Applications 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 Bulk 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)
Dimensional drawing
Dimensions in mm
(in air) (in air)
P25 RR/RR TR th c Cth
55/250/56 18 1, 2, 3 25 approx. 0.4 approx. 3 approx. 1.3
mW % C mW/K s mJ/K
Please read Cautions and warnings and Important notes at the end of this document.
Page 2 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Electrical specification and ordering codes R25 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) 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
+ = 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
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Reliability data Test Storage in dry heat Standard IEC 60068-2-2 Test conditions R25/R25 (typical) < 3% Remarks No visible damage
Storage in damp heat, steady state Rapid temperature cycling
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
< 2%
No visible damage No visible damage
< 2%
Please read Cautions and warnings and Important notes at the end of this document.
Page 4 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
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
7002
7003
8304
B25/100 = 3988 K B25/100 = 3625 K B25/100 = 4092 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/K) 96.33 66.866 47.037 33.508 24.156 17.613 12.98 9.6643 7.2656 5.5129 4.22 3.2575 2.5348 1.9876 1.5699 1.2488 1.0000 0.80594 0.65355 0.53312 0.43735 0.36074 0.29911 0.24925 0.20872 0.17558 0.14837 0.12592 0.10731 0.091816 0.078862 0.067988 0.058824 0.051071 0.044489 0.03888 0.034084 0.02997 0.02643 0.023373 0.020727 0.018429 0.016427 7.4 7.2 6.9 6.7 6.4 6.2 6.0 5.8 5.6 5.4 5.3 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 3.2 3.2 3.1 3.0 2.9 2.9 2.8 2.7 2.7 2.6 2.5 2.5 2.4 2.4 2.3 2.3 63.225 45.46 33.07 24.324 18.081 13.575 10.29 7.8716 6.0739 4.7258 3.7062 2.9287 2.3311 1.8684 1.5075 1.224 1.0000 0.82176 0.67909 0.56422 0.47122 0.3955 0.33355 0.2826 0.24049 0.20553 0.17637 0.15195 0.13141 0.11406 0.099352 0.086837 0.076149 0.066989 0.059112 0.052316 0.046433 0.041327 0.03688 0.032998 0.029598 0.026612 0.023984 6.7 6.5 6.3 6.0 5.8 5.6 5.4 5.3 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 3.1 3.0 2.9 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 2.1 100.11 69.56 48.945 34.853 25.102 18.275 13.443 9.9853 7.4867 5.6636 4.3212 3.324 2.5769 2.0127 1.5834 1.2542 1.0000 0.80239 0.64776 0.52598 0.4295 0.35262 0.291 0.24136 0.20114 0.16841 0.14164 0.11963 0.10147 0.086407 0.073867 0.063383 0.054584 0.04717 0.040901 0.035581 0.03105 0.027179 0.023861 0.021008 0.018548 0.016419 0.014573 7.4 7.2 6.9 6.7 6.5 6.2 6.0 5.9 5.7 5.5 5.3 5.2 5.0 4.9 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 2.4 2.4
Please read Cautions and warnings and Important notes at the end of this document.
Page 5 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
R/T No. T (C) 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0
7002
7003
8304
B25/100 = 3988 K B25/100 = 3625 K B25/100 = 4092 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/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 0.011806 0.010623 0.0095804 0.0086582 0.0078408 0.0071148 0.0064685 0.005892 0.0053767 0.0049152 0.0045011 0.0041287 0.0037934 0.0034908 0.0032173 0.0029697 0.0027451 0.0025412 0.0023556 0.0021865 0.0020323 0.0018913 0.0017623 0.0016441 0.0015357 0.001436 0.0013444 2.1 2.1 2.0 2.0 2.0 1.9 1.9 1.8 1.8 1.8 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.5 1.4 1.4 1.4 1.4 1.3 1.3 0.017793 0.016176 0.014735 0.013448 0.012297 0.011265 0.010338 0.009504 0.0087516 0.0080718 0.0074567 0.0068989 0.0063925 0.0059318 0.005512 0.005129 0.004779 0.0044586 0.004165 0.0038955 0.0036478 0.0034199 0.0032098 0.003016 0.002837 0.0026714 0.002518 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 1.4 1.4 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 0.010341 0.0092664 0.0083224 0.0074907 0.0067564 0.0061064 0.0055299 0.0050175 0.0045611 0.0041537 0.0037895 0.0034631 0.0031701 0.0029067 0.0026693 0.0024551 0.0022615 0.0020862 0.0019273 0.0017829 0.0016516 0.0015319 0.0014228 0.0013231 0.0012319 0.0011483 0.0010716 2.2 2.2 2.1 2.1 2.0 2.0 2.0 1.9 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 1.4 1.4
Please read Cautions and warnings and Important notes at the end of this document.
Page 6 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
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
8307
8402
8403
B25/100 = 3492 K B0/100 = 3450 K B0/100 = 3970 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/K) 52.624 38.452 28.401 21.194 15.972 12.149 9.3246 7.2181 5.6332 4.4308 3.5112 2.8024 2.252 1.8216 1.4827 1.2142 1.0000 0.82818 0.68954 0.57703 0.48525 0.41 0.34798 0.29663 0.25392 0.21824 0.1883 0.16307 0.14174 0.12362 0.10818 0.094973 0.08364 0.073881 0.06545 0.058144 0.051794 0.046259 0.04142 0.037179 0.033451 0.030166 0.027264 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 4.9 4.7 4.6 4.4 4.3 4.2 4.1 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.2 3.1 3.0 2.9 2.8 2.8 2.7 2.6 2.6 2.5 2.5 2.4 2.3 2.3 2.2 2.2 2.1 2.1 2.0 2.0 51.991 37.989 28.07 20.96 15.809 12.037 9.2484 7.1668 5.5993 4.4087 3.4971 2.7936 2.2468 1.8187 1.4813 1.2136 1.0000 0.82845 0.68991 0.57742 0.4856 0.41026 0.34816 0.29673 0.25393 0.21817 0.18816 0.16288 0.1415 0.12335 0.10788 0.094659 0.083313 0.073547 0.065114 0.05781 0.051464 0.045936 0.041106 0.036875 0.033159 0.029886 0.026998 6.4 6.2 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 3.2 3.1 3.0 2.9 2.8 2.8 2.7 2.6 2.6 2.5 2.5 2.4 2.4 2.3 2.2 2.2 2.1 2.1 2.1 2.0 103.29 71.079 49.619 35.108 25.158 18.245 13.383 9.9221 7.4316 5.6202 4.2894 3.3024 2.5607 2.0017 1.5768 1.2513 1.0000 0.80451 0.65139 0.53064 0.43481 0.35828 0.29681 0.24715 0.20682 0.17389 0.14687 0.12459 0.10614 0.09078 0.077949 0.067183 0.058113 0.050443 0.043932 0.038386 0.033645 0.029579 0.02608 0.02306 0.020446 0.018176 0.016199 7.6 7.3 7.1 6.8 6.5 6.3 6.1 5.9 5.7 5.5 5.3 5.2 5.0 4.8 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 3.2 3.1 3.0 2.9 2.9 2.8 2.7 2.7 2.6 2.5 2.5 2.4 2.4 2.3 2.3
Please read Cautions and warnings and Important notes at the end of this document.
Page 7 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
R/T No. T (C) 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0
8307
8402
8403
B25/100 = 3492 K B0/100 = 3450 K B0/100 = 3970 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/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 0.020385 0.018577 0.016961 0.015514 0.014216 0.013049 0.011999 0.011051 0.010194 0.0094181 0.0087144 0.0080751 0.0074933 0.0069631 0.0064791 0.0060366 0.0056316 0.0052602 0.0049193 0.0046059 0.0043173 0.0040514 0.003806 0.0035793 0.0033696 0.0031753 0.0029952 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 1.4 1.4 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 0.02016 0.018365 0.016762 0.015328 0.014043 0.012888 0.011849 0.010913 0.010067 0.0093013 0.0086075 0.0079777 0.007405 0.0068833 0.0064075 0.0059728 0.0055751 0.0052107 0.0048764 0.0045692 0.0042866 0.0040263 0.0037862 0.0035645 0.0033595 0.0031697 0.0029938 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 1.4 1.4 1.4 1.4 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.1 0.011636 0.010469 0.0094395 0.0085294 0.0077229 0.0070067 0.0063691 0.0058005 0.0052924 0.0048373 0.004429 0.004062 0.0037315 0.0034333 0.0031639 0.00292 0.0026988 0.002498 0.0023153 0.0021489 0.0019971 0.0018584 0.0017316 0.0016153 0.0015087 0.0014107 0.0013207 2.1 2.1 2.0 2.0 2.0 1.9 1.9 1.9 1.8 1.8 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.5 1.4 1.4 1.4 1.4 1.3 1.3
Please read Cautions and warnings and Important notes at the end of this document.
Page 8 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
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
8405
8406
8415
B100/200 = 4537 K B200/300 = 5133 K B0/100 = 3970 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/K) 122.12 83.306 57.62 40.378 28.647 20.563 14.925 10.947 8.1101 6.0655 4.5776 3.4845 2.6743 2.0686 1.6121 1.2654 1.0000 0.79548 0.63677 0.51279 0.41534 0.33828 0.27698 0.22795 0.18853 0.15666 0.13077 0.10964 0.092319 0.078049 0.066244 0.056439 0.048262 0.041416 0.035663 0.030811 0.026705 0.023218 0.020247 0.017707 0.01553 0.013658 0.012043 7.8 7.5 7.2 7.0 6.7 6.5 6.3 6.1 5.9 5.7 5.5 5.4 5.2 5.1 4.9 4.8 4.6 4.5 4.4 4.3 4.2 4.1 3.9 3.8 3.7 3.7 3.6 3.5 3.4 3.3 3.2 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.7 2.6 2.5 2.5 183.3 120.69 80.721 54.792 37.713 26.301 18.571 13.269 9.5865 6.9997 5.1625 3.844 2.8884 2.1892 1.673 1.2886 1.0000 0.78164 0.61516 0.48734 0.38851 0.3116 0.25136 0.2039 0.16629 0.1363 0.11228 0.092932 0.077268 0.064527 0.054116 0.045571 0.038526 0.032694 0.027847 0.023803 0.020416 0.017569 0.015167 0.013135 0.011409 0.0099385 0.0086821 8.5 8.2 7.9 7.6 7.3 7.1 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.5 5.3 5.1 5.0 4.9 4.7 4.6 4.5 4.4 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.6 3.5 3.4 3.3 3.2 3.2 3.1 3.0 3.0 2.9 2.8 2.8 2.7 2.7 103.29 71.079 49.619 35.108 25.158 18.245 13.383 9.9221 7.4316 5.6202 4.2894 3.3024 2.5607 2.0017 1.5768 1.2513 1.0000 0.80451 0.65139 0.53064 0.43481 0.35828 0.29681 0.24715 0.20682 0.17389 0.14687 0.12459 0.10614 0.09078 0.077949 0.067183 0.058113 0.050443 0.043932 0.038386 0.033645 0.029579 0.02608 0.02306 0.020446 0.018176 0.016199 7.6 7.3 7.1 6.8 6.5 6.3 6.1 5.9 5.7 5.5 5.3 5.2 5.0 4.8 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 3.2 3.1 3.0 2.9 2.9 2.8 2.7 2.7 2.6 2.5 2.5 2.4 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 Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
R/T No. T (C) 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0
8405
8406
8415
B100/200 = 4537 K B200/300 = 5133 K B0/100 = 3970 K RT/R25 (%/K) RT/R25 (%/K) RT/R25 (%/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 0.0083831 0.0074652 0.006663 0.0059602 0.0053431 0.0047999 0.0043208 0.0038972 0.0035219 0.0031888 0.0028925 0.0026284 0.0023925 0.0021816 0.0019925 0.0018227 0.00167 0.0015324 0.0014083 0.0012961 0.0011946 0.0011025 0.0010189 0.00094294 0.00087373 2.3 2.3 2.3 2.2 2.2 2.1 2.1 2.0 2.0 2.0 1.9 1.9 1.9 1.8 1.8 1.8 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.5 1.5 0.0058817 0.005192 0.0045943 0.0040749 0.0036225 0.0032274 0.0028817 0.0025783 0.0023116 0.0020766 0.0018691 0.0016854 0.0015226 0.001378 0.0012492 0.0011344 0.0010318 0.00094005 0.00085777 0.00078388 0.00071742 0.00065754 0.00060352 0.0005547 0.00051051 2.5 2.5 2.4 2.4 2.3 2.3 2.2 2.2 2.2 2.1 2.1 2.0 2.0 2.0 1.9 1.9 1.9 1.8 1.8 1.8 1.8 1.7 1.7 1.7 1.6 0.011636 0.010469 0.0094395 0.0085294 0.0077229 0.0070067 0.0063691 0.0058005 0.0052924 0.0048373 0.004429 0.004062 0.0037315 0.0034333 0.0031639 0.00292 0.0026988 0.002498 0.0023153 0.0021489 0.0019971 0.0018584 0.0017316 0.0016153 0.0015087 0.0014107 0.0013207 2.1 2.1 2.0 2.0 2.0 1.9 1.9 1.9 1.8 1.8 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.5 1.4 1.4 1.4 1.4 1.3 1.3
0.00081063 1.5 0.00075301 1.5
0.00047047 1.6 0.00043412 1.6
Please read Cautions and warnings and Important notes at the end of this document.
Page 10 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Mounting instructions 1 1.1 Soldering 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 Bath temperature Soldering time Distance from thermistor max. 260 C max. 4 s min. 6 mm Iron soldering max. 360 C max. 2 s 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 < 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
Please read Cautions and warnings and Important notes at the end of this document.
Page 11 of 18
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 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 Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
The components should be left in the original packing. Touching the metallization of unsoldered thermistors may change their soldering properties. Storage temperature: Relative humidity (without condensation): 25 C up to 45 C 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: Leaded components: 12 months 24 months
Please read Cautions and warnings and Important notes at the end of this document.
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Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 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.
Please read Cautions and warnings and Important notes at the end of this document.
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Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 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.
Please read Cautions and warnings and Important notes at the end of this document.
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Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Symbols and terms Symbol A AWG B B25/100 Cth I N P25 Pdiss Pel Pmax RB/RB Rins RP RR RR/RR RS RT T T t TA Tmax Tmin Top TR Tsurf V Vins Vop Vtest English Area American Wire Gauge B value B value determined by resistance measurement at 25 C and 100 C Heat capacitance Current Number (integer) Maximum power at 25 C Power dissipation Electrical power Maximum power within stated temperature range Resistance tolerance caused by spread of B value Insulation resistance Parallel resistance Rated resistance Resistance tolerance Series resistance Resistance at temperature T (e.g. R25 = resistance at 25 C) Temperature Temperature tolerance Time Ambient temperature Upper category temperature Lower category temperature Operating temperature Rated temperature Surface temperature Voltage Insulation test voltage Operating voltage Test voltage German Flache Amerikanische Norm fur Drahtquerschnitte B-Wert B-Wert, ermittelt durch Widerstandsmessungen bei 25 C und 100 C Warmekapazitat Strom Anzahl (ganzzahliger Wert) Maximale Leistung bei 25 C Verlustleistung Elektrische Leistung Maximale Leistung im angegebenenTemperaturbereich Widerstandstoleranz, die durch die Streuung des B-Wertes verursacht wird Isolationswiderstand Parallelwiderstand Nennwiderstand Widerstandstoleranz Serienwiderstand Widerstand bei Temperatur T (z.B. R25 = Widerstand bei 25 C) Temperatur Temperaturtoleranz Zeit Umgebungstemperatur Obere Grenztemperatur (Kategorietemperatur) Untere Grenztemperatur (Kategorietemperatur) Betriebstemperatur Nenntemperatur Oberflachentemperatur Spannung Isolationsprufspannung Betriebsspannung Prufspannung
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Please read Cautions and warnings and Important notes at the end of this document.
Temperature measurement Glass-encapsulated sensors
B57540G, B57540G1 G540/G1540
Symbol th c a
English Temperature coefficient Tolerance, change Dissipation factor Thermal cooling time constant Thermal time constant
German Temperaturkoeffizient Toleranz, Anderung Warmeleitwert Thermische Abkuhlzeitkonstante Thermische Zeitkonstante
Abbreviations / Notes Symbol English Surface-mounted devices * + German Oberflachenmontierbares Bauelement
To be replaced by a number in ordering Platzhalter fur Zahl im Bestellnummerncodes, type designations etc. code oder fur die Typenbezeichnung. To be replaced by a letter. All dimensions are given in mm. The commas used in numerical values denote decimal points. Platzhalter fur einen Buchstaben. Alle Mae sind in mm angegeben. Verwendete Kommas in Zahlenwerten bezeichnen Dezimalpunkte.
Please read Cautions and warnings and Important notes at the end of this document.
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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 Material 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 version 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.
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