NTC thermistors for
temperature measurement
Leaded NTC thermistors,
lead spacing 2.5 mm
Series/Type: B57891S
Date: March 2013
© EPCOS AG 2013. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
Applications
Dimensional drawing
Temperature measurement and
compensation
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 on request
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
200 mW
25
Resistance tolerance ∆RR/RR±1, ±3, ±5 %
Rated temperature T
Dissipation factor (in air) δ
Thermal cooling time constant (in air) τ
Heat capacity C
th
c
25 °C
R
approx. 4 mW/K
approx. 15 s
approx. 60 mJ/K
th
Electrical specification and ordering codes
R
25
Ω
No. of R/T
characteristic
B
K
25/100
Ordering code
2.2 k 1008 3560 ±1.5% B57891S0222+008
5 k 2003 3980 ±1% B57891S0502+008
10 k 4901 3950 ±1% B57891S0103+008
20 k 2904 4300 ±1% B57891S0203+008
100 k 4003 4450 ±1% B57891S0104+008
+ = Resistance tolerance
F = ±1%
H = ±3%
J = ±5%
Important notes at the end of this document.
Page 2 of 26Please read Cautions and warnings and
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
Reliability data
Test Standard Test conditions ∆R25/R
25
(typical)
Storage in
dry heat
IEC
60068-2-2
Storage at upper
category temperature
< 3% No visible
T: 155 °C
t: 1000 h
Storage in damp
heat, steady state
IEC
60068-2-78
Temperature of air: 40 °C
Relative humidity of air: 93%
< 1% No visible
Duration: 56 days
Rapid temperature
cycling
IEC
60068-2-14
Lower test temperature: 55 °C
Upper test temperature: 155 °C
< 2% No visible
Number of cycles: 100
Endurance P
: 200 mW
max
< 3% No visible
t: 1000 h
Long-term stability
(empirical value)
Temperature: 70 °C
t: 10000 h
< 3% No visible
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.
Remarks
damage
damage
damage
damage
damage
Important notes at the end of this document.
Page 3 of 26Please read Cautions and warnings and
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
R/T characteristics
R/T No.
T (°C) B
1008 2003 2904
= 3560 K B
25/100
RT/R
25
α (%/K) RT/R
= 3980 K B
25/100
25
25/100
α (%/K) RT/R
= 4300 K
25
55.0 53.104 6.1 97.578 7.5 121.46 7.4
50.0 39.318 6.0 67.65 7.2 84.439 7.2
45.0 29.325 5.8 47.538 7.0 59.243 7.1
40.0 22.03 5.7 33.831 6.7 41.938 6.9
35.0 16.666 5.5 24.359 6.5 29.947 6.7
30.0 12.696 5.4 17.753 6.3 21.567 6.6
25.0 9.7251 5.2 13.067 6.0 15.641 6.3
20.0 7.5171 5.1 9.7228 5.8 11.466 6.2
15.0 5.8353 4.9 7.3006 5.6 8.451 6.0
10.0 4.5686 4.8 5.5361 5.5 6.2927 5.9
5.0 3.605 4.7 4.2332 5.3 4.7077 5.7
0.0 2.8665 4.5 3.266 5.1 3.5563 5.5
5.0 2.2907 4.4 2.5392 5.0 2.7119 5.3
10.0 1.8438 4.3 1.9902 4.8 2.086 5.1
15.0 1.492 4.1 1.5709 4.7 1.6204 5.0
20.0 1.2154 4.0 1.2492 4.5 1.2683 4.8
25.0 1.0000 3.9 1.0000 4.4 1.0000 4.7
30.0 0.82976 3.8 0.80575 4.3 0.7942 4.6
35.0 0.68635 3.7 0.65326 4.1 0.63268 4.5
40.0 0.57103 3.6 0.5329 4.0 0.5074 4.3
45.0 0.48015 3.5 0.43715 3.9 0.41026 4.2
50.0 0.40545 3.4 0.36064 3.8 0.33363 4.1
55.0 0.3417 3.3 0.29908 3.7 0.27243 4.0
60.0 0.28952 3.2 0.24932 3.6 0.2237 3.9
65.0 0.24714 3.1 0.20886 3.5 0.18459 3.8
70.0 0.21183 3.1 0.17578 3.4 0.15305 3.7
75.0 0.18194 3.0 0.14863 3.3 0.12755 3.6
80.0 0.1568 2.9 0.12621 3.2 0.10677 3.5
85.0 0.13592 2.8 0.10763 3.1 0.089928 3.4
90.0 0.11822 2.8 0.092159 3.1 0.076068 3.3
95.0 0.1034 2.7 0.079225 3.0 0.064524 3.3
100.0 0.090741 2.6 0.068356 2.9 0.054941 3.2
105.0 0.079642 2.6 0.059247 2.8 0.047003 3.1
110.0 0.070102 2.5 0.051531 2.8 0.040358 3.0
115.0 0.061889 2.4 0.044921 2.7 0.034743 3.0
120.0 0.054785 2.4 0.039282 2.7 0.030007 2.9
125.0 0.048706 2.3 0.034387 2.6 0.026006 2.8
130.0 0.043415 2.3 0.030186 2.5 0.022609 2.8
135.0 0.038722 2.2 0.02665 2.5 0.01972 2.7
140.0 0.034615 2.2 0.023594 2.4 0.017251 2.6
145.0 0.031048 2.1 0.020931 2.4 0.015139 2.6
150.0 0.02791 2.1 0.018616 2.3 0.013321 2.5
155.0 0.025193 2.0 0.016612 2.3 0.011754 2.5
α (%/K)
Important notes at the end of this document.
Page 4 of 26Please read Cautions and warnings and
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
R/T No.
T (°C) B
1008 2003 2904
= 3560 K B
25/100
RT/R
25
160.0 0.02279 2.0
165.0 0.020667 2.0
170.0 0.01878 1.9
175.0 0.01709 1.9
180.0 0.015582 1.8
185.0 0.014227 1.8
190.0 0.013012 1.8
195.0 0.011934 1.7
200.0 0.010964 1.7
205.0 0.0101 1.7
210.0 0.0093191 1.6
215.0 0.0085949 1.6
220.0 0.0079384 1.6
225.0 0.0073411 1.5
230.0 0.006798 1.5
235.0 0.0063087 1.5
240.0 0.0058623 1.5
245.0 0.0054487 1.4
250.0 0.0050705 1.4
25/100
α (%/K) RT/R
= 3980 K B
25
α (%/K) RT/R
25/100
= 4300 K
25
α (%/K)
Important notes at the end of this document.
Page 5 of 26Please read Cautions and warnings and
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
R/T characteristics
R/T No.
T (°C) B
4003 4901
= 4450 K B
25/100
RT/R
25
α (%/K) RT/R
25/100
= 3950 K
25
55.0 103.81 6.8 87.89 7.1
50.0 73.707 6.7 61.759 6.9
45.0 52.723 6.6 43.934 6.7
40.0 37.988 6.5 31.618 6.5
35.0 27.565 6.4 23.006 6.3
30.0 20.142 6.2 16.915 6.1
25.0 14.801 6.1 12.555 5.9
20.0 10.976 5.9 9.4143 5.7
15.0 8.1744 5.8 7.1172 5.5
10.0 6.1407 5.7 5.4308 5.4
5.0 4.6331 5.5 4.1505 5.2
0.0 3.5243 5.4 3.2014 5.0
5.0 2.6995 5.3 2.5011 4.9
10.0 2.0831 5.1 1.9691 4.7
15.0 1.6189 5.0 1.5618 4.6
20.0 1.2666 4.9 1.2474 4.5
25.0 1.0000 4.7 1.0000 4.3
30.0 0.78351 4.6 0.808 4.2
35.0 0.62372 4.5 0.6569 4.1
40.0 0.49937 4.4 0.5372 4.0
45.0 0.40218 4.3 0.44235 3.9
50.0 0.32557 4.2 0.3661 3.8
55.0 0.26402 4.1 0.30393 3.7
60.0 0.21527 4.0 0.25359 3.6
65.0 0.17693 3.9 0.21283 3.5
70.0 0.14616 3.8 0.17942 3.4
75.0 0.12097 3.7 0.15183 3.3
80.0 0.10053 3.7 0.12901 3.2
85.0 0.083761 3.6 0.11002 3.1
90.0 0.070039 3.5 0.094179 3.1
95.0 0.058937 3.4 0.080896 3.0
100.0 0.049777 3.4 0.069722 2.9
105.0 0.042146 3.3 0.060397 2.9
110.0 0.035803 3.2 0.052493 2.8
115.0 0.030504 3.2 0.045733 2.7
120.0 0.026067 3.1 0.039963 2.7
125.0 0.022332 3.0 0.035059 2.6
130.0 0.019186 3.0 0.030844 2.6
135.0 0.016515 2.9 0.027192 2.5
140.0 0.014253 2.9 0.024034 2.4
145.0 0.012367 2.8 0.021285 2.4
150.0 0.010758 2.8 0.018895 2.4
155.0 0.0093933 2.7 0.016813 2.3
α (%/K)
Important notes at the end of this document.
Page 6 of 26Please read Cautions and warnings and
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
Taping and packing
1 Taping of SMD NTC thermistors
1.1 Cardboard tape for case size 0402 and 0603 (taping to IEC 60286-3)
Dimensions (mm)
A0× B
T
2
Case size
0402
(8-mm tape)
0.60 × 1.15 0.95 × 1.80 ±0.2
0
0.70 1.10
Case size
0603
(8-mm tape)
Tolerance
T 0.60 0.90 max.
D
0
P
0
P
2
P
1
1.50 1.50 ±0.10
4.00 4.00 ±0.10
2.00 2.00 ±0.05
2.00 4.00 ±0.10
W 8.00 8.00 ±0.30
E 1.75 1.75 ±0.10
F 3.50 3.50 ±0.05
G 0.75 0.75 min.
1) ≤0.2 mm over 10 sprocket holes.
Important notes at the end of this document.
Page 7 of 26Please read Cautions and warnings and
1)
Temperature measurement and compensation B57891S
Leaded NTC thermistors, lead spacing 2.5 mm S891
1.2 Blister tape for case size 0805 and 1206 (taping to IEC 60286-3)
Dimensions (mm)
A0× B
K
0
T
2
D
0
D
1
P
0
P
2
P
1
Case size
0805
(8-mm tape)
1.60 × 2.40 1.90 × 3.50 ±0.2
0
1.40 1.40 max.
2.5 2.5 max.
1.50 1.50 +0.10/–0
1.00 1.00 min.
4.00 4.00 ±0.10
2.00 2.00 ±0.05
4.00 4.00 ±0.10
Case size
1206
(8-mm tape)
Tolerance
W 8.00 8.00 ±0.30
E 1.75 1.75 ±0.10
F 3.50 3.50 ±0.05
G 0.75 0.75 min.
2) ≤0.2 mm over 10 sprocket holes.
Important notes at the end of this document.
Page 8 of 26Please read Cautions and warnings and
2)
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