1997 Nov 14 1
Philips Components Product specification
NTC thermistors, accuracy line 2322 640 5....
FEATURES
•Accurate over a wide temperature
range (tolerance on B-value
between 2.5% and 0.75%)
•Good stability over a long life
•Excellent price/performance ratio
•Flexible leads
•Low heat conductivity through
0.4 mm diameter Ni-leads.
APPLICATION
Temperature sensing and control.
DESCRIPTION
These thermistors have a negative
temperature coefficient. The device
consists of a chip with two tinned
Ni-leads. The device is colour coded.
QUICK REFERENCE DATA
PARAMETER VALUE UNIT
Resistance value at 25 °C 2.7 to 470 kΩ
Tolerance on R25-value ±5; ±3; ±2; ±1%
Tolerance on B25/85-value ±2.5 to ±0.75 %
Maximum dissipation 100 mW
Response time (for information only) 1.7 s
Operating temperature range:
at zero dissipation (continuously) −40 to +125 °C
at zero dissipation (for short periods) ≤150 °C
at maximum dissipation (100 mW) 0 to +55 °C
Climatic category 40/125/56
Mass ≈0.11 g
PACKAGING
The thermistors are packed in
cardboard boxes; the smallest
packing quantity is 500 units.
MECHANICAL DATA
Marking
The thermistors are marked with
coloured bands; see Fig.1 and
Table 1.
Mounting
By soldering in any position.
Outline
Fig.1 Component outline.
handbook, halfpage
MBA933 - 1
,
,,,
,,,
2.54
2
1
O
38
min
3.4 max
,
,,
,,
3
max
0.8
O 0.4
I
II
I
II
Dimensions in mm.
1997 Nov 14 2
Philips Components Product specification
NTC thermistors, accuracy line 2322 640 5....
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, measurements are in accordance with
“IEC publication 539”
; see also Table 1.
Notes
1. Response time in silicone oil MS 200/50. This is the time needed for the sensor to reach 63.2% of the total
temperature difference when subjected to a temperature change from 25 °C in air to 85 °C in oil.
2. Valid for all types with the exception of 2322 640 5.474.
Table 1 R25-values, catalogue numbers and coding; note 1
The thermistors have a 12-digit catalogue number starting with 2322 640 5. The subsequent 4 digits indicate the
resistance value and tolerance.
Note
1. Extended range available on request.
PARAMETER VALUE UNIT
Standard selection tolerance on R25 ±5; ±3; ±2 and ±1%
Stability in accordance with
“CECC 43000”
and
“IEC 68-2”
see Table 2
Climatic category 40/125/56
Maximum dissipation 100 mW
Dissipation factors δ(for information only) 2.2 mW/K
Response time (for information only); note 1 1.7 s
Thermal time constant τ (for information only) 13 s
Operating temperature range (see Fig.2):
at zero dissipation (continuously) −40 to +125 °C
at zero dissipation (for short periods); note 2 ≤150 °C
at maximum dissipation 0 to +55 °C
R25
(kΩ)B25/85-VALUE CATALOGUE NUMBER 2322 640 5.... CODING (see Fig.1)
R25 ±5% R25 ±3% R25 ±2% R25 ±1% I II
2.7 3977 K ±0.75% 3272 6272 4272 5272 red red
4.7 3977 K ±0.75% 3472 6472 4472 5472 green green
10 3977 K ±0.75% 3103 6103 4103 5103 blue blue
47 4090 K ±1.5% 3473 6473 4473 5473 black black
68 4190 K ±1.5% 3683 6683 4683 −grey grey
100 4190 K ±1.5% 3104 6104 4104 5104 brown brown
470 4570 K ±1.5% 3474 6474 4474 −violet violet
1997 Nov 14 3
Philips Components Product specification
NTC thermistors, accuracy line 2322 640 5....
Table 2 Resistance values at intermediate temperatures
Tamb
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2322 640 .....; note 1
5.222 5.272 5.332 5.472 5.682 5.103
−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
−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
1997 Nov 14 4
Philips Components Product specification
NTC thermistors, accuracy line 2322 640 5....
Note
1. Replace dot in last 5 digits of catalogue 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%.
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
Tamb
(°C) RT/R25
∆R DUE TO
B-TOLERANCE
(%)
TC
(%/K)
R25
(kΩ)
2322 640 .....; note 1
5.222 5.272 5.332 5.472 5.682 5.103
1997 Nov 14 5
Philips Components Product specification
NTC thermistors, accuracy line 2322 640 5....
Derating
Fig.2 Power derating curve.
MLC342
05540 85 125
T ( C)
o
100
0
P
(%)
amb
RT-values and tolerance on
RT-values
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.
Long term stability
Fig.3 Long term stability of R25 as a function of test
duration at maximum temperature (150 °C).
handbook, halfpage
0.4
0.2
0
0.2 104
MLC382
103
102
∆R25
R25
(%)
test duration (h)
3
2
1
Curves valid for 2.2 to 10 kΩ.
Curve 1: maximum deviation.
Curve 2: average deviation.
Curve 3: minimum deviation.
Fig.4 Long term stability of T as a function of test
duration at maximum temperature (150 °C).
handbook, halfpage
0.05
0
0.05
0.1 104
MLC383
103
102test duration (h)
3
2
1
∆T
(K)
Curves valid for 2.2 to 10 kΩ.
Curve 1: minimum deviation.
Curve 2: average deviation.
Curve 3: maximum deviation.
