NTC thermistors for
temperature measurement
Leaded NTC thermistors,
lead spacing 5 mm
Series/Type:
B57164K
Date:
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 and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
Applications
Temperature measurement and
compensation
K164
Dimensional drawing
Features
Wide resistance range
Cost-effective
Lacquer-coated thermistor disk
Tinned copper leads
Lead spacing 5 mm
Marked with resistance and tolerance
Delivery mode
Bulk (standard), cardboard tape, reeled or in
Ammo pack on request
Dimensions in mm
Approx. weight 370 mg
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 31
55/125/21
450
±5, ±10
25
approx. 7.5
approx. 20
approx. 150
mW
%
°C
mW/K
s
mJ/K
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
Electrical specification and ordering codes
R25
Ω
22
33
47
68
100
150
220
330
470
680
1k
1.5 k
2.2 k
3.3 k
4.7 k
6.8 k
10 k
15 k
22 k
33 k
47 k
68 k
100 k
150 k
220 k
330 k
470 k
No. of R/T
characteristic
1203
1203
1302
1303
1305
1305
1305
1306
1306
1307
1011
1013
1013
4001
4001
2903
2904
1014
1012
1012
4003
2005
2005
2005
2007
2006
2006
B25/100
K
2900 ±3%
2900 ±3%
3000 ±3%
3050 ±3%
3200 ±3%
3200 ±3%
3200 ±3%
3450 ±3%
3450 ±3%
3560 ±3%
3730 ±3%
3900 ±3%
3900 ±3%
3950 ±3%
3950 ±3%
4200 ±3%
4300 ±3%
4250 ±3%
4300 ±3%
4300 ±3%
4450 ±3%
4600 ±3%
4600 ±3%
4600 ±3%
4830 ±3%
5000 ±3%
5000 ±3%
+ = Resistance tolerance
J = ±5%
K = ±10%
Please read Cautions and warnings and
Important notes at the end of this document.
Page 3 of 31
Ordering code
B57164K0220+000
B57164K0330+000
B57164K0470+000
B57164K0680+000
B57164K0101+000
B57164K0151+000
B57164K0221+000
B57164K0331+000
B57164K0471+000
B57164K0681+000
B57164K0102+000
B57164K0152+000
B57164K0222+000
B57164K0332+000
B57164K0472+000
B57164K0682+000
B57164K0103+000
B57164K0153+000
B57164K0223+000
B57164K0333+000
B57164K0473+000
B57164K0683+000
B57164K0104+000
B57164K0154+000
B57164K0224+000
B57164K0334+000
B57164K0474+000
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
Reliability data
Test
Standard
Storage in
dry heat
IEC
60068-2-2
Storage in damp
heat, steady state
Rapid temperature
cycling
Endurance
Long-term stability
(empirical value)
Test conditions
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: 21 days
IEC
Lower test temperature: 55 °C
60068-2-14 Upper test temperature: 125 °C
Number of cycles: 10
Pmax: 450 mW
t: 1000 h
Temperature: 70 °C
t: 10000 h
∆R25/R25
(typical)
< 3%
Remarks
< 3%
No visible
damage
< 3%
No visible
damage
< 3%
No visible
damage
No visible
damage
< 5%
No visible
damage
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 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
1011
1012
1013
B25/100 = 3730 K
B25/100 = 4300 K
B25/100 = 3900 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
70.014
49.906
36.015
26.296
19.411
6.9
6.7
6.4
6.2
6.0
87.237
62.264
44.854
32.599
23.893
6.8
6.7
6.5
6.3
6.1
77.285
54.938
39.507
28.722
21.099
7.0
6.7
6.5
6.3
6.1
30.0
25.0
20.0
15.0
10.0
14.479
10.903
8.2923
6.3591
4.9204
5.8
5.6
5.4
5.2
5.1
17.654
13.098
9.8059
7.4266
5.6677
6.0
5.8
5.7
5.5
5.4
15.652
11.715
8.8541
6.7433
5.1815
5.9
5.7
5.6
5.4
5.2
5.0
0.0
5.0
10.0
15.0
3.8279
3.0029
2.3773
1.8959
1.5207
4.9
4.8
4.6
4.5
4.3
4.3213
3.3208
2.5842
2.0238
1.5858
5.3
5.1
5.0
4.9
4.8
4.0099
3.1283
2.4569
1.9438
1.5475
5.1
4.9
4.8
4.6
4.5
20.0
25.0
30.0
35.0
40.0
1.228
1.0000
0.81779
0.67341
0.55747
4.2
4.1
3.9
3.8
3.7
1.2507
1.0000
0.7964
0.64053
0.51772
4.7
4.5
4.4
4.3
4.2
1.2403
1.0000
0.81104
0.66146
0.54254
4.4
4.3
4.1
4.0
3.9
45.0
50.0
55.0
60.0
65.0
0.46357
0.3874
0.32368
0.272
0.23041
3.6
3.6
3.5
3.4
3.3
0.41958
0.34172
0.27877
0.22861
0.18872
4.1
4.1
4.0
3.9
3.8
0.44727
0.37067
0.30865
0.25825
0.21707
3.8
3.7
3.6
3.5
3.4
70.0
75.0
80.0
85.0
90.0
0.19604
0.16735
0.14342
0.12347
0.10668
3.2
3.1
3.0
3.0
2.8
0.15645
0.13012
0.10863
0.091115
0.0767
3.7
3.6
3.6
3.5
3.4
0.18323
0.15535
0.13223
0.11302
0.096951
3.3
3.3
3.2
3.1
3.0
95.0
100.0
105.0
110.0
115.0
0.092734
0.080903
0.070616
0.061826
0.054282
2.8
2.8
2.7
2.6
2.6
0.064867
0.055047
0.046797
0.039904
0.034255
3.3
3.3
3.2
3.1
3.1
0.083487
0.072139
0.062559
0.054425
0.047508
3.0
2.9
2.8
2.8
2.7
120.0
125.0
0.047793
0.042249
2.5
2.4
0.029498
0.025448
3.0
3.0
0.041594
0.036532
2.6
2.6
Please read Cautions and warnings and
Important notes at the end of this document.
Page 5 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
1014
1203
1302
B25/100 = 4250 K
B25/100 = 2900 K
B25/100 = 3000 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
83.935
60.228
43.593
31.815
23.404
6.8
6.6
6.4
6.3
6.1
30.0
25.0
20.0
15.0
10.0
17.349
12.946
9.7439
7.3737
5.6247
6.0
5.8
5.7
5.5
5.4
8.4216
6.7001
5.3757
4.3443
3.5376
4.7
4.5
4.3
4.2
4.1
8.9067
7.0357
5.6065
4.5044
3.6471
4.8
4.6
4.5
4.3
4.2
5.0
0.0
5.0
10.0
15.0
4.3063
3.3221
2.5779
2.0144
1.5848
5.3
5.2
5.0
4.9
4.8
2.8995
2.3929
1.9866
1.6596
1.3941
3.9
3.8
3.7
3.5
3.4
2.9746
2.4429
2.0194
1.6797
1.4053
4.0
3.9
3.8
3.6
3.5
20.0
25.0
30.0
35.0
40.0
1.2547
1.0000
0.79913
0.64287
0.51991
4.6
4.6
4.4
4.3
4.2
1.1777
1.0000
0.85337
0.7317
0.63032
3.3
3.2
3.1
3.0
2.9
1.1823
1.0000
0.85007
0.72608
0.623
3.4
3.3
3.2
3.1
3.0
45.0
50.0
55.0
60.0
65.0
0.42299
0.34573
0.28298
0.23277
0.19262
4.1
4.1
4.0
3.8
3.8
0.54534
0.47384
0.41336
0.36201
0.31822
2.9
2.8
2.7
2.6
2.5
0.53685
0.46453
0.40357
0.35193
0.30799
2.9
2.9
2.8
2.7
2.6
70.0
75.0
80.0
85.0
90.0
0.16005
0.13349
0.11175
0.093934
0.079231
3.7
3.6
3.5
3.5
3.4
0.28073
0.2485
0.22069
0.19663
0.17572
2.5
2.4
2.3
2.3
2.2
0.27047
0.23832
0.21067
0.18677
0.16607
2.6
2.5
2.4
2.4
2.3
95.0
100.0
105.0
110.0
115.0
0.067054
0.056932
0.048591
0.041605
0.035653
3.3
3.2
3.1
3.1
3.1
0.1575
0.14157
0.1276
0.11531
0.10447
2.2
2.1
2.1
2.0
2.0
0.14805
0.13233
0.11862
0.1066
0.096009
2.3
2.2
2.2
2.1
2.1
120.0
125.0
0.030636
0.026454
3.0
2.9
0.094881
0.086371
1.9
1.9
0.086667
0.078398
2.0
2.0
Please read Cautions and warnings and
Important notes at the end of this document.
30.252
22.966
17.612
13.65
10.671
5.6
5.4
5.2
5.0
4.8
Page 6 of 31
33.701
25.252
19.149
14.684
11.38
5.9
5.7
5.4
5.2
5.0
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
55.0
50.0
45.0
40.0
35.0
1303
1305
1306
B25/100 = 3050 K
B25/100 = 3200 K
B25/100 = 3450 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
34.363
25.827
19.635
15.089
11.712
5.8
5.6
5.4
5.2
5.0
42.131
31.129
23.273
17.592
13.438
6.2
5.9
5.7
5.5
5.3
49.935
36.64
27.18
20.37
15.416
6.3
6.1
5.9
5.7
5.5
30.0
25.0
20.0
15.0
10.0
9.1774
7.2552
5.7835
4.6467
3.7611
4.8
4.6
4.5
4.3
4.2
10.366
8.1005
6.3856
5.0364
4.0067
5.0
4.9
4.8
4.7
4.4
11.775
9.0698
7.0497
5.5187
4.3558
5.3
5.1
5.0
4.8
4.7
5.0
0.0
5.0
10.0
15.0
3.0547
2.4986
2.0575
1.7051
1.421
4.1
4.0
3.8
3.7
3.6
3.2217
2.6097
2.126
1.7438
1.4415
4.3
4.2
4.0
3.9
3.8
3.4609
2.7705
2.2313
1.8098
1.4762
4.5
4.4
4.3
4.1
4.0
20.0
25.0
30.0
35.0
40.0
1.191
1.0000
0.85053
0.72386
0.61897
3.6
3.3
3.3
3.2
3.1
1.1987
1.0000
0.84185
0.7108
0.60317
3.7
3.5
3.4
3.3
3.2
1.2116
1.0000
0.82984
0.6922
0.58042
3.9
3.8
3.7
3.6
3.5
45.0
50.0
55.0
60.0
65.0
0.53134
0.45814
0.39637
0.34439
0.30081
3.0
2.9
2.9
2.7
2.7
0.51419
0.44037
0.37824
0.32636
0.28333
3.1
3.1
3.0
2.9
2.8
0.48899
0.41395
0.35197
0.3006
0.2578
3.4
3.3
3.2
3.1
3.0
70.0
75.0
80.0
85.0
90.0
0.26372
0.23212
0.20501
0.1815
0.16117
2.6
2.5
2.5
2.4
2.4
0.24697
0.21573
0.18908
0.16649
0.14709
2.7
2.7
2.6
2.5
2.5
0.22197
0.19189
0.16648
0.14498
0.12669
3.0
2.9
2.8
2.7
2.7
95.0
100.0
105.0
110.0
115.0
0.1433
0.12775
0.11458
0.10306
0.092752
2.3
2.2
2.1
2.1
2.1
0.13021
0.1156
0.10301
0.092038
0.082442
2.4
2.3
2.3
2.2
2.2
0.11109
0.097717
0.086235
0.076325
0.06776
2.6
2.5
2.5
2.4
2.4
120.0
125.0
0.083677
0.075739
2.0
2.0
0.074035
0.066701
2.1
2.1
0.06032
0.053852
2.3
2.2
Please read Cautions and warnings and
Important notes at the end of this document.
Page 7 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
1307
2005
2006
B25/100 = 3560 K
B25/100 = 4600 K
B25/100 = 5000 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
51.115
38.3
28.847
21.842
16.627
5.7
5.7
5.6
5.5
5.4
30.0
25.0
20.0
15.0
10.0
12.725
9.7859
7.5902
5.8918
4.6124
5.3
5.2
5.1
5.0
4.8
22.746
16.49
12.071
8.8455
6.5446
6.6
6.4
6.3
6.1
6.0
28.272
19.997
14.292
10.35
7.5614
7.1
6.9
6.6
6.4
6.4
5.0
0.0
5.0
10.0
15.0
3.6247
2.8717
2.2929
1.8442
1.4941
4.7
4.6
4.4
4.3
4.2
4.8852
3.6781
2.7944
2.1391
1.6507
5.8
5.6
5.4
5.3
5.1
5.5343
4.086
3.0374
2.276
1.7188
6.2
6.0
5.9
5.7
5.6
20.0
25.0
30.0
35.0
40.0
1.2183
1.0000
0.82246
0.68231
0.56909
4.0
3.9
3.8
3.7
3.6
1.2823
1.0000
0.78393
0.61822
0.49053
5.1
5.0
4.8
4.7
4.6
1.3074
1.0000
0.76988
0.5954
0.46341
5.5
5.3
5.2
5.1
4.9
45.0
50.0
55.0
60.0
65.0
0.4767
0.40133
0.33894
0.28769
0.24573
3.5
3.4
3.3
3.2
3.1
0.39116
0.31371
0.25338
0.20565
0.16762
4.5
4.3
4.2
4.2
4.1
0.36327
0.28636
0.2262
0.17974
0.1438
4.8
4.8
4.7
4.5
4.4
70.0
75.0
80.0
85.0
90.0
0.21081
0.18147
0.15682
0.13601
0.11838
3.0
3.0
2.9
2.8
2.7
0.13726
0.11279
0.093053
0.077177
0.064263
4.0
3.9
3.8
3.7
3.6
0.1156
0.093296
0.075623
0.061619
0.050414
4.3
4.3
4.2
4.1
3.9
95.0
100.0
105.0
110.0
115.0
0.10342
0.090648
0.079672
0.070236
0.062118
2.7
2.6
2.5
2.5
2.4
0.053678
0.044996
0.037917
0.032063
0.027161
3.6
3.5
3.4
3.4
3.3
0.041532
0.034355
0.028525
0.023774
0.019852
3.8
3.8
3.7
3.7
3.6
120.0
125.0
0.055093
0.048901
2.4
2.3
0.023079
0.01968
3.2
3.2
0.016632
0.014016
3.5
3.4
Please read Cautions and warnings and
Important notes at the end of this document.
120.22
85.48
61.004
43.712
31.459
7.0
6.9
6.8
6.7
6.6
Page 8 of 31
200.55
131.02
87.171
58.988
40.545
8.7
8.3
8.0
7.7
7.4
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
55.0
50.0
45.0
40.0
35.0
2007
2903
2904
B25/100 = 4830 K
B25/100 = 4200 K
B25/100 = 4300 K
RT/R25
α (%/K) RT/R25
α (%/K) RT/R25
α (%/K)
185.87
123.23
82.888
56.544
39.061
8.4
8.1
7.8
7.6
7.3
120.03
82.38
57.248
40.255
28.627
7.7
7.4
7.2
7.0
6.7
121.46
84.439
59.243
41.938
29.947
7.4
7.2
7.1
6.9
6.7
30.0
25.0
20.0
15.0
10.0
27.321
19.326
13.823
10.001
7.3067
7.1
6.8
6.6
6.4
6.4
20.577
14.876
10.88
8.0808
6.0612
6.6
6.4
6.1
5.9
5.8
21.567
15.641
11.466
8.451
6.2927
6.6
6.3
6.2
6.0
5.9
5.0
0.0
5.0
10.0
15.0
5.3454
3.9484
2.9595
2.2358
1.7001
6.2
5.9
5.7
5.6
5.4
4.5649
3.4708
2.6625
2.0599
1.6069
5.6
5.4
5.2
5.1
4.9
4.7077
3.5563
2.7119
2.086
1.6204
5.7
5.5
5.3
5.1
5.0
20.0
25.0
30.0
35.0
40.0
1.3021
1.0000
0.7756
0.60507
0.47498
5.4
5.2
5.0
4.9
4.8
1.2631
1.0000
0.79593
0.63796
0.51467
4.8
4.6
4.5
4.4
4.2
1.2683
1.0000
0.7942
0.63268
0.5074
4.8
4.7
4.6
4.5
4.3
45.0
50.0
55.0
60.0
65.0
0.37533
0.29823
0.23763
0.19041
0.15356
4.7
4.6
4.5
4.4
4.3
0.41887
0.34272
0.28081
0.23141
0.19211
4.1
4.0
3.9
3.8
3.7
0.41026
0.33363
0.27243
0.2237
0.18459
4.2
4.1
4.0
3.9
3.8
70.0
75.0
80.0
85.0
90.0
0.12442
0.10131
0.08286
0.068004
0.056032
4.2
4.1
4.0
3.9
3.8
0.16027
0.13421
0.11288
0.095326
0.080828
3.6
3.5
3.4
3.3
3.2
0.15305
0.12755
0.10677
0.089928
0.076068
3.7
3.6
3.5
3.4
3.3
95.0
100.0
105.0
110.0
115.0
0.046379
0.038533
0.032169
0.026952
0.022658
3.8
3.7
3.6
3.5
3.4
0.068916
0.058989
0.050701
0.043735
0.037778
3.2
3.1
3.0
3.0
2.9
0.064524
0.054941
0.047003
0.040358
0.034743
3.3
3.2
3.1
3.0
3.0
120.0
125.0
130.0
135.0
140.0
0.019111
0.016201
3.3
3.3
0.032736
0.028513
2.8
2.7
0.030007
0.026006
0.022609
0.01972
0.017251
2.9
2.8
2.8
2.7
2.6
145.0
150.0
155.0
0.015139
0.013321
0.011754
2.6
2.5
2.5
Please read Cautions and warnings and
Important notes at the end of this document.
Page 9 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
R/T characteristics
R/T No.
T (°C)
4001
4003
B25/100 = 3950 K
B25/100 = 4450 K
RT/R25
α (%/K) RT/R25
α (%/K)
55.0
50.0
45.0
40.0
35.0
88.052
61.65
43.727
31.395
22.802
7.3
7.0
6.8
6.5
6.3
30.0
25.0
20.0
15.0
10.0
16.742
12.367
9.2353
7.0079
5.3654
6.2
6.0
5.6
5.4
5.4
20.142
14.801
10.976
8.1744
6.1407
6.2
6.1
5.9
5.8
5.7
5.0
0.0
5.0
10.0
15.0
4.126
3.2
2.4986
1.9662
1.5596
5.2
5.0
4.9
4.7
4.6
4.6331
3.5243
2.6995
2.0831
1.6189
5.5
5.4
5.3
5.1
5.0
20.0
25.0
30.0
35.0
40.0
1.2457
1.0000
0.80355
0.65346
0.53456
4.5
4.4
4.2
4.1
4.0
1.2666
1.0000
0.78351
0.62372
0.49937
4.9
4.7
4.6
4.5
4.4
45.0
50.0
55.0
60.0
65.0
0.43966
0.36357
0.30183
0.25189
0.21136
3.9
3.8
3.7
3.6
3.5
0.40218
0.32557
0.26402
0.21527
0.17693
4.3
4.2
4.1
4.0
3.9
70.0
75.0
80.0
85.0
90.0
0.17819
0.15089
0.12833
0.10948
0.093748
3.4
3.3
3.2
3.1
3.0
0.14616
0.12097
0.10053
0.083761
0.070039
3.8
3.7
3.7
3.6
3.5
95.0
100.0
105.0
110.0
115.0
0.080764
0.069842
0.060455
0.052498
0.04574
2.9
2.9
2.9
2.8
2.7
0.058937
0.049777
0.042146
0.035803
0.030504
3.4
3.4
3.3
3.2
3.2
120.0
125.0
130.0
135.0
140.0
0.039972
0.034984
2.7
2.6
0.026067
0.022332
0.019186
0.016515
0.014253
3.1
3.0
3.0
2.9
2.9
145.0
150.0
155.0
0.012367
0.010758
0.0093933
2.8
2.8
2.7
Please read Cautions and warnings and
Important notes at the end of this document.
103.81
73.707
52.723
37.988
27.565
6.8
6.7
6.6
6.5
6.4
Page 10 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
Taping and packing
1
Taping of SMD NTC thermistors
Tape and reel packing according to IEC 60286-3.
Tape material: Cardboard or blister, tape width 8 ±0.30 mm
2
Reel packing
Dimensions in mm
8-mm tape
180-mm reel
330-mm reel
A
180 +0/3
330 +0/2.0
W1
8.4 +1.5/0
8.4 +1.5/0
W2
14.4 max.
14.4 max.
Leader, trailer
Please read Cautions and warnings and
Important notes at the end of this document.
Page 11 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
Packing units for discrete chip
Case size
Chip thickness
inch/mm
0402/1005
0603/1608
0805/2012
1206/3216
3
th
0.5 mm
0.8 mm
0.8 mm
1.2 mm
0.8 mm
1.2 mm
Cardboard tape Blister tape
W
8 mm
8 mm
W
8 mm
8 mm
8 mm
8 mm
8 mm
∅ 180-mm reel ∅ 330-mm reel
pcs.
10000
4000
2000/ 4000
3000
2000
4000
pcs.
50000
16000
16000
12000
12000
12000
Packing codes
The last two digits of the complete ordering code state the packing mode:
Last two digits
60
SMD
Cardboard tape
180-mm reel packing
62
SMD
Blister tape
180-mm reel packing
70
SMD
Cardboard tape
330-mm reel packing
72
SMD
Blister tape
330-mm reel packing
Please read Cautions and warnings and
Important notes at the end of this document.
Page 12 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
4
K164
Taping of radial leaded NTC thermistors
Dimensions and tolerances
Lead spacing F = 2.5 mm and 5.0 mm (taping to IEC 60286-2)
Dimensions (mm)
w
th
d
P0
P1
F
∆h
∆p
W
W0
W1
W2
H
H0
H1
D0
t
L
L1
Lead
spacing
2.5 mm
11.0
5.0
0.5/0.6
12.7
5.1
2.5
0
0
18.0
5.5
9.0
3.0
18.0
16.0
32.2
4.0
0.9
11.0
4.0
Lead
spacing
5 mm
11.5
6.0
0.5/0.6
12.7
3.85
5.0
0
0
18.0
5.5
9.0
3.0
18.0
16.0
32.2
4.0
0.9
11.0
4.0
Please read Cautions and warnings and
Important notes at the end of this document.
Tolerance of
lead spacing
2.5/5 mm
max.
max.
±0.05
±0.3
±0.7
+0.6/0.1
±2.0
±1.3
±0.5
min.
+0.75/0.5
max.
+2.0/0
±0.5
max.
±0.2
max.
max.
max.
Remarks
±1 mm / 20 sprocket holes
measured at top of component body
peel-off force ≥5 N
without wires
Page 13 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
Types of packing
Ammo packing
Ammo
type
x
y
z
I
80
240
210
Packing unit: 1000 - 2000 pcs./reel
Reel packing
Packing unit: 1000 - 2000 pcs./reel
Reel dimensions (in mm)
Reel type
d
f
n
w
I
360 max.
31 ±1
approx. 45
54 max.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 14 of 31
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 5 mm
B57164K
K164
Cassette packing
Packing unit: 1000 - 2000 pcs./cassette
Bulk packing
The components are packed in cardboard boxes, the size of which depends on the order quantity.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 15 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
5
K164
Packing codes
The last two digits of the complete ordering code state the packing mode:
Last two digits
00, 01, 02, 03,04,
05, 06, 07, 08
Bulk
40, 41
Bulk
45
Bulk
50
Radial leads, kinked
Cardboard tape
Cassette packing
51
Radial leads, kinked
Cardboard tape
360-mm reel packing
52
Radial leads, straight
Cardboard tape
Cassette packing
53
Radial leads, straight
Cardboard tape
360-mm reel packing
54
Radial leads, kinked
Cardboard tape
AMMO packing
55
Radial leads, straight
Cardboard tape
AMMO packing
(If no packing code is indicated, this corresponds to 40)
Example 1:
B57164K0102J000
B57164K0102J052
Bulk
Cardboard tape, cassette packing
Example 2:
B57881S0103F002
B57881S0103F251
Bulk
Cardboard tape, reel packing
Please read Cautions and warnings and
Important notes at the end of this document.
Page 16 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
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:
Bath temperature
Dip soldering
Iron soldering
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.
1.1.1
Wave soldering
Temperature characteristic at component terminal with dual wave soldering
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
Please read Cautions and warnings and
Important notes at the end of this document.
Page 17 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
K164
should be used. In addition, soldering methods should be employed which permit short soldering
times.
1.3
SMD NTC thermistors
SMD NTC thermistors can be provided with a nickel barrier termination or on special request with
silver-palladium termination. The use of no-clean solder products is recommended. In any case
mild, non-activated fluxes should be used. Flux residues after soldering should be minimized.
SMD NTCs with AgPd termination are not approved for lead-free soldering.
Nickel barrier termination
Figure 1
SMD NTC thermistors, structure of nickel
barrier termination
The nickel barrier layer of the silver/nickel/tin termination (see figure 1) prevents leaching of the
silver base metallization layer. This allows great flexibility in the selection of soldering parameters.
The tin prevents the nickel layer from oxidizing and thus ensures better wetting by the solder. The
nickel barrier termination is tested for all commonly-used soldering methods according to IEC
60068-2-58. Insufficient preheating may cause ceramic cracks. Rapid cooling by dipping in solvent is not recommended.
The following test and process conditions apply for nickel barrier termination.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 18 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
1.3.1
K164
Solderability (test to IEC 60068-2-58)
Preconditioning: Immersion into flux F-SW 32.
Evaluation criterion: Wetting of soldering areas ≥95%.
Solder
Bath temperature (°C)
Dwell time (s)
SnPb 60/40
215 ±3
3 ±0.3
SnAg (3.0 ... 4.0), Cu (0.5 ... 0.9)
245 ±3
3 ±0.3
1.3.2
Resistance to soldering heat (test to IEC 60068-2-58)
Preconditioning: Immersion into flux F-SW 32.
Evaluation criterion: Leaching of side edges ≤1/3.
Solder
Bath temperature (°C)
Dwell time (s)
SnPb 60/40
260 ±5
10 ±1
SnAg (3.0 ... 4.0), Cu (0.5 ... 0.9)
260 ±5
10 ±1
1.3.3
Reflow soldering
Temperature ranges for reflow soldering acc. to IEC 60068-2-58 recommendations.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 19 of 31
Temperature measurement and compensation
B57164K
Leaded NTC thermistors, lead spacing 5 mm
Profile feature
Preheat and soak
- Temperature min
- Temperature max
- Time
K164
Sn-Pb eutectic assembly
Pb-free assembly
Tsmin
Tsmax
tsmin to tsmax
100 °C
150 °C
60 ... 120 s
150 °C
200 °C
60 ... 120 s
Average ramp-up rate
Tsmax to Tp
3 °C/ s max.
3 °C/ s max.
Liquidous temperature
Time at liquidous
TL
tL
183 °C
40 ... 150 s
217 °C
40 ... 150 s
Peak package body temperature
Tp
215 °C ... 260 °C1)
235 °C ... 260 °C
Time above (TP 5 °C)
tp
10 ... 40 s
10 ... 40 s
Average ramp-down rate
Tp to Tsmax
6 °C/ s max.
6 °C/ s max.
max. 8 minutes
max. 8 minutes
Time 25 °C to peak temperature
1) Depending on package thickness.
Notes:
All temperatures refer to topside of the package, measured on the package body
surface.
Number of reflow cycles: 3
Iron soldering should be avoided, hot air methods are recommended for repair
purposes.
Solder joint profiles for silver/nickel/tin terminations
Please read Cautions and warnings and
Important notes at the end of this document.
Page 20 of 31
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 5 mm
1.3.4
B57164K
K164
Recommended geometry of solder pads
Recommended maximum dimensions (mm)
Case size
inch/mm
A
B
C
0402/1005
0.6
0.6
1.7
0603/1608
1.0
1.0
3.0
0805/2012
1.3
1.2
3.4
1206/3216
1.8
1.2
4.5
2
Conductive adhesion
An alternative to soldering for silver-palladium terminated components is the gluing of thermistors
with conductive adhesives. The benefit of this method is that it involves no thermal stress. The
adhesives used must be chemically inert.
3
Clamp contacting
Pressure contacting by means of clamps is particularly suitable for applications involving frequent
switching and high turn-on powers.
4
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.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 21 of 31
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 5 mm
Tensile strength:
B57164K
K164
Test Ua1:
Value of applied force for Ua1 test:
Diameter (d) of
Force with tolerance of ±10%
corresponding round 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
Bending strength: Test Ub:
Two 90°-bends in opposite directions
Value of applied force for Ub test:
Diameter (d) of
Force with tolerance of ±10%
corresponding round leads
∅ ≤ 0.25 mm
0.5 N
0.25 < ∅ ≤ 0.35 mm
1.25 N
0.35 < ∅ ≤ 0.50 mm
2.5 N
0.50 < ∅ ≤ 0.80 mm
5N
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 +4 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.
Please read Cautions and warnings and
Important notes at the end of this document.
Page 22 of 31
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 5 mm
5
B57164K
K164
Sealing and potting
Sealing or potting processes can affect the reliability of the component.
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.
As thermistors are temperature sensitive components it should be considered that molding can affect the thermal surrounding and may influence e.g. the response time.
Extensive testing is encouraged in order to determine whether overmolding or potting influences
the functionality and/ or reliability of the component.
6
Cleaning
Cleaning processes can affect the reliability of the component.
If cleaning is necessary, mild cleaning agents are recommended. Cleaning agents based on water are not allowed. Washing processes may damage the product due to the possible static or
cyclic mechanical loads (e.g. ultrasonic cleaning). They may cause cracks which might lead to reduced reliability and/ or lifetime.
7
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.
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