NTC thermistors for
temperature measurement
Leaded NTCs,
lead spacing 2.5 mm
Series/Type:
B57891
Date:
March 2006
EPCOS AG 2006. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Applications
Heating systems
Automotive electronics
Features
Favorable price/ performance ratio
Rugged design, epoxy resin encapsulation
Leads: copper-clad Fe wire, tinned
UL approval (E69802)
Options
Lead spacing 5 mm available on request
Delivery mode
Bulk (standard),
cardboard tape, reeled or in Ammo pack
Dimensional drawing
Dimensions in mm
Approx. weight 0.2 g
General technical data
Climatic category
(IEC 60068-1)
55/155/56
Max. power
(at 25
C)
P
25
200
mW
Resistance tolerance
R
R
/R
R
1,
3,
5
%
Rated temperature
T
R
25
C
Dissipation factor
(in air)
th
approx. 4
mW/K
Thermal cooling time constant
(in air)
c
approx. 15
s
Heat capacity
C
th
approx. 60
mJ/K
Electrical specification and ordering codes
R
25
No. of R/T
characteristic
B
25/100
K
Ordering code
+ =
Resistance tolerance
F =
1%
H =
3%
J =
5%
2.2 k
1008
3560
1.5%
B57891S0222+008
5 k
2003
3980
1.0%
B57891S0502+008
10 k
4901
3950
1.0%
B57891S0103+008
20 k
2904
4300
1.0%
B57891S0203+008
100 k
4003
4450
1.0%
B57891S0104+008
Temperature measurement
B57891
Leaded NTCs, lead spacing 2.5 mm
S891
Page 2 of 25
Please read Important notes and
Cautions and warnings at the end of this document.
Reliability data
Test
Standard
Test conditions
R
25
/R
25
(typical)
Remarks
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
T: 155
C
t: 1000 h
< 3%
No visible
damage
Storage in damp
heat, steady state
IEC
60068-2-78
Temperature of air: 40
C
Relative humidity of air: 93%
Duration: 56 days
< 1%
No visible
damage
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature:
55
C
Upper test temperature: 155
C
Number of cycles: 100
< 2%
No visible
damage
Endurance
P
max
: 200 mW
t: 1000 h
< 3%
No visible
damage
Long-term stability
(empirical value)
Temperature: 70
C
t: 10000 h
< 3%
No visible
damage
Temperature measurement
B57891
Leaded NTCs, lead spacing 2.5 mm
S891
Page 3 of 25
Please read Important notes and
Cautions and warnings at the end of this document.
R/T characteristics
B57891S0222F008
R/T No.
1008
T (
C)
B
25/100
= 3560 K, R
25
= 2200
, T
R
= 25
C,
R
R
/R
R
=
1%
R
nom
[
]
R
min
[
]
R
max
[
]
R
R
/R
R
[
%]
T[
C]
(%/K)
55.0
116830
107930
125730
7.6
1.2
6.1
50.0
86499
80383
92614
7.1
1.2
6.0
45.0
64515
60293
68738
6.5
1.1
5.8
40.0
48466
45537
51395
6.0
1.1
5.7
35.0
36666
34627
38706
5.6
1.0
5.5
30.0
27931
26506
29356
5.1
0.9
5.4
25.0
21395
20398
22392
4.7
0.9
5.2
20.0
16538
15837
17238
4.2
0.8
5.1
15.0
12838
12346
13329
3.8
0.8
4.9
10.0
10051
9706
10396
3.4
0.7
4.8
5.0
7931
7689
8173
3.1
0.7
4.7
0.0
6306
6137
6476
2.7
0.6
4.5
5.0
5040
4922
5157
2.3
0.5
4.4
10.0
4056
3975
4137
2.0
0.5
4.3
15.0
3282
3228
3337
1.7
0.4
4.1
20.0
2674
2638
2710
1.4
0.3
4.0
25.0
2200
2178
2222
1.0
0.3
3.9
30.0
1825
1801
1850
1.3
0.4
3.8
35.0
1510
1485
1535
1.6
0.4
3.7
40.0
1256
1232
1280
1.9
0.5
3.6
45.0
1056
1033
1079
2.2
0.6
3.5
50.0
892.0
870.3
913.7
2.4
0.7
3.4
55.0
751.7
731.5
771.9
2.7
0.8
3.3
60.0
636.9
618.3
655.6
2.9
0.9
3.2
65.0
543.7
526.5
560.9
3.2
1.0
3.1
70.0
466.0
450.2
481.9
3.4
1.1
3.1
75.0
400.3
385.8
414.8
3.6
1.2
3.0
80.0
345.0
331.7
358.2
3.8
1.3
2.9
85.0
299.0
286.9
311.1
4.1
1.4
2.8
90.0
260.1
249.0
271.2
4.3
1.5
2.8
95.0
227.5
217.3
237.6
4.5
1.7
2.7
100.0
199.6
190.3
208.9
4.6
1.8
2.6
105.0
175.2
166.7
183.7
4.8
1.9
2.6
110.0
154.2
146.5
162.0
5.0
2.0
2.5
115.0
136.2
129.1
143.2
5.2
2.1
2.4
120.0
120.5
114.0
127.0
5.4
2.3
2.4
125.0
107.2
101.2
113.1
5.5
2.4
2.3
130.0
95.51
90.05
101.0
5.7
2.5
2.3
135.0
85.19
80.18
90.19
5.9
2.6
2.2
Temperature measurement
B57891
Leaded NTCs, lead spacing 2.5 mm
S891
Page 4 of 25
Please read Important notes and
Cautions and warnings at the end of this document.
B57891S0222F008
R/T No.
1008
T (
C)
B
25/100
= 3560 K, R
25
= 2200
, T
R
= 25
C,
R
R
/R
R
=
1%
R
nom
[
]
R
min
[
]
R
max
[
]
R
R
/R
R
[
%]
T[
C]
(%/K)
140.0
76.15
71.56
80.75
6.0
2.8
2.2
145.0
68.31
64.08
72.53
6.2
2.9
2.1
150.0
61.40
57.51
65.29
6.3
3.0
2.1
155.0
55.42
51.83
59.02
6.5
3.2
2.0
B57891S0222H008
R/T No.
1008
T (
C)
B
25/100
= 3560 K, R
25
= 2200
, T
R
= 25
C,
R
R
/R
R
=
3%
R
nom
[
]
R
min
[
]
R
max
[
]
R
R
/R
R
[
%]
T[
C]
(%/K)
55.0
116830
105590
128060
9.6
1.6
6.1
50.0
86499
78653
94344
9.1
1.5
6.0
45.0
64515
59002
70028
8.5
1.5
5.8
40.0
48466
44568
52364
8.0
1.4
5.7
35.0
36666
33893
39439
7.6
1.4
5.5
30.0
27931
25947
29914
7.1
1.3
5.4
25.0
21395
19971
22820
6.7
1.3
5.2
20.0
16538
15507
17568
6.2
1.2
5.1
15.0
12838
12090
13585
5.8
1.2
4.9
10.0
10051
9505
10597
5.4
1.1
4.8
5.0
7931
7530
8332
5.1
1.1
4.7
0.0
6306
6011
6602
4.7
1.0
4.5
5.0
5040
4821
5258
4.3
1.0
4.4
10.0
4056
3894
4218
4.0
0.9
4.3
15.0
3282
3162
3403
3.7
0.9
4.1
20.0
2674
2584
2764
3.4
0.8
4.0
25.0
2200
2134
2266
3.0
0.8
3.9
30.0
1825
1764
1887
3.3
0.9
3.8
35.0
1510
1455
1565
3.6
1.0
3.7
40.0
1256
1207
1305
3.9
1.1
3.6
45.0
1056
1012
1100
4.2
1.2
3.5
50.0
892.0
852.4
931.5
4.4
1.3
3.4
55.0
751.7
716.5
787.0
4.7
1.4
3.3
60.0
636.9
605.5
668.3
4.9
1.5
3.2
65.0
543.7
515.6
571.8
5.2
1.6
3.1
70.0
466.0
440.9
491.2
5.4
1.8
3.1
75.0
400.3
377.8
422.8
5.6
1.9
3.0
80.0
345.0
324.8
365.1
5.8
2.0
2.9
85.0
299.0
280.9
317.1
6.1
2.1
2.8
90.0
260.1
243.8
276.4
6.3
2.3
2.8
Temperature measurement
B57891
Leaded NTCs, lead spacing 2.5 mm
S891
Page 5 of 25
Please read Important notes and
Cautions and warnings at the end of this document.
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