NTC thermistors for
temperature measurement
SMD NTC thermistors,
case size 1206 (3216), standard series
Series/Type:
Date:
B57621C5
January 2016
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information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement and compensation
SMD NTC thermistors, case size 1206 (3216)
B57621C5
Standard series
Applications
Temperature measurement and
compensation
Features
SMD NTC with/ without inner electrodes
Nickel barrier termination
Excellent long-term aging stability in high
temperature environment
Options
Alternative resistance ratings, resistance
tolerances and B value tolerances available
on request.
Delivery mode
Blister tape, 180-mm reel (standard)
General technical data
Operating temperature range
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Thermal cooling time constant
Heat capacity
Dimensional drawing
Dimensions in mm
Approx. weight 18 mg
T
op
(at 25
°C,
on PCB) P
251)
∆R
R
/R
R
T
R
(on PCB)
δ
th1)
(on PCB)
τ
c1)
C
th1)
55 ... 125
300
±5, ±10
25
approx. 5
approx. 10
approx. 50
°C
mW
%
°C
mW/K
s
mJ/K
Electrical specification and ordering codes
R
25
Ω
1.0 k
4.7 k
10 k
15 k
∆R
R
/R
R
%
±5, ±10
±5, ±10
±5, ±10
±5, ±10
No. of R/T
characteristic
3206
1309
1010
1008
B
25/50
K
3420
3430
3470
3480
B
25/85
K
3440
3500
3510
3550
B
25/100
K
3450
±3%
3520
±3%
3530
±3%
3560
±3%
Ordering code
B57621C5102+062
B57621C5472+062
B57621C5103+062
B57621C5153+062
+ = Resistance tolerance
J =
±5%
K =
±10%
1) Depends on mounting situation
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 21
Temperature measurement and compensation
SMD NTC thermistors, case size 1206 (3216)
B57621C5
Standard series
Reliability data
SMD NTC thermistors are tested in accordance with IEC 60068. The parts are mounted on a
standardized PCB in accordance with IEC 60539-1.
Test
Storage in
dry heat
Standard
IEC
60068-2-2
JIS C 0021
Test conditions
∆R
25
/R
25
(typical)
< 3%
1)
Remarks
Storage in damp
heat, steady state
Rapid temperature
cycling
Endurance
Solderability
Storage at upper
category temperature
T: (125
±2) °C
t: 1000 h
IEC
Temperature of air: (40
±2) °C
60068-2-78 Relative humidity of air:
JIS C 0022 (93 +2/ 3)%
Duration: 21 days
IEC
Lower test temperature: 55
°C
60068-2-14 Upper test temperature: 125
°C
JIS C 0025 Number of cycles: 10
P
max
: 300 mW
T: (65
±2) °C
t: 1000 h
IEC
Solderability:
60068-2-58 (215
±3) °C,
(3
±0.3)
s
JIS C 0054 (245
±5) °C,
(3
±0.3)
s
Resistance to soldering heat:
(260
±5) °C,
(10
±1)
s
Reflow soldering profile
Wave soldering profile
< 3%
No visible
damage
< 3%
< 5%
95% of
terminations
wetted
Resistance drift
after soldering
< 5%
1) Except type B57621C5102+062 and B57621C5472+062
∆R
25
/R
25
: < 6%
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 21
Temperature measurement and compensation
SMD NTC thermistors, case size 1206 (3216)
B57621C5
Standard series
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
1008
1010
1309
B
25/100
= 3560 K
B
25/100
= 3530 K
B
25/100
= 3520 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
53.104
39.318
29.325
22.03
16.666
12.696
9.7251
7.5171
5.8353
4.5686
3.605
2.8665
2.2907
1.8438
1.492
1.2154
1.0000
0.82976
0.68635
0.57103
0.48015
0.40545
0.3417
0.28952
0.24714
0.21183
0.18194
0.1568
0.13592
0.11822
0.1034
0.090741
0.079642
0.070102
0.061889
0.054785
0.048706
6.1
6.0
5.8
5.7
5.5
5.4
5.2
5.1
4.9
4.8
4.7
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
3.1
3.1
3.0
2.9
2.8
2.8
2.7
2.6
2.6
2.5
2.4
2.4
2.3
52.826
38.643
28.574
21.346
16.1
12.256
9.4071
7.2862
5.6835
4.4698
3.5385
2.8222
2.2649
1.83
1.4872
1.2161
1.0000
0.82677
0.68708
0.57401
0.48181
0.40638
0.34427
0.29296
0.25035
0.21478
0.18501
0.15995
0.13881
0.12088
0.10563
0.092597
0.081442
0.071842
0.063571
0.056407
0.050196
6.4
6.1
5.9
5.7
5.5
5.4
5.2
5.0
4.9
4.7
4.6
4.5
4.3
4.2
4.1
4.0
3.9
3.8
3.6
3.5
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
48.46
35.8
26.694
20.085
15.247
11.674
9.0124
7.0136
5.5001
4.3451
3.4569
2.7688
2.2321
1.8105
1.4773
1.2122
1.0000
0.82924
0.69105
0.57861
0.48666
0.4111
0.34872
0.29699
0.2539
0.21786
0.18759
0.16208
0.1405
0.12217
0.10656
0.093213
0.081767
0.071922
0.063428
0.056078
0.049702
6.1
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
3.3
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 4 of 21
Temperature measurement and compensation
SMD NTC thermistors, case size 1206 (3216)
B57621C5
Standard series
R/T characteristics
R/T No.
3206
T (°C) B
25/100
= 3450 K
T (°C)
R
T
/R
25
α
(%/K)
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
59.147
42.651
31.088
22.903
17.052
12.827
9.7461
7.477
5.7897
4.5234
3.5643
2.8316
2.2671
6.7
6.4
6.2
6.0
5.8
5.6
5.4
5.2
5.0
4.9
4.7
4.5
4.4
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
B
25/100
= 3450 K
T (°C)
R
T
/R
25
α
(%/K)
1.8287
1.4855
1.2149
1.0000
0.82816
0.68985
0.57784
0.48658
0.41181
0.3502
0.29918
0.25672
0.2212
4.2
4.1
4.0
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
2.9
75.0
80.0
85.0
90.0
95.0
100.0
105.0
110.0
115.0
120.0
125.0
B
25/100
= 3450 K
R
T
/R
25
α
(%/K)
0.19136
0.16618
0.14484
0.12668
0.11117
0.09787
0.086428
0.076549
0.067992
0.060555
0.054073
2.9
2.8
2.7
2.7
2.6
2.5
2.5
2.4
2.3
2.3
2.2
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 21
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