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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
C
3.3
to 470 k
Tolerance on R
25
-value
2%; 3%; 5%; 10%
Tolerance on B
25/85
-value
0.5% to 3%
Maximum dissipation
500 mW
Dissipation factor
(for information only)
7 mW/K
8.5 mW/K
(for 640..338 to 689)
Response time
1.2 s
Thermal time constant
(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
R
25
(
)
B
25/85
-VALUE
CATALOG NUMBER 2381 640 6....
COLOR CODE
(see dimensions
drawing and note 1)
R
25
2%
R
25
3%
R
25
5%
R
25
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
Document Number: 29049
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 12-Apr-05
71
2381 640 3/4/6....
NTC Thermistors, Accuracy Line
Vishay BCcomponents
DERATING AND TEMPERATURE TOLERANCES
0
55
40
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
H
2
H
1
d
P
CODE
NUMBER
2381 640
.....
B
max
d
H
1
H
2
max
L
P
T
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 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.
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
R
25
(
)
B
25/85
-VALUE
CATALOG NUMBER 2381 640 6....
COLOR CODE
(see dimensions
drawing and note 1)
R
25
2%
R
25
3%
R
25
5%
R
25
10%
I
II
III
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29049
72
Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents
NTC Thermistors, Accuracy Line
Curves valid for 68 to 100 k
.
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).
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 2.2 to 10 k
.
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).
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 k
.
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).
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 k
.
Curve 1:
R
25
/R
25
= 5%.
Curve 2:
R
25
/R
25
= 3%.
Curve 3:
R
25
/R
25
= 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 k
.
Curve 1:
R
25
/R
25
= 5%.
Curve 2:
R
25
/R
25
= 3%.
Curve 3:
R
25
/R
25
= 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 k
.
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.
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.
Document Number: 29049
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 12-Apr-05
73
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.
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, 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
.
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:
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 R
25
-value of 10 k
has a value of 32.56 k
between
-1.17 and +1.17 C.
R (T)
R
=
ref
e
A
B T
/
C T
2
/
D T
3
/
+
+
+
(
)
T (R) = A
1
B
1
R
R
ref
----------
ln
C
1
ln
2
R
R
ref
----------
D
1
ln
3
R
R
ref
----------
+
+
+
1
Z
1
X
100
----------
+
1
Y
100
----------
+
1
=
100
%
T
Z
TC
--------
=
Z
1
5
100
----------
+
1
0.89
100
-----------
+
1
100%
=
1.05
1.0089
1
{
} 100% 5.9345%
5.93%
(
)
=
=
T
Z
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
B
25/85
(K)
NAME
TOL. B
VALU
E %
A
B
(K)
C
(10
5
K
2
)
D
A
1
(10
-3
)
B
1
(10
-4
K
-1
)
C
1
(10
-6
K
-2
)
D
1
(10
-7
K
-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
6
3528
(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
8
3740
mat B. with Bn = 3740K
2
-13.8973
4557.725
-98275
-7522357
3.354016
2.744030
3.66694E-06
1.37549E-07
9
3977
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
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29049
74
Revision: 12-Apr-05
2381 640 3/4/6....
Vishay BCcomponents
NTC Thermistors, Accuracy Line
RESISTANCE VALUES AT INTERMEDIATE TEMPERATURES
T
oper
(
C)
R
T
/R
25
R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R
25
(
)
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
T
oper
(
C)
R
T
/R
25
R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R
25
(
)
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