NTC Thermistors, Accuracy Line
www.vishay.com For technical questions contact: nlr.europe@vishay.com Document Number: 29049
70 Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents
FEATURES
•Accuracy over a wide temperature range
•High stability over a long life
•Excellent price/performance ratio
•Old part number was 2322 640 3/4/6....
•Component in accordance to RoHS 2002/95/EC and
WEEE 2002/96/EC
APPLICATIONS
•Temperature sensing and control
These thermistors have a negative temperature coefficient.
The device consists of a chip with two tinned solid
copper-plated leads. It is grey lacquered and colour coded,
but not insulated.
PACKAGING
The thermistors are packed in bulk or tape on reel;
see code numbers and relevant packaging quantities.
QUICK REFERENCE DATA
PARAMETER VALUE
Resistance value at 25 °C3.3Ωto 470 kΩ
Tolerance on R25-value ±2%; ±3%; ±5%; ±10%
Tolerance on B25/85-value ±0.5% to ±3%
Maximum dissipation 500 mW
Dissipation factor δ
(for information only)
7mW/K
8.5 mW/K
(for 640..338 to 689)
Response time 1.2 s
Thermal time constant τ (for
information only)
15 s
Operating temperature range:
at zero dissipation; continuously −40 to +125 °C
at zero dissipation;
for short periods
≤150 °C
at maximum dissipation (500 mW) 0 to 55 °C
Climatic category 40/125/56
Mass ≈0.3 g
ELECTRICAL DATA AND ORDERING INFORMATION
R25
(Ω)B25/85-VALUE CATALOG NUMBER 2381 640 6....
COLOR CODE
(see dimensions
drawing and note 1)
R25 ±2% R25 ±3% R25 ±5% R25 ±10% I II III
3.3 2880 K ±3% 4338 6338 3338 2338 orange orange gold
4.7 2880 K ±3% 4478 6478 3478 2478 yellow violet gold
6.8 2880 K ±3% 4688 6688 3688 2688 blue grey gold
10 2990 K ±3% 4109 6109 3109 2109 brown black black
15 3041 K ±3% 4159 6159 3159 2159 brown green black
22 3136 K ±3% 4229 6229 3229 2229 red red black
33 3390 K ±3% 4339 6339 3339 2339 orange orange black
47 3390 K ±3% 4479 6479 3479 2479 yellow violet black
68 3390 K ±3% 4689 6689 3689 2689 blue grey black
100 3560 K ±0.75% 4101 6101 3101 2101 brown black brown
150 3560 K ±0.75% 4151 6151 3151 2151 brown green brown
220 3560 K ±0.75% 4221 6221 3221 2221 red red brown
330 3560 K ±0.75% 4331 6331 3331 2331 orange orange brown
470 3560 K ±0.5% 4471 6471 3471 2471 yellow violet brown
680 3560 K ±0.5% 4681 6681 3681 2681 blue grey brown
1000 3528 K ±0.5% 4102 6102 3102 2102 brown black red
1500 3528 K ±0.5% 4152 6152 3152 2152 brown green red
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DERATING AND TEMPERATURE TOLERANCES
05540 85 125
T ( C)
o
100
0
P
(%)
amb
Power derating curve.
DIMENSIONS in millimeters PHYSICAL DIMENSIONS FOR RELEVANT TYPE
MARKING
The thermistors are marked with coloured bands; see
dimensions drawing and “Electrical data and ordering
information”.
MOUNTING
By soldering in any position.
2381 640 6.338 to 6.474.
L
T
B
H2
H1
ΛΙ
ΙΙΙ
ΙΙ
Ι
d
P
CODE
NUMBER
2381 640
.....
Bmax d
H1
H2
max
LPT
max
MIN. MAX.
6.338 to
6.221
5.0 0.6
±0.06
1.0 4.0 6.0 24
±1.5
2.54 4.0
6.331 to
6.474
3.3
±0.5
0.6
±0.06
−2.0
±1.0
6.0 24
±1.5
2.54 3.0
Notes
1. Dependent upon R25-tolerance, the band IV is coloured as follows:
a) for R25 ±2%, band IV is coloured red
b) for R25 ±3%, band IV is coloured orange
c) for R25 ±5%, band IV is coloured gold
d) for R25 ±10%, band IV is coloured silver.
2000 3528 K ±0.5% 4202 6202 3202 2202 red black red
2200 3977 K ±0.75% 4222 6222 3222 2222 red red red
2700 3977 K ±0.75% 4272 6272 3272 2272 red violet red
3300 3977 K ±0.75% 4332 6332 3332 2332 orange orange red
4700 3977 K ±0.75% 4472 6472 3472 2472 yellow violet red
6800 3977 K ±0.75% 4682 6682 3682 2682 blue grey red
10000 3977 K ±0.75% 4103 6103 3103 2103 brown black orange
12000 3740 K ±2% 4123 6123 3123 2123 brown red orange
15000 3740 K ±2% 4153 6153 3153 2153 brown green orange
22000 3740 K ±2% 4223 6223 3223 2223 red red orange
33000 4090 K ±1.5% 4333 6333 3333 2333 orange orange orange
47000 4090 K ±1.5% 4473 6473 3473 2473 yellow violet orange
68000 4190 K ±1.5% 4683 6683 3683 2683 blue grey orange
100000 4190 K ±1.5% 4104 6104 3104 2104 brown black yellow
150000 4370 K ±2.5% 4154 6154 3154 2154 brown green yellow
220000 4370 K ±2.5% 4224 6224 3224 2224 red red yellow
330000 4570 K ±1.5% 4334 6334 3334 2334 orange orange yellow
470000 4570 K ±1.5% 4474 6474 3474 2474 yellow violet yellow
R25
(Ω)B25/85-VALUE CATALOG NUMBER 2381 640 6....
COLOR CODE
(see dimensions
drawing and note 1)
R25 ±2% R25 ±3% R25 ±5% R25 ±10% I II III
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72 Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
Curves valid for 68 to 100 kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
Curve 4: ∆R25/R25 =1%
(for 2381 640 5.... series only).
40 160
4.0
0
1.0
2.0
2.5
0.5
1.5
3.5
3.0
0 40 80 120
3
∆T
(K)
o
T ( C)
4
2
1
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
Curves valid for 2.2to10kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
Curve 4: ∆R25/R25 =1%
(for 2381 640 5.... series only).
40 160
3.0
0
1.0
2.0
2.5
0.5
1.5
0 40 80 120
1
2
4
3
∆T
(K)
o
T ( C)
Curves valid for 33 to 47 kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
Curve 4: ∆R25/R25 =1%
(for 2381 640 5.... series only).
40 160
4.0
0
1.0
2.0
2.5
0.5
1.5
3.5
3.0
0 40 80 120
1
2
3
∆T
(K)
o
T ( C)
4
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
40 160
0
2
4
5
1
3
0 40 80 120
1
2
3
∆T
(K)
o
T ( C)
Curves valid for 12 to 22 kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
40 160
6
0
2
4
5
1
3
0 40 80 120
3
∆T
(K)
o
T ( C)
2
1
Curves valid for 150 to 220 kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
40 160
4.0
0
1.0
2.0
2.5
0.5
1.5
3.5
3.0
0 40 80 120
1
3
∆T
(K)
o
T ( C)
2
Curves valid for 330 to 470 kΩ.
Curve 1: ∆R25/R25 =5%.
Curve 2: ∆R25/R25 =3%.
Curve 3: ∆R25/R25 =2%.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
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NTC Thermistors, Accuracy Line Vishay BCcomponents
RT VALUE AND TOLERANCE
These thermistors have a narrow tolerance on the B-value,
the result of which provides a very small tolerance on the
nominal resistance value over a wide temperature range. For
this reason the usual graphs of R = f(T) are replaced by
Resistance Values at Intermediate Temperatures Tables,
together with a formula to calculate the characteristics with a
high precision.
FORMULAE TO DETERMINE NOMINAL
RESISTANCE VALUES
The resistance values at intermediate temperatures, or the
operating temperature values, can be calculated using the
following interpolation laws
(extended “Steinhart and Hart”):
(1)
(2)
where:
A, B, C, D, A1, B1, C1 and D1 are constant values
depending on the material concerned; see table below.
Rref is the resistance value at a reference temperature (in
this event 25 °C).
T is the temperature in K.
Formulae numbered (1) and (2) are interchangeable with an
error of max. 0.005 °C in the range 25 °C to 125 °C and
max. 0.015 °C in the range −40 °Cto+25°C.
DETERMINATION OF THE
RESISTANCE/TEMPERATURE DEVIATION
FROM NOMINAL VALUE
The total resistance deviation is obtained by combining the
‘R25-tolerance’ and the ‘resistance deviation due to
B-tolerance’.
When:
X=R
25-tolerance
Y = resistance deviation due to B-tolerance
Z = complete resistance deviation,
then: or Z ≈X+Y.
When:
TC = temperature coefficient
∆T = temperature deviation,
then:
The temperature tolerances are plotted in the graphs on the
previous page.
Example: at 0 °C, assume X = 5%, Y = 0.89% and
TC = 5.08%/K (see Table ), then:
A NTC with a R25-value of 10 kΩ has a value of 32.56 kΩ
between −1.17 and +1.17 °C.
R
(T) R=ref e×ABT⁄CT
2
⁄DT
3
⁄+++(
)
T (R) = A1B1
R
Rref
----------ln C1ln2R
Rref
----------D1ln3R
Rref
----------
+++
⎝⎠
⎛⎞
1–
Z1
X
100
----------
+
⎝⎠
⎛⎞
1Y
100
----------
+
⎝⎠
⎛⎞
1–×= 100×%
∆TZ
TC
--------
=
Z1
5
100
----------
+ 1
0.89
100
-----------
+1–×
⎩⎭
⎨⎬
⎧⎫
100%×=
1.05 1.0089 1–×
{}
100% 5.9345% 5.93%≈
()
=×·
=
∆TZ
TC
--------5.93
5.08
----------- 1.167 °C 1.17≈ °C)(== =
Notes
1. Temperature < 25 °C.
2. Temperature ≥25 °C.
PARAMETERS FOR DETERMINING NOMINAL RESISTANCE VALUES
B25/85
(K) NAME
TO L . B
VALU
E %
AB
(K)
C
(105K2)
DA
1
(10−3)
B1
(10−4K−1)
C1
(10−6K−2)
D1
(10−7K−3)
1 2880
mat O. with Bn = 2880K
3
-9.094 2251.74 229098 -27448200 3.354016 3.495020 2.09596E-06 4.26062E-07
2 2990
mat P. with Bn = 3990K
3
-10.2296 2887.62 132336 -25025100 3.354016 3.415560 4.95546E-06 4.36424E-07
3 3041
mat Q. with Bn = 3041K
3
-11.1334 3658.73 -102895 516652 3.354016 3.349290 3.68384E-06 7.05046E-08
616652
4 3136
mat R. with Bn = 3136K
3
-12.4493 4702.74 -402687 3196830 3.354016 3.243880 2.65801E-06 -2.70156E-0
5 3390
mat S. with Bn = 3390K
3
-12.6814 4391.97 -232807 1509643 3.354016 2.993410 2.13513E-06 -8.05672E-0
63528
(1
mat I. with Bn = 3528K
0.5
-12.0596 3687.667 -7617.13 -5914730 3.354016 2.909670 1.63214E-06 7.1922E-08
3528
(2
-21.0704 11903.95 -2504699 247033800 3.354016 2.933910 3.49431E-06 -7.71269E-0
7 3560
mat H. with Bn = 3560K
0.75
-13.0723 4190.574 -47158.40 -11992560. 3.354016 2.884190 4.11803E-06 1.78679E-07
83740
mat B. with Bn = 3740K
2
-13.8973 4557.725 -98275 -7522357 3.354016 2.744030 3.66694E-06 1.37549E-07
93977
mat A. with Bn = 3977K
0.75
-14.6337 4791.842 -115334 -3730535 3.354016 2.569850 2.62013E-06 6.38309E-08
10 4090
mat C. with Bn = 4090K
1.5
-15.5322 5229.973 -160451 -5414091 3.354016 2.519110 3.51094E-06 1.10518E-07
11 4190
mat D. with Bn = 4190K
1.5
-16.0349 5459.339 -191141 -3328322 3.354016 2.460380 3.40538E-06 1.03424E-07
12 4370
mat E. with Bn = 4370K
2.5
-16.8717 5759.15 -194267 -6869149 3.354016 2.367720 3.58514E-06 1.25535E-07
13 4570
mat F. with Bn = 4570K
1.5
-17.6439 6022.726 -203157 -7183526 3.354016 2.264100 3.27818E-06 1.09763E-07
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74 Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.338 6.478 6.688
−40 13.6364 8.08 −4.97 45.00 64.09 92.73
−35 10.6806 7.30 −4.80 35.25 50.20 72.63
−30 8.4350 6.55 −4.64 27.84 39.64 57.36
−25 6.7148 5.84 −4.48 22.16 31.56 45.66
−20 5.3866 5.15 −4.33 17.78 25.32 36.63
−15 4.3532 4.49 −4.19 14.37 20.46 29.60
−10 3.5432 3.85 −4.05 11.69 16.65 24.09
−5 2.9035 3.24 −3.92 9.58 13.65 19.74
0 2.3950 2.65 −3.79 7.90 11.26 16.29
5 1.9880 2.08 −3.66 6.56 9.34 13.52
10 1.6602 1.54 −3.55 5.48 7.80 11.29
15 1.3944 1.01 −3.43 4.60 6.55 9.48
20 1.1777 0.49 −3.32 3.89 5.54 8.01
25 1.0000 0.00 −3.22 3.30 4.70 6.80
30 0.8534 0.48 −3.12 2.82 4.01 5.80
35 0.7319 0.94 −3.02 2.42 3.44 4.98
40 0.6307 1.39 −2.93 2.08 2.96 4.29
45 0.5459 1.82 −2.84 1.80 2.57 3.71
50 0.4746 2.24 −2.76 1.57 2.23 3.23
55 0.4143 2.65 −2.68 1.37 1.95 2.82
60 0.3631 3.04 −2.60 1.20 1.71 2.47
65 0.3194 3.43 −2.52 1.05 1.50 2.17
70 0.2820 3.80 −2.45 0.93 1.33 1.92
75 0.2499 4.16 −2.38 0.82 1.17 1.70
80 0.2222 4.51 −2.32 0.73 1.04 1.51
85 0.1982 4.85 −2.25 0.65 0.93 1.35
90 0.1774 5.19 −2.19 0.59 0.83 1.21
95 0.1592 5.51 −2.13 0.53 0.75 1.08
100 0.1433 5.82 −2.07 0.47 0.67 0.97
105 0.1294 6.13 −2.02 0.43 0.61 0.88
110 0.1171 6.43 −1.97 0.39 0.55 0.80
115 0.1063 6.72 −1.92 0.35 0.50 0.72
120 0.0967 7.00 −1.87 0.32 0.45 0.66
125 0.0882 7.28 −1.82 0.29 0.41 0.60
130 0.0806 7.55 −1.77 0.27 0.38 0.55
135 0.0739 7.81 −1.73 0.24 0.35 0.50
140 0.0678 8.07 −1.69 0.22 0.32 0.46
145 0.0624 8.32 −1.65 0.21 0.29 0.42
150 0.0575 8.56 −1.61 0.19 0.27 0.39
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.109
−40 13.675 8.39 −4.86 136.75
−35 10.763 7.58 −4.72 107.63
−30 8.5318 6.81 −4.58 85.32
−25 6.8097 6.06 −4.44 68.10
−20 5.4717 5.35 −4.31 54.72
−15 4.4253 4.66 −4.18 44.25
−10 3.6017 4.00 −4.06 36.02
−5 2.9494 3.37 −3.94 29.49
0 2.4295 2.75 −3.82 24.30
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NTC Thermistors, Accuracy Line Vishay BCcomponents
5 2.0128 2.16 −3.71 20.13
10 1.6767 1.59 −3.60 16.77
15 1.4042 1.04 −3.50 14.04
20 1.1821 0.51 −3.39 11.82
25 1.0000 0.00 −3.30 10.00
30 0.8500 0.50 −3.20 8.50
35 0.7259 0.98 −3.11 7.26
40 0.6226 1.44 −3.03 6.23
45 0.5363 1.89 −2.94 5.36
50 0.4639 2.33 −2.86 4.64
55 0.4029 2.75 −2.78 4.03
60 0.3512 3.16 −2.71 3.51
65 0.3073 3.56 −2.64 3.07
70 0.2698 3.95 −2.57 2.70
75 0.2377 4.32 −2.50 2.38
80 0.2101 4.69 −2.43 2.10
85 0.1864 5.04 −2.37 1.86
90 0.1658 5.38 −2.31 1.66
95 0.1479 5.72 −2.25 1.48
100 0.1323 6.05 −2.20 1.32
105 0.1187 6.36 −2.14 1.19
110 0.1068 6.67 −2.09 1.07
115 0.0964 6.98 −2.04 0.96
120 0.0871 7.27 −1.99 0.87
125 0.0790 7.56 −1.94 0.79
130 0.0717 7.84 −1.90 0.72
135 0.0653 8.11 −1.85 0.65
140 0.0596 8.37 −1.81 0.60
145 0.0545 8.63 −1.77 0.55
150 0.0500 8.89 −1.73 0.50
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.109
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.159
−40 17.042 8.53 −5.54 255.63
−35 12.993 7.71 −5.31 194.90
−30 10.017 6.92 −5.10 150.26
−25 7.8037 6.17 −4.90 117.06
−20 6.1382 5.44 −4.71 92.07
−15 4.8719 4.74 −4.53 73.08
−10 3.8996 4.07 −4.37 58.49
−5 3.1461 3.42 −4.22 47.19
0 2.5571 2.80 −4.07 38.36
5 2.0930 2.20 −3.94 31.40
10 1.7245 1.62 −3.81 25.87
15 1.4298 1.06 −3.69 21.45
20 1.1924 0.52 −3.57 17.89
25 1.0000 0.00 −3.47 15.00
30 0.8431 0.50 −3.36 12.65
35 0.7144 0.99 −3.26 10.72
40 0.6083 1.47 −3.17 9.12
45 0.5203 1.92 −3.08 7.80
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2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
50 0.4470 2.37 −3.00 6.70
55 0.3856 2.80 −2.92 5.78
60 0.3339 3.21 −2.84 5.01
65 0.2903 3.62 −2.76 4.35
70 0.2533 4.01 −2.69 3.80
75 0.2218 4.39 −2.62 3.33
80 0.1948 4.77 −2.56 2.92
85 0.1717 5.13 −2.50 2.58
90 0.1518 5.48 −2.44 2.28
95 0.1346 5.82 −2.38 2.02
100 0.1196 6.15 −2.32 1.79
105 0.1067 6.47 −2.27 1.60
110 0.0954 6.79 −2.22 1.43
115 0.0855 7.09 −2.17 1.28
120 0.0768 7.39 −2.12 1.15
125 0.0691 7.69 −2.07 1.04
130 0.0624 7.97 −2.03 0.94
135 0.0565 8.25 −1.98 0.85
140 0.0512 8.52 −1.94 0.77
145 0.0465 8.78 −1.90 0.70
150 0.0423 9.04 −.86 0.63
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.159
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.229
−40 17.042 8.80 −5.54 374.92
−35 12.993 7.95 −5.31 285.85
−30 10.017 7.14 −5.10 220.38
−25 7.8037 6.36 −4.90 171.68
−20 6.1382 5.61 −4.71 135.04
−15 4.8719 4.89 −4.53 107.18
−10 3.8996 4.20 −4.37 85.79
−5 3.1461 3.53 −4.22 69.21
0 2.5571 2.89 −4.07 56.26
5 2.0930 2.27 −3.94 46.05
10 1.7245 1.67 −3.81 37.94
15 1.4298 1.10 −3.69 31.45
20 1.1924 0.54 −3.57 26.23
25 1.0000 0.00 −3.47 22.00
30 0.8431 0.52 −3.36 18.55
35 0.7144 1.02 −3.26 15.72
40 0.6083 1.51 −3.17 13.38
45 0.5203 1.98 −3.08 11.45
50 0.4470 2.44 −3.00 9.83
55 0.3856 2.88 −2.92 8.48
60 0.3339 3.32 −2.84 7.35
65 0.2903 3.73 −2.76 6.39
70 0.2533 4.14 −2.69 5.57
75 0.2218 4.53 −2.62 4.88
80 0.1948 4.91 −2.56 4.29
85 0.1717 5.29 −2.50 3.78
90 0.1518 5.65 −2.44 3.34
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Revision: 12-Apr-05 77
2381 640 3/4/6....
NTC Thermistors, Accuracy Line Vishay BCcomponents
95 0.1346 6.00 −2.38 2.96
100 0.1196 6.34 −2.32 2.63
105 0.1067 6.68 −2.27 2.35
110 0.0954 7.00 −2.22 2.10
115 0.0855 7.32 −2.17 1.88
120 0.0768 7.62 −2.12 1.69
125 0.0691 7.93 −2.07 1.52
130 0.0624 8.22 −2.03 1.37
135 0.0565 8.50 −1.98 1.24
140 0.0512 8.78 −1.94 1.13
145 0.0165 9.06 −1.90 1.02
150 0.0423 9.32 −1.86 0.93
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.229
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.339 6.479 6.689
−40 21.4241 9.51 −5.94 707.00 1006.93 1456.84
−35 16.0147 8.59 −5.70 528.48 752.69 1089.00
−30 12.1074 7.72 −5.49 399.54 569.05 823.30
−25 9.2511 6.87 −5.28 305.29 434.80 629.07
−20 7.1395 6.06 −5.09 235.60 335.56 485.49
−15 5.5619 5.29 −4.90 183.54 261.41 378.21
−10 4.3715 4.54 −4.73 144.26 205.46 297.26
−5 3.4647 3.82 −4.57 114.33 162.84 235.60
0 2.7678 3.12 −4.42 91.34 130.09 188.21
5 2.2276 2.45 −4.27 73.51 104.70 151.48
10 1.8057 1.81 −4.13 59.59 84.87 122.79
15 1.4735 1.18 −4.00 48.63 69.26 100.20
20 1.2102 0.58 −3.88 39.94 56.88 82.29
25 1.0000 0.00 −3.76 33.00 47.00 68.00
30 0.8311 0.56 −3.64 27.43 39.06 56.51
35 0.6946 1.11 −3.54 22.92 32.64 47.23
40 0.5835 1.63 −3.43 19.26 27.42 39.68
45 0.4927 2.14 −3.34 16.26 23.16 33.50
50 0.4180 2.64 −3.24 13.79 19.65 28.42
55 0.3563 3.12 −3.15 11.76 16.74 24.23
60 0.3050 3.58 −3.07 10.06 14.33 20.74
65 0.2622 4.03 −2.98 8.65 12.32 17.83
70 .02263 4.47 −2.90 7.47 10.64 15.39
75 0.1961 4.90 −2.83 6.47 9.22 13.33
80 0.1705 5.31 −2.76 5.63 8.02 11.60
85 0.1489 5.71 −2.69 4.91 7.00 10.12
90 0.1304 6.11 −2.62 4.30 6.13 8.86
95 0.1146 6.49 −2.55 3.78 5.38 7.79
100 0.1010 6.86 −2.49 3.33 4.75 6.87
105 0.0893 7.22 −2.43 2.95 4.20 6.07
110 0.0792 7.57 −2.37 2.61 3.72 5.38
115 0.0704 7.91 −2.32 2.32 3.31 4.79
120 0.0628 8.24 −2.26 2.07 2.95 4.27
125 0.0561 8.57 −2.21 1.85 2.64 3.82
130 0.0503 8.88 −2.16 1.66 2.37 3.42
135 0.0452 9.19 −2.11 1.49 2.13 3.07
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78 Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
140 0.0407 9.49 −2.07 1.34 1.91 2.77
145 0.0368 9.79 −2.02 1.21 1.73 2.50
150 0.0333 10.08 −1.98 1.10 1.56 2.26
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.339 6.479 6.689
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.101 6.151 6.221 6.331 6.471 6.681
−40 21.9261 2.50 −5.75 2192.6 2388.9 4823.7 7236 10503 14910
−35 16.5224 2.26 −5.57 1652.2 2478.4 3634.9 5452 7766 11235
−30 12.5583 2.03 −5.40 1255.8 1883.7 2762.8 4144 5902 8540
−25 9.62492 1.80 −5.24 962.5 1443.7 2117.5 3176 4524 6545
−20 7.43618 1.59 −5.08 743.6 1115.4 1636.0 2454 3495 5057
−15 5.78976 1.39 −4.93 579.0 868.5 1273.7 1911 2721 3937
−10 4.54158 1.19 −4.78 454.2 681.2 999.1 1499 1235 3088
−5 3.58813 1.00 −4.64 358.8 538.2 789.4 1184 1686 2440
0 2.85449 0.82 −4.51 285.4 428.2 628.0 942.0 1342 1941
5 2.28599 0.64 −4.38 228.6 342.9 502.9 754.4 1074 1554
10 1.84245 0.47 −4.25 184.2 276.4 405.3 608.0 865.9 1253
15 1.49414 0.31 −4.13 149.4 224.1 328.7 493.1 702.2 1016
20 1.21887 0.15 −4.01 121.9 182.8 268.2 402.2 572.9 828.8
25 1.000 0.00 −3.90 100.0 150.0 220.0 330.0 470.0 680.0
30 0.82494 0.15 −3.80 82.5 123.7 181.5 272.2 387.7 561.0
35 0.68413 0.29 −3.69 68.4 102.6 150.5 225.8 321.5 465.2
40 0.57025 0.43 −3.59 57.0 85.5 125.5 188.2 268.0 387.8
45 0.47765 0.56 −3.50 47.8 71.6 105.1 157.6 224.5 324.8
50 0.40198 0.69 −3.40 40.2 60.3 88.4 132.7 188.9 273.3
55 0.33984 0.82 −3.31 34.0 51.0 74.8 112.1 159.7 231.1
60 0.28856 0.94 −3.23 28.9 43.3 63.5 95.23 135.6 196.2
65 0.24606 1.06 −3.15 24.6 36.9 54.1 81.20 115.6 167.3
70 0.21067 1.17 −3.07 21.1 31.6 46.3 69.52 99.00 143.3
75 0.18108 1.29 −2.99 18.1 27.2 39.8 59.76 85.11 123.1
80 0.15623 1.39 −2.91 15.6 23.4 34.4 51.56 73.43 106.2
85 0.13529 1.50 −2.84 13.5 20.3 29.8 44.65 63.59 92.00
90 0.11757 1.60 −2.77 11.8 17.6 25.9 38.80 55.26 79.95
95 0.10251 1.70 −2.71 10.3 15.4 22.6 33.83 48.18 69.71
100 0.08968 1.80 −2.64 8.97 13.5 19.7 29.59 42.15 60.98
105 0.07871 1.89 −2.58 7.87 11.8 17.3 25.97 36.99 53.52
110 0.06928 1.99 −2.52 6.93 10.4 15.2 22.86 32.56 47.11
115 0.06117 2.08 −2.46 6.12 9.18 13.5 20.19 28.75 41.60
120 0.05416 2.16 −2.41 5.42 8.12 11.9 17.87 25.46 36.83
125 0.04809 2.25 −2.35 4.81 7.21 10.6 15.87 22.60 32.70
130 0.04282 2.33 −2.30 4.28 6.42 9.42 14.13 20.12 29.11
135 0.03822 2.41 −2.25 3.82 5.73 8.41 12.61 17.96 25.99
140 0.03420 2.49 −2.20 3.42 5.13 7.52 11.29 16.07 23.25
145 0.03068 2.57 −2.15 3.07 4.60 6.75 10.12 14.42 20.86
150 0.02758 2.65 −2.10 2.76 4.14 6.07 9.10 12.96 18.76
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Revision: 12-Apr-05 79
2381 640 3/4/6....
NTC Thermistors, Accuracy Line Vishay BCcomponents
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(Ω)
2381 640 .....; see note 1 at end of tables
6.102 6.152 6.202
−40 23.3402 1.65 −6.06 23342 35013 46684
−35 17.3347 1.49 −5.84 17336 26004 34672
−30 13.0166 1.34 −5.62 13018 19526 26035
−25 9.8764 1.19 −5.42 9877 14816 19754
−20 7.5682 1.05 −5.23 7569 11353 15138
−15 5.8541 0.92 −5.05 5855 8782 11709
−10 4.5688 0.79 −4.87 4569 6854 9138
−5 3.5961 0.66 −4.71 3596 5395 7193
0 2.8533 0.54 −4.55 2854 4280 5707
5 2.2815 0.43 −4.40 2282 3422 4563
10 1.8376 0.31 −4.26 1838 2457 3675
15 1.4904 0.21 −4.12 1491 2236 2981
20 1.2169 0.10 −3.99 1217 1826 2434
25 1.0000 0.00 −3.87 1000 1500 2000
30 0.8266 0.10 −3.75 826.7 1240 1653
35 0.6873 0.19 −3.63 687.4 1031 1375
40 0.5746 0.28 −3.53 574.6 861.9 1149
45 0.4827 0.37 −3.42 482.7 724.1 965.0
50 0.4073 0.46 −3.32 407.4 611.0 814.7
55 0.3452 0.54 −3.23 345.2 517.8 690.5
60 0.2937 0.62 −3.14 293.7 440.6 587.5
65 0.2508 0.70 −3.05 250.8 376.2 501.7
70 0.2149 0.78 −2.97 214.9 322.4 429.8
75 0.1847 0.85 −2.89 184.8 277.1 369.5
80 0.1593 0.92 −2.81 159.3 238.9 318.6
85 0.1377 0.99 −2.73 137.7 206.6 275.5
90 0.11942 1.06 −2.66 119.4 179.1 238.9
95 0.10380 1.13 −2.59 103.8 155.7 207.6
100 0.09045 1.19 −2.53 90.46 135.7 180.9
105 0.07900 1.25 −2.46 79.00 118.5 158.0
110 0.06915 1.31 −2.40 69.16 103.7 138.3
115 0.06066 1.37 −2.34 60.66 90.99 121.3
120 0.05332 1.43 −2.29 53.32 79.98 106.6
125 0.04696 1.49 −2.23 46.96 70.44 93.9
130 0.04143 1.54 −2.18 41.44 62.15 82.9
135 0.03662 1.60 −2.13 36.63 54.94 73.3
140 0.03243 1.65 −2.08 32.43 48.65 64.9
145 0.02877 1.70 −2.03 28.77 43.16 57.5
150 0.02556 1.75 −1.98 25.56 38.34 51.1
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.222 6.272 6.332 6.472 6.682 6.103
−40 33.21 2.66 6.57 73.06 89.67 109.6 156.1 225.8 332.1
−35 23.99 2.41 6.36 52.78 64.77 79.17 112.8 163.1 240.0
−30 17.52 2.17 6.15 38.55 47.31 57.82 82.35 119.1 175.2
−25 12.93 1.94 5.95 28.44 34.91 42.67 60.77 87.92 129.3
−20 9.636 1.71 5.76 21.20 26.02 31.80 45.30 65.53 96.36
−15 7.250 1.50 5.58 15.95 19.58 23.93 34.08 49.30 72.50
−10 5.505 1.29 5.40 12.11 14.86 18.16 25.87 37.43 55.05
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2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
−5 4.216 1.08 5.24 9.275 11.38 13.91 19.81 28.67 42.16
0 3.255 0.89 5.08 7.162 8.790 10.74 15.30 22.14 32.56
5 2.534 0.70 4.92 5.575 6.842 8.362 11.91 17.23 25.34
10 1.987 0.52 4.78 4.372 5.366 6.558 9.340 13.51 19.87
15 1.570 0.34 4.64 3.454 4.239 5.181 7.378 10.67 15.70
20 1.249 0.17 4.50 2.747 3.372 4.121 5.869 8.492 12.49
25 1.000 0.00 4.37 2.200 2.700 3.300 4.700 6.800 10.00
30 0.8059 0.16 4.25 1.773 2.176 2.660 3.788 5.480 8.059
35 0.6535 0.32 4.13 1.438 1.764 2.156 3.072 4.444 6.535
40 0.5330 0.47 4.02 1.173 1.439 1.759 2.505 3.624 5.330
45 0.4372 0.62 3.91 0.9618 1.180 1.443 2.055 2.972 4.372
50 0.3605 0.77 3.80 0.7932 0.973 1.190 1.694 2.451 3.606
55 0.2989 0.91 3.70 0.6575 0.807 0.9863 1.405 2.032 2.989
60 0.2490 1.05 3.60 0.5478 0.672 0.8217 1.170 1.693 2.490
65 0.2084 1.18 3.51 0.4586 0.562 0.6879 0.9797 1.417 2.084
70 0.1753 1.31 3.42 0.3857 0.473 0.5785 0.8239 1.192 1.753
75 0.1481 1.44 3.33 0.3258 0.399 0.4887 0.6960 1.007 1.481
80 0.1256 1.57 3.25 0.2764 0.339 0.4146 0.5905 0.8544 1.256
85 0.1070 1.69 3.16 0.2355 0.289 0.3532 0.5031 0.7278 1.070
90 0.09154 1.81 3.09 0.2014 0.247 0.3021 0.4303 0.6225 0.9154
95 0.07860 1.93 3.01 0.1729 0.212 0.2594 0.3694 0.5345 0.7860
100 0.06773 2.04 2.94 0.1490 0.182 0.2235 0.3183 0.4607 0.6773
105 0.05858 2.15 2.87 0.1289 0.158 0.1933 0.2753 0.3983 0.5858
110 0.05083 2.26 2.80 0.1118 0.137 0.1677 0.2389 0.3457 0.5083
115 0.04426 2.37 2.73 0.0974 0.1195 0.1461 0.2080 0.3010 0.4426
120 0.03866 2.47 2.67 0.0851 0.1044 0.1276 0.1817 0.2629 0.3866
125 0.03387 2.57 2.61 0.0745 0.0915 0.1118 0.1592 0.2303 0.3387
130 0.02977 2.67 2.55 0.0655 0.0804 0.0982 0.1399 0.2024 0.2977
135 0.02624 2.77 2.49 0.0577 0.0709 0.0866 0.1233 0.1784 0.2624
140 0.02319 2.86 2.43 0.0510 0.0626 0.0765 0.1090 0.1577 0.2319
145 0.02055 2.96 2.38 0.0452 0.0555 0.0678 0.0966 0.1398 0.2055
150 0.01826 3.05 2.33 0.0402 0.0493 0.0603 0.0858 0.1242 0.1826
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.222 6.272 6.332 6.472 6.682 6.103
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.123 6.153 6.223
−40 25.78 6.81 6.09 309.4 386.8 567.2
−35 19.13 6.16 5.89 229.5 286.9 420.8
−30 14.32 5.53 5.70 171.8 214.8 315.0
−25 10.82 4.93 5.52 129.8 162.3 238.0
−20 8.245 4.35 5.35 98.93 123.7 181.4
−15 6.335 3.80 5.19 76.02 95.03 139.4
−10 4.907 3.26 5.03 58.88 73.60 107.9
−5 3.830 2.74 4.88 45.95 57.44 84.25
0 3.011 2.24 4.73 36.13 45.16 66.24
5 2.384 1.76 4.60 28.60 35.76 52.45
10 1.900 1.30 4.46 22.80 28.50 41.81
15 1.525 0.85 4.34 18.30 22.87 33.55
20 1.231 0.42 4.21 14.77 18.47 27.09
25 1.000 0.00 4.10 12.00 15.00 22.00
30 0.8170 0.41 3.98 9.804 12.26 17.97
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2381 640 3/4/6....
NTC Thermistors, Accuracy Line Vishay BCcomponents
35 0.6712 0.80 3.88 8.054 10.07 14.77
40 0.5543 1.19 3.77 6.652 8.315 12.20
45 0.4602 1.57 3.67 5.522 6.903 10.12
50 0.3839 1.94 3.57 4.607 5.759 8.447
55 0.3219 2.30 3.48 3.862 4.828 7.081
60 0.2710 2.65 3.39 3.252 4.067 5.963
65 0.2293 2.99 3.30 2.751 3.439 5.044
70 0.1947 3.33 3.22 2.337 2.921 4.284
75 0.1661 3.66 3.14 1.993 2.492 3.654
80 0.1422 3.98 3.06 1.707 2.134 3.129
85 0.1223 4.29 2.99 1.467 1.834 2.690
90 0.1055 4.60 2.92 1.266 1.583 2.321
95 0.09135 4.90 2.85 1.096 1.370 2.010
100 0.07937 5.19 2.78 0.9524 1.190 1.746
105 0.06919 5.48 2.71 0.8302 1.038 1.522
110 0.06050 5.76 2.65 0.7260 0.9075 1.331
115 0.05307 6.04 2.59 0.6369 0.7961 1.168
120 0.04670 6.31 2.53 0.5604 0.7005 1.027
125 0.04121 6.57 2.47 0.4945 0.6181 0.9065
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.123 6.153 6.223
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.333 6.473
−40 33.81 5.55 6.55 1116 1589
−35 24.50 5.02 6.34 808.6 1151
−30 17.93 4.52 6.15 591.7 842.8
−25 13.25 4.03 5.96 437.1 622.6
−20 9.875 3.56 5.78 325.9 464.1
−15 7.425 3.10 5.61 245.0 349.0
−10 5.630 2.67 5.45 185.8 264.6
−5 4.304 2.24 5.29 142.0 202.3
0 3.315 1.84 5.14 109.4 155.8
5 2.573 1.44 4.99 84.91 120.9
10 2.011 1.07 4.85 66.37 94.53
15 1.583 0.70 4.72 52.24 74.40
20 1.254 0.34 4.59 41.39 58.95
25 1.000 0.00 4.46 33.00 47.00
30 0.8024 0.33 4.34 26.47 37.71
35 0.6474 0.66 4.23 21.37 30.43
40 0.5255 0.98 4.12 17.34 24.70
45 0.4288 1.28 4.01 14.15 20.15
50 0.3518 1.59 3.91 11.61 16.53
55 0.2901 1.88 3.81 9.572 13.63
60 0.2403 2.17 3.71 7.931 11.30
65 0.2001 2.45 3.62 6.603 9.404
70 0.1674 2.72 3.53 5.522 7.865
75 0.1406 2.99 3.44 4.639 6.607
80 0.1186 3.25 3.36 3.913 5.573
85 0.1004 3.51 3.28 3.315 4.721
90 0.08542 3.76 3.20 2.819 4.015
95 0.07292 4.00 3.13 2.406 3.427
100 0.06248 4.24 3.06 2.062 2.936
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82 Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
105 0.05372 4.47 2.98 1.773 2.525
110 0.04635 4.70 2.92 1.530 2.179
115 0.04013 4.93 2.85 1.342 1.886
120 0.03485 5.15 2.79 1.150 1.638
125 0.03037 5.36 2.73 1.002 1.427
130 0.02654 5.57 2.67 0.8757 1.247
135 0.02326 5.78 2.61 0.7675 1.093
140 0.02044 5.98 2.55 0.6746 0.9608
145 0.01802 6.18 2.50 0.5945 0.8468
150 0.01592 6.37 2.44 0.5254 0.7483
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.333 6.473
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.683 6.104
−40 36.66 5.69 6.70 2493 3666
−35 26.38 5.15 6.49 1794 2638
−30 19.17 4.63 6.29 1303 1917
−25 14.06 4.13 6.10 956.2 1406
−20 10.41 3.65 5.92 708.0 1041
−15 7.779 3.18 5.74 528.9 777.9
−10 5.861 2.73 5.57 398.5 586.1
−5 4.453 2.30 5.41 302.8 445.3
0 3.409 1.88 5.26 231.8 340.9
5 2.631 1.48 5.11 178.9 263.1
10 2.044 1.09 4.97 139.0 204.4
15 1.600 0.72 4.83 108.8 160.0
20 1.261 0.35 4.70 85.74 126.1
25 1.000 0.00 4.57 68.00 100.0
30 0.7981 0.34 4.45 54.27 79.81
35 0.6408 0.67 4.35 43.57 64.08
40 0.5175 1.00 4.22 35.19 51.74
45 0.4202 1.32 4.11 28.57 42.02
50 0.3431 1.63 4.00 23.33 34.31
55 0.2816 1.93 3.90 19.15 28.16
60 0.2322 2.22 3.80 15.79 23.22
65 0.1925 2.51 3.71 13.09 19.25
70 0.1602 2.79 3.62 10.90 16.03
75 0.1340 3.06 3.53 9.114 13.40
80 0.1126 3.33 3.45 7.655 11.26
85 0.09496 3.59 3.36 6.457 9.496
90 0.08042 3.85 3.28 5.469 8.042
95 0.06837 4.10 3.21 4.649 6.837
100 0.05835 4.35 3.13 3.968 5.835
105 0.04998 4.59 3.06 3.399 4.998
110 0.04296 4.82 2.99 2.921 4.296
115 0.03705 5.05 2.92 2.519 3.705
120 0.03206 5.28 2.86 2.180 3.206
125 0.02783 5.50 2.80 1.892 2.783
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RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.154 6.224
−40 41.02 10.10 6.89 6153 9024
−35 29.29 9.12 6.68 4394 6444
−30 21.12 8.18 6.48 3168 4646
−25 15.37 7.28 6.29 2305 3381
−20 11.28 6.42 6.11 1693 2483
−15 8.358 5.59 5.93 1254 1839
−10 6.242 4.80 5.76 936.4 1373
−5 4.700 4.03 5.60 705.0 1034
0 3.567 3.30 5.44 535.0 784.7
5 2.727 2.59 5.29 409.1 600.0
10 2.101 1.90 5.15 315.1 462.1
15 1.629 1.25 5.01 244.4 358.4
20 1.272 0.61 4.88 190.8 279.9
25 1.000 0.00 4.75 150.0 220.0
30 0.7910 0.59 4.62 118.6 174.0
35 0.6295 1.18 4.51 94.42 138.5
40 0.5039 1.74 4.39 75.58 110.9
45 0.4056 2.30 4.28 60.85 89.24
50 0.3283 2.84 4.17 49.25 72.24
55 0.2672 3.37 4.07 40.08 58.78
60 0.2185 3.89 3.97 32.78 48.08
65 0.1796 4.40 3.87 26.94 39.51
70 0.1483 4.90 3.78 22.25 32.63
75 0.1231 5.39 3.69 18.46 27.07
80 0.1025 5.86 3.60 15.38 22.56
85 0.08582 6.33 3.52 12.87 18.88
90 0.07213 6.79 3.44 10.82 15.87
95 0.06086 7.24 3.36 9.129 13.39
100 0.05155 7.68 3.28 7.732 11.34
105 0.04383 8.11 3.21 6.574 9.642
110 0.03740 8.53 3.14 5.610 8.228
115 0.03203 8.94 3.07 4.804 7.046
120 0.02752 9.35 3.00 4.128 6.054
125 0.02372 9.75 2.94 3.559 5.219
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.334 6.474
−40 48.62 6.22 7.13 16044 22850
−35 34.19 5.63 6.91 11282 16068
−30 24.28 5.06 6.71 8013 11 413
−25 17.42 4.51 6.52 5747 8185
−20 12.61 3.98 6.33 4161 5926
−15 9.211 3.47 6.15 3040 4329
−10 6.788 2.98 5.98 2240 3190
−5 5.045 2.51 5.82 1665 2371
0 3.781 2.06 5.66 1248 1776
5 2.855 1.62 5.50 942.3 1342
10 2.173 1.19 5.36 717.1 1021
15 1.666 0.78 5.22 549.8 783.0
20 1.286 0.38 5.08 424.5 604.6
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25 1.000 0.00 4.95 330.0 470.0
30 0.7825 0.37 4.82 258.2 367.8
35 0.6163 0.74 4.70 203.4 289.6
40 0.4883 1.09 4.59 161.1 229.5
45 0.3892 1.44 4.47 128.4 182.9
50 0.3120 1.77 4.36 103.0 146.7
55 0.2515 2.10 4.26 83.00 118.2
60 0.2038 2.43 4.15 67.26 95.80
65 0.1660 2.74 4.06 54.79 78.03
70 0.1359 3.05 3.96 44.86 63.88
75 0.1118 3.35 3.87 36.90 52.55
80 0.09240 3.64 3.78 30.49 43.43
85 0.07670 3.93 3.69 25.31 36.05
90 0.06395 4.21 3.61 21.10 30.06
95 0.05354 4.48 3.53 17.67 25.16
100 0.04501 4.75 3.45 14.85 21.15
105 0.03798 5.01 3.37 12.53 17.85
110 0.03218 5.27 3.30 10.70 15.12
115 0.02736 5.52 3.23 9.029 12.86
120 0.02335 5.77 3.16 7.704 10.97
125 0.01999 6.01 3.09 6.597 9.396
Toper
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.334 6.474
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES WITH R25 AT 68 KΩAND 100 KΩ
Tamb
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.683 6.104
−40 36.66 5.69 6.70 2493 3666
−35 26.38 5.15 6.49 1794 2638
−30 19.17 4.63 6.29 1303 1917
−25 14.06 4.13 6.10 956.2 1406
−20 10.41 3.65 5.92 708.0 1041
−15 7.779 3.18 5.74 528.9 777.9
−10 5.861 2.73 5.57 398.5 586.1
−5 4.453 2.30 5.41 302.8 445.3
0 3.409 1.88 5.26 231.8 340.9
5 2.631 1.48 5.11 178.9 263.1
10 2.044 1.09 4.97 139.0 204.4
15 1.600 0.72 4.83 108.8 160.0
20 1.261 0.35 4.70 85.74 126.1
25 1.000 0.00 4.57 68.00 100.0
30 0.7981 0.34 4.45 54.27 79.81
35 0.6408 0.67 4.35 43.57 64.08
40 0.5175 1.00 4.22 35.19 51.74
45 0.4202 1.32 4.11 28.57 42.02
50 0.3431 1.63 4.00 23.33 34.31
55 0.2816 1.93 3.90 19.15 28.16
60 0.2322 2.22 3.80 15.79 23.22
65 0.1925 2.51 3.71 13.09 19.25
70 0.1602 2.79 3.62 10.90 16.03
75 0.1340 3.06 3.53 9.114 13.40
80 0.1126 3.33 3.45 7.655 11.26
85 0.09496 3.59 3.36 6.457 9.496
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90 0.08042 3.85 3.28 5.469 8.042
95 0.06837 4.10 3.21 4.649 6.837
100 0.05835 4.35 3.13 3.968 5.835
105 0.04998 4.59 3.06 3.399 4.998
110 0.04296 4.82 2.99 2.921 4.296
115 0.03705 5.05 2.92 2.519 3.705
120 0.03206 5.28 2.86 2.180 3.206
125 0.02783 5.50 2.80 1.892 2.783
Tamb
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
6.683 6.104
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES WITH R25 AT 470 KΩ
Note to Resistance Values At Intermediate Temperature Tables
1. Replace dot in last 5 digits of catalog number by a number according to the following details and depending on tolerance on
required R25-value: 4 for a tolerance of ±2%; 6 for a tolerance of ±3%; 3 for a tolerance of ±5%; 2 for a tolerance of ±10%.
Tamb
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2381 640 .....; see note 1 at end of tables
5.474
−40 48.62 6.22 7.13 22850
−35 34.19 5.63 6.91 16068
−30 24.28 5.06 6.71 11413
−25 17.42 4.51 6.52 8185
−20 12.61 3.98 6.33 5926
−15 9.211 3.47 6.15 4329
−10 6.788 2.98 5.98 3190
−5 5.045 2.51 5.82 2371
0 3.781 2.06 5.66 1776
5 2.855 1.62 5.50 1342
10 2.173 1.19 5.36 1021
15 1.666 0.78 5.22 783.0
20 1.286 0.38 5.08 604.6
25 1.000 0.00 4.95 470.0
30 0.7825 0.37 4.82 367.8
35 0.6163 0.74 4.70 289.6
40 0.4883 1.09 4.59 229.5
45 0.3892 1.44 4.47 182.9
50 0.3120 1.77 4.36 146.7
55 0.2515 2.10 4.26 118.2
60 0.2038 2.43 4.15 95.80
65 0.1660 2.74 4.06 78.03
70 0.1359 3.05 3.96 63.88
75 0.1118 3.35 3.87 52.55
80 0.09240 3.64 3.78 43.43
85 0.07670 3.93 3.69 36.05
90 0.06395 4.21 3.61 30.06
95 0.05354 4.48 3.53 25.16
100 0.04501 4.75 3.45 21.15
105 0.03798 5.01 3.37 17.85
110 0.03218 5.27 3.30 15.12
115 0.02736 5.52 3.23 12.86
120 0.02335 5.77 3.16 10.97
125 0.01999 6.01 3.09 9.396
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2381 640 3/4/6....
Vishay BCcomponents NTC Thermistors, Accuracy Line
PACKAGING
TAPE SPECIFICATIONS
DIMENSIONS OF TAPE IN ACCORDANCE WITH “IEC 60286-2”
Note
1. Taped products with H= 45±1, are available on request.
2. D ≤5 max for 6404.338 to 221.
SYMBOL PARAMETER
DIMENSIONS
(mm)
VALUE TOLERANCE
D body diameter(2) 3.3 +0.5
T maximum total thickness ≤3−
d lead diameter 0.6 ±0.06
P pitch between thermistors 12.7 ±1
P0feed-hole pitch (cumulative pitch error ±0.2 mm/20 products) 12.7 ±0.3
P1feed-hole centre to lead centre 5.08 ±0.7
∆p component alignment 0 ±1.3
F lead-to-lead distance 2.54 ±0.3
∆h component alignment 0 ±2
W tape width 18.0 +1/-0.5
W0hold-down tape width ≥12.5 −
W1feed-hole position 9.0 ±0.5
W2hold-down tape position ≤3−
H component to tape centre 22(1) ±1
H1component height ≤32 −
L length of snipped lead ≤11 −
D0feed-hole diameter 4.0 ±0.2
t total tape thickness with cardboard tape 0.5 ±0.1 mm 0.65 ±0.2
inspection level: S3 mechanical −1%
1E pitch
2322 640 4....
D
W2
P0
W0
W1L
HH1
∆ p ∆ p ∆ h ∆ h
FD0
P1
P
O d
W
T
A
t
detail A
direction of unreeling
MSA208
Thermistors on tape.
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DIMENSIONS OF TAPE IN ACCORDANCE WITH “IEC 60286-2”
Note
1. D ≤5 max for 640 3. 338 to 640 4. 221.
2. T ≤4 max for 640 3. 338 to 640 4. 221.
SYMBOL PARAMETER
DIMENSIONS
(mm)
VALUE TOLERANCE
D body diameter(1) 3.3 +0.5
T maximum total thickness(2) ≤3.2 −
d lead diameter 0.6 ±0.06
P pitch between thermistors 12.7 ±1
P0feed-hole pitch (cumulative pitch error ±0.2 mm/20 products) 12.7 ±0.3
P1feed-hole centre to lead centre 3.85 ±0.7
∆p component alignment 0 ±1.3
F lead-to-lead distance 5.08 ±0.3
∆h component alignment 0 ±2
W tape width 18.0 +1/-0.5
W0hold-down tape width ≥12.5 −
W1feed-hole position 9.0 +0.75/-0.5
W2hold-down tape position ≤3−
H component to tape centre 20 +2
H0lead wire clinch height 16 ±0.5
L length of snipped lead ≤11 −
D0feed-hole diameter 4.0 ±0.3
t total tape thickness with cardboard tape 0.5 ±0.1 mm 0.7 ±0.2
inspection level: S3 mechanical −1%
Thermistors on tape.
W2
W0
W1
D0
P0P1
O d
WA
direction of unreeling
10
max
D
P
L
H
H0
F
t
detail A
MSA209
T
∆ p ∆ p ∆ h ∆ h
2E pitch
2322 640 3....
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REEL SPECIFICATIONS
JW113
22.5
30 +1
−077 85.6 92 356
max.
18
3
42 ±1
56 max
Dimensions of the reel.
CODE NUMBERS AND RELEVANT PACKAGING QUANTITIES
Note
1. The maximum number of empty places per reel shall not exceed 0.1% of the total number of
components per reel. With no consecutive positions empty.
CHARACTERISTICS OF TAPED PRODUCTS
Minimum pull-out force of the component: 5 N.
Minimum peel-off force of adhesive tape: 6N.
Minimum tearing force tape: 15 N.
Minimum pull-off force of tape-reel: 5 N.
STORAGE CONDITIONS
Storage temperature range: −25 to +40 °C.
Maximum relative humidity: 80%.
PARAMETER
BULK TAPE AND REEL(1)
1e pitch
TAPE AND REEL(1)
2e pitch
2381 640 6.... 2381 640 4.... 2381 640 3....
Quantity 500 1500 per reel, 2 reels per
box
1500 per reel, 2 reels per
box
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with “IEC publication 60068-2; Environmental testing”, except where indicated.
STABILITY TESTS
Notes
1. For R25 ≥100 kΩ the drift requirement is ∆R/R <5%.
2. For R25 from 2.2 kΩ to 10 kΩ, requirement is ±2% max.
CECC 32 100
CLAUSE
IEC
60068-2
TEST METHOD
TEST PROCEDURE REQUIREMENTS
D3; 4.20.1 endurance 25 °C; 1000 hours ∆R/R <1%
1 endurance −40 °C; 1000 hours ∆R/R <1%
539 endurance 500 mW; 55 °C; 1000 hours ∆R/R <3% (note 1)
2 dry heat, 125 °C; 1000 hours ∆R/R <3%
D1; 4.19 3 damp heat 56 days at 40 °C; 90 to 95% RH ∆R/R <3%
C2; 4.14 14 rapid change of temperature −40 °C to +125 °C; 50 cycles ∆R/R <2%
Other applicable tests
21 robustness of leads: ∆R/R ≤1%
tensile strength loading force 10 N
bending loading force 5 N
58 soldering: ∆R/R ≤1% (note 2)
solderability 240 °C max.; duration 4 s max.
resistance to heat 265 °C max.; duration 5 s max.
27 impact free fall; 1 m ∆R/R ≤1%
29 shock 490 m/s; half sinewave ∆R/R ≤1%
45 resistance to solvent ambient temp for 5 min; no traces of lacquer on
6 vibration 1.5 mm peak to peak: 10 to 58 Hz no visible damage
2 inflammability 1980, needle flame test non-flammable
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
