NTC thermistors for
temperature measurement
Leaded NTC thermistors,
lead spacing 2.5 mm
Series/Type:
Date:
B57891M
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
Leaded NTC thermistors, lead spacing 2.5 mm
B57891M
M891
Applications
Temperature measurement and
compensation
Features
Wide resistance range
Cost-effective
Lacquer-coated thermistor disk
Leads: copper-clad Fe wire, tinned
Marked with resistance and tolerance
Options
Lead spacing 5 mm available on request
Delivery mode
Bulk (standard), cardboard tape, reeled or in
Ammo pack on request
Dimensional drawing
Dimensions in mm
Approx. weight 200 mg
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)
40/125/56
200
±5, ±10
25
approx. 3.5
approx. 12
approx. 40
(in air)
(in air)
P
25
∆R
R
/R
R
T
R
δ
th
τ
c
C
th
mW
%
°C
mW/K
s
mJ/K
Electrical specification and ordering codes
R
25
Ω
1k
1.5 k
2.2 k
3.3 k
4.7 k
6.8 k
10 k
15 k
22 k
+ = Resistance tolerance
J =
±5%
K =
±10%
No. of R/T
characteristic
1009
1008
1013
2003
2003
2003
4901
2004
2904
B
25/100
K
3930
±3%
3560
±3%
3900
±3%
3980
±3%
3980
±3%
3980
±3%
3950
±3%
4100
±3%
4300
±3%
Ordering code
B57891M0102+000
B57891M0152+000
B57891M0222+000
B57891M0332+000
B57891M0472+000
B57891M0682+000
B57891M0103+000
B57891M0153+000
B57891M0223+000
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 29
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 2.5 mm
B57891M
M891
R
25
Ω
33 k
47 k
100 k
150 k
220 k
330 k
470 k
+ = Resistance tolerance
J =
±5%
K =
±10%
No. of R/T
characteristic
2904
4012
4003
2005
2005
2007
2006
B
25/100
K
4300
±3%
4355
±3%
4450
±3%
4600
±3%
4600
±3%
4830
±3%
5000
±3%
Ordering code
B57891M0333+000
B57891M0473+000
B57891M0104+000
B57891M0154+000
B57891M0224+000
B57891M0334+000
B57891M0474+000
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 3%
Remarks
No visible
damage
Storage in damp
heat, steady state
Rapid temperature
cycling
Endurance
Long-term stability
(empirical value)
Note
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: 56 days
IEC
Lower test temperature: 40
°C
60068-2-14 Upper test temperature: 125
°C
Number of cycles: 100
P
max
: 200 mW
t: 1000 h
Temperature: 70
°C
t: 10000 h
< 2%
No visible
damage
No visible
damage
No visible
damage
No visible
damage
< 2%
< 3%
< 5%
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 3 of 29
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 2.5 mm
B57891M
M891
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
1008
1009
1013
B
25/100
= 3560 K
B
25/100
= 3930 K
B
25/100
= 3900 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
0.043415
0.038722
0.034615
0.031048
0.02791
0.025193
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
2.3
2.2
2.2
2.1
2.1
2.0
85.423
60.781
43.65
31.629
23.118
17.04
12.649
9.4864
7.1545
5.4479
4.1732
3.2256
2.5147
1.9763
1.5649
1.2481
1.0000
0.80956
0.65726
0.53697
0.44169
0.36534
0.30327
0.25313
0.21271
0.17962
0.15219
0.12949
0.11067
0.094952
0.08178
0.07069
0.061383
0.053486
0.04673
0.040955
0.036006
0.031747
0.028097
0.024935
0.022176
0.019772
0.017683
7.0
6.8
6.6
6.4
6.2
6.1
5.9
5.8
5.6
5.4
5.2
5.1
4.9
4.8
4.6
4.5
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.5
3.4
3.4
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.7
2.7
2.6
2.5
2.5
2.4
2.4
2.3
2.3
2.2
77.285
54.938
39.507
28.722
21.099
15.652
11.715
8.8541
6.7433
5.1815
4.0099
3.1283
2.4569
1.9438
1.5475
1.2403
1.0000
0.81104
0.66146
0.54254
0.44727
0.37067
0.30865
0.25825
0.21707
0.18323
0.15535
0.13223
0.11302
0.096951
0.083487
0.072139
0.062559
0.054425
0.047508
0.041594
0.036532
7.0
6.7
6.5
6.3
6.1
5.9
5.7
5.6
5.4
5.2
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
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.8
2.7
2.6
2.6
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 29
Temperature measurement and compensation
Leaded NTC thermistors, lead spacing 2.5 mm
B57891M
M891
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
1008
1009
1013
B
25/100
= 3560 K
B
25/100
= 3930 K
B
25/100
= 3900 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
0.02279
2.0
0.020667
2.0
0.01878
0.01709
0.015582
0.014227
0.013012
0.011934
0.010964
0.0101
0.0093191
0.0085949
0.0079384
0.0073411
0.006798
0.0063087
0.0058623
0.0054487
0.0050705
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
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 29
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