2381 640 3/4/6....
Vishay BCcomponents
NTC Thermistors, Accuracy Line
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
QUICK REFERENCE DATA
PARAMETER
Resistance value at 25
°C
Tolerance on R
25
-value
Tolerance on B
25/85
-value
Maximum dissipation
Dissipation factor
δ
(for information only)
Response time
Thermal time constant
τ
(for
information only)
Operating temperature range:
at zero dissipation; continuously
at zero dissipation;
for short periods
at maximum dissipation (500 mW)
Climatic category
Mass
VALUE
3.3
Ω
to 470 kΩ
±2%; ±3%; ±5%; ±10%
±0.5%
to
±3%
500 mW
7 mW/K
8.5 mW/K
(for 640..338 to 689)
1.2 s
15 s
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.
−40
to +125
°C
≤150 °C
0 to 55
°C
40/125/56
≈0.3
g
ELECTRICAL DATA AND ORDERING INFORMATION
R
25
(Ω)
3.3
4.7
6.8
10
15
22
33
47
68
100
150
220
330
470
680
1000
1500
www.vishay.com
70
B
25/85
-VALUE
R
25
±2%
2880 K
±3%
2880 K
±3%
2880 K
±3%
2990 K
±3%
3041 K
±3%
3136 K
±3%
3390 K
±3%
3390 K
±3%
3390 K
±3%
3560 K
±0.75%
3560 K
±0.75%
3560 K
±0.75%
3560 K
±0.75%
3560 K
±0.5%
3560 K
±0.5%
3528 K
±0.5%
3528 K
±0.5%
4338
4478
4688
4109
4159
4229
4339
4479
4689
4101
4151
4221
4331
4471
4681
4102
4152
CATALOG NUMBER 2381 640 6....
R
25
±3%
6338
6478
6688
6109
6159
6229
6339
6479
6689
6101
6151
6221
6331
6471
6681
6102
6152
R
25
±5%
3338
3478
3688
3109
3159
3229
3339
3479
3689
3101
3151
3221
3331
3471
3681
3102
3152
R
25
±10%
2338
2478
2688
2109
2159
2229
2339
2479
2689
2101
2151
2221
2331
2471
2681
2102
2152
I
orange
yellow
blue
brown
brown
red
orange
yellow
blue
brown
brown
red
orange
yellow
blue
brown
brown
COLOR CODE
(see dimensions
drawing and note 1)
II
orange
violet
grey
black
green
red
orange
violet
grey
black
green
red
orange
violet
grey
black
green
III
gold
gold
gold
black
black
black
black
black
black
brown
brown
brown
brown
brown
brown
red
red
For technical questions contact: nlr.europe@vishay.com
Document Number: 29049
Revision: 12-Apr-05
2381 640 3/4/6....
NTC Thermistors, Accuracy Line
Vishay BCcomponents
R
25
(Ω)
2000
2200
2700
3300
4700
6800
10000
12000
15000
22000
33000
47000
68000
100000
150000
220000
330000
470000
Notes
B
25/85
-VALUE
R
25
±2%
3528 K
±0.5%
3977 K
±0.75%
3977 K
±0.75%
3977 K
±0.75%
3977 K
±0.75%
3977 K
±0.75%
3977 K
±0.75%
3740 K
±2%
3740 K
±2%
3740 K
±2%
4090 K
±1.5%
4090 K
±1.5%
4190 K
±1.5%
4190 K
±1.5%
4370 K
±2.5%
4370 K
±2.5%
4570 K
±1.5%
4570 K
±1.5%
4202
4222
4272
4332
4472
4682
4103
4123
4153
4223
4333
4473
4683
4104
4154
4224
4334
4474
CATALOG NUMBER 2381 640 6....
R
25
±3%
6202
6222
6272
6332
6472
6682
6103
6123
6153
6223
6333
6473
6683
6104
6154
6224
6334
6474
R
25
±5%
3202
3222
3272
3332
3472
3682
3103
3123
3153
3223
3333
3473
3683
3104
3154
3224
3334
3474
R
25
±10%
2202
2222
2272
2332
2472
2682
2103
2123
2153
2223
2333
2473
2683
2104
2154
2224
2334
2474
I
COLOR CODE
(see dimensions
drawing and note 1)
II
black
red
violet
orange
violet
grey
black
red
green
red
orange
violet
grey
black
green
red
orange
violet
III
red
red
red
red
red
red
orange
orange
orange
orange
orange
orange
orange
yellow
yellow
yellow
yellow
yellow
red
red
red
orange
yellow
blue
brown
brown
brown
red
orange
yellow
blue
brown
brown
red
orange
yellow
DERATING AND TEMPERATURE TOLERANCES
P
(%)
100
1. Dependent upon R
25
-tolerance, the band IV is coloured as follows:
a) for R
25
±2%,
band IV is coloured red
b) for R
25
±3%,
band IV is coloured orange
c) for R
25
±5%,
band IV is coloured gold
d) for R
25
±10%,
band IV is coloured silver.
Power derating curve.
0
40
0
55
85
Tamb (
o
C)
125
DIMENSIONS
in millimeters
B
Ι
ΙΙ
ΙΙΙ
ΛΙ
T
PHYSICAL DIMENSIONS FOR RELEVANT TYPE
CODE
NUMBER B
max
2381 640
.....
H
1
d
MIN.
MAX.
H
2
max
L
P
T
max
H
2
H
1
6.338 to
6.221
6.331 to
6.474
5.0
0.6
±0.06
1.0
−
4.0
2.0
±1.0
6.0
6.0
24
±1.5
24
±1.5
2.54
2.54
4.0
3.0
L
3.3
0.6
±0.5 ±0.06
MARKING
The thermistors are marked with coloured bands; see
dimensions drawing and “Electrical data and ordering
information”.
d
P
2381 640 6.338 to 6.474.
MOUNTING
By soldering in any position.
Document Number: 29049
Revision: 12-Apr-05
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71
2381 640 3/4/6....
Vishay BCcomponents
NTC Thermistors, Accuracy Line
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
∆T
(K)
3.0
1
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
5
2.5
2
2.0
3
1.5
4
Curves valid for 2.2 to 10 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
Curve 4:
∆R
25
/R
25
= 1%
(for 2381 640 5.... series only).
∆T
(K)
4
1
2
3
Curves valid for 12 to 22 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
3
2
1.0
1
0.5
0
40
0
40
80
120
160
o
T ( C)
0
40
0
40
80
120
160
o
T ( C)
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
∆T
(K)
4.0
3.5
3.0
2.5
4
2.0
1.5
1.0
0.5
0
40
2
3
1
Curves valid for 33 to 47 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
Curve 4:
∆R
25
/R
25
= 1%
(for 2381 640 5.... series only).
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
∆T
(K)
4.0
1
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
40
2
3
4
Curves valid for 68 to 100 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
Curve 4:
∆R
25
/R
25
= 1%
(for 2381 640 5.... series only).
0
40
80
120
160
o
T ( C)
0
40
80
120
160
o
T ( C)
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
∆T
(K)
5
6
1
2
3
Curves valid for 150 to 220 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE.
∆T
(K)
4.0
3.5
3.0
2.5
2.0
1.5
1
Curves valid for 330 to 470 kΩ.
Curve 1:
∆R
25
/R
25
= 5%.
Curve 2:
∆R
25
/R
25
= 3%.
Curve 3:
∆R
25
/R
25
= 2%.
2
3
4
3
2
1.0
1
0.5
0
40
0
40
80
120
160
o
T ( C)
0
40
0
40
80
120
160
o
T ( C)
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72
For technical questions contact: nlr.europe@vishay.com
Document Number: 29049
Revision: 12-Apr-05
2381 640 3/4/6....
NTC Thermistors, Accuracy Line
Vishay BCcomponents
R
T
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.
DETERMINATION OF THE
RESISTANCE/TEMPERATURE DEVIATION
FROM NOMINAL VALUE
The total resistance deviation is obtained by combining the
‘R
25
-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:
When:
TC = temperature coefficient
∆T
= temperature deviation,
Z
then:
∆T
=
-------
-
TC
X
Y
Z
=
⎛
1
+
---------
⎞ × ⎛
1
+
---------
⎞
–
1
-
-
⎝
100
⎠ ⎝
100
⎠
×
100 %
or Z
≈
X + Y.
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”):
R (T)
=
R
ref
×
e
(
A
+
B
⁄
T
+
C
⁄
T
+
D
⁄
T
)
2
3
(1)
(2)
2
R
3
R
R
-
-
T (R) =
⎛
A
1
+
B
1
ln ---------
+
C
1
ln ---------
+
D
1
ln ---------
⎞
-
⎝
R
ref
R
ref
⎠
R
ref
–
1
where:
A, B, C, D, A
1
, B
1
, C
1
and D
1
are constant values
depending on the material concerned; see table below.
R
ref
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 °C
to +25
°C
.
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:
⎧
5
Z
=
⎨
1
+
---------
-
100
⎩
⎫
0.89
×
1
+
----------
–
1
⎬ ×
100%
-
100
⎭
·
=
{
1.05
×
1.0089
–
1
} ×
100%
=
5.9345%
( ≈
5.93%
)
Z
5.93
∆T
=
-------
=
----------
=
1.167
°C ( ≈
1.17
°
C)
-
-
TC 5.08
A NTC with a R
25
-value of 10 kΩ has a value of 32.56 kΩ
between
−1.17
and +1.17
°C.
PARAMETERS FOR DETERMINING NOMINAL RESISTANCE VALUES
B
25/85
(K)
1
2
3
4
5
6
2880
2990
3041
3136
3390
3528
(1
3528
(2
3560
3740
3977
4090
4190
4370
4570
NAME
mat O. with Bn = 2880K
mat P. with Bn = 3990K
mat Q. with Bn = 3041K
mat R. with Bn = 3136K
mat S. with Bn = 3390K
mat I. with Bn = 3528K
TOL. B
VALU
E%
3
3
3
3
3
0.5
0.75
2
0.75
1.5
1.5
2.5
1.5
A
-9.094
-10.2296
-11.1334
-12.4493
-12.6814
-12.0596
-21.0704
-13.0723
-13.8973
-14.6337
-15.5322
-16.0349
-16.8717
-17.6439
B
(K)
2251.74
2887.62
3658.73
4702.74
4391.97
3687.667
11903.95
4190.574
4557.725
4791.842
5229.973
5459.339
5759.15
6022.726
C
(10
5
K
2
)
229098
132336
-102895
-402687
-232807
-7617.13
-2504699
-47158.40
-98275
-115334
-160451
-191141
-194267
-203157
D
A
1
(10
−3
)
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
3.354016
B
1
−4
K
−1
)
(10
3.495020
3.415560
3.349290
3.243880
2.993410
2.909670
2.933910
2.884190
2.744030
2.569850
2.519110
2.460380
2.367720
2.264100
C
1
−6
K
−2
)
(10
2.09596E-06
4.95546E-06
3.68384E-06
2.65801E-06
2.13513E-06
1.63214E-06
3.49431E-06
4.11803E-06
3.66694E-06
2.62013E-06
3.51094E-06
3.40538E-06
3.58514E-06
3.27818E-06
D
1
−7
K
−3
)
(10
4.26062E-07
4.36424E-07
7.05046E-08
-2.70156E-0
-8.05672E-0
7.1922E-08
-7.71269E-0
1.78679E-07
1.37549E-07
6.38309E-08
1.10518E-07
1.03424E-07
1.25535E-07
1.09763E-07
7
mat H. with Bn = 3560K
8
mat B. with Bn = 3740K
9
mat A. with Bn = 3977K
10
mat C. with Bn = 4090K
11
mat D. with Bn = 4190K
12
mat E. with Bn = 4370K
13
mat F. with Bn = 4570K
Notes
1. Temperature < 25
°C.
2. Temperature
≥25 °C.
Document Number: 29049
Revision: 12-Apr-05
-27448200
-25025100
516652
616652
3196830
1509643
-5914730
247033800
-11992560.
-7522357
-3730535
-5414091
-3328322
-6869149
-7183526
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
73
2381 640 3/4/6....
Vishay BCcomponents
NTC Thermistors, Accuracy Line
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
T
oper
(°C)
−40
−35
−30
−25
−20
−15
−10
−5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
R
T
/R
25
∆R
DUE TO
B-TOLERANCE
(%)
8.08
7.30
6.55
5.84
5.15
4.49
3.85
3.24
2.65
2.08
1.54
1.01
0.49
0.00
0.48
0.94
1.39
1.82
2.24
2.65
3.04
3.43
3.80
4.16
4.51
4.85
5.19
5.51
5.82
6.13
6.43
6.72
7.00
7.28
7.55
7.81
8.07
8.32
8.56
TC
(%/K)
−4.97
−4.80
−4.64
−4.48
−4.33
−4.19
−4.05
−3.92
−3.79
−3.66
−3.55
−3.43
−3.32
−3.22
−3.12
−3.02
−2.93
−2.84
−2.76
−2.68
−2.60
−2.52
−2.45
−2.38
−2.32
−2.25
−2.19
−2.13
−2.07
−2.02
−1.97
−1.92
−1.87
−1.82
−1.77
−1.73
−1.69
−1.65
−1.61
6.338
45.00
35.25
27.84
22.16
17.78
14.37
11.69
9.58
7.90
6.56
5.48
4.60
3.89
3.30
2.82
2.42
2.08
1.80
1.57
1.37
1.20
1.05
0.93
0.82
0.73
0.65
0.59
0.53
0.47
0.43
0.39
0.35
0.32
0.29
0.27
0.24
0.22
0.21
0.19
R
25
(Ω)
2381 640 .....;
see note 1 at end of tables
6.478
64.09
50.20
39.64
31.56
25.32
20.46
16.65
13.65
11.26
9.34
7.80
6.55
5.54
4.70
4.01
3.44
2.96
2.57
2.23
1.95
1.71
1.50
1.33
1.17
1.04
0.93
0.83
0.75
0.67
0.61
0.55
0.50
0.45
0.41
0.38
0.35
0.32
0.29
0.27
6.688
92.73
72.63
57.36
45.66
36.63
29.60
24.09
19.74
16.29
13.52
11.29
9.48
8.01
6.80
5.80
4.98
4.29
3.71
3.23
2.82
2.47
2.17
1.92
1.70
1.51
1.35
1.21
1.08
0.97
0.88
0.80
0.72
0.66
0.60
0.55
0.50
0.46
0.42
0.39
13.6364
10.6806
8.4350
6.7148
5.3866
4.3532
3.5432
2.9035
2.3950
1.9880
1.6602
1.3944
1.1777
1.0000
0.8534
0.7319
0.6307
0.5459
0.4746
0.4143
0.3631
0.3194
0.2820
0.2499
0.2222
0.1982
0.1774
0.1592
0.1433
0.1294
0.1171
0.1063
0.0967
0.0882
0.0806
0.0739
0.0678
0.0624
0.0575
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
T
oper
(°C)
−40
−35
−30
−25
−20
−15
−10
−5
0
www.vishay.com
74
R
T
/R
25
∆R
DUE TO
B-TOLERANCE
(%)
8.39
7.58
6.81
6.06
5.35
4.66
4.00
3.37
2.75
TC
(%/K)
−4.86
−4.72
−4.58
−4.44
−4.31
−4.18
−4.06
−3.94
−3.82
For technical questions contact: nlr.europe@vishay.com
R
25
(Ω)
2381 640 .....;
see note 1 at end of tables
6.109
136.75
107.63
85.32
68.10
54.72
44.25
36.02
29.49
24.30
Document Number: 29049
Revision: 12-Apr-05
13.675
10.763
8.5318
6.8097
5.4717
4.4253
3.6017
2.9494
2.4295
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