NTC Thermistors, Radial Leaded, Standard Precision
QUICK REFERENCE DATA
PARAMETERVALUEUNIT
Resistance value at 25 °C3.3 to 470K
Tolerance on R
B
-value2880 to 4570K
25/85
Tolerance on B
Operating temperature range:
At zero power dissipation;
continuously
At zero power dissipation;
for short periods
Response time (in oil) 1.2s
Thermal time constant
(for information only)
Dissipation factor
(for information only)
Maximum power dissipation
at 55 °C
Climatic category
(LCT/UCT/days)
Weight 0.3g
-value± 2; ± 3; ± 5%
25
-value± 0.5 to ± 3%
25/85
- 40 to + 125
150
15s
7
(for R
8.5
-value 680 )
25
500mW
40/125/56-
°C
mW/K
NTCLE100E3
Vishay BCcomponents
FEATURES
• Accuracy over a wide temperature range
• High stability over a long life
• Excellent price/performance ratio
• UL recognized, file E148885
• Material categorization:
For definitions of compliance please see
www.vishay.com/doc?99912
APPLICATIONS
• Temperature measurement, sensing and control,
temperature compensation in industrial and consumer
electronics
DESCRIPTION
These thermistors have a negative temperature coefficient.
The device consists of a chip with two solid copper tin
plated leads. It is grey lacquered and color coded, but not
insulated.
PACKAGING
The thermistors are packed in bulk or tape on reel; see code
numbers and relevant packaging quantities.
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE
5
ΔT
(K)
4
3
2
1
0
-
40160
04080120
Curves valid for 12 kΩ to 22 kΩ
1
Curve 1: ΔR
Curve 2: ΔR
Curve 3: ΔR
2
3
T (°C)
25/R25
25/R25
25/R25
= 5 %
= 3 %
= 2 %
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE
0.5
0
-
40160
04080120
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE
Revision: 24-Aug-12
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
T (°C)
TEMPERATURE DEVIATION AS A FUNCTION
OF THE AMBIENT TEMPERATURE
4.0
ΔT
(K)
3.5
3.0
2.5
2.0
1.5
1.0
For technical questions, contact: nlr@vishay.com
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
0.5
0
-
40160
04080120
3
Curves valid for 330 kΩ to 470 kΩ
1
2
3
T (°C)
Curve 1: ΔR
Curve 2: ΔR
Curve 3: ΔR
25/R25
25/R25
25/R25
= 5 %
= 3 %
= 2 %
Document Number: 29049
www.vishay.com
R
T
R
ref
e
ABTCT2DT3++ +
=
(1)
T
R
= A1B
1
R
R
ref
----------lnC1ln
2 R
R
ref
----------
D
1
ln
3 R
R
ref
----------
+++
1–
(2)
Z1
X
100
----------
+
1
Y
100
----------
+
1–= 100 %
T
Z
TCR
------------
=
Z1
5
100
----------
+ 1
0.89
100
-----------
+1–
100%=
T
Z
TCR
------------
5.93
5.08
-----------
1.167 C 1.17 C===
1.05 1.0089 1–100 %5.9345 %=( 5.93 %)=
NTCLE100E3
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”):
where:
A, B, C, D, A
depending on the material concerned; see table below.
is the resistance value at a reference temperature (in
R
ref.
this event 25 °C, R
T is the temperature in K.
Formulae numbered and 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.
, B1, C1 and D1 are constant values
1
= R25).
ref.
DETERMINATION OF THE
RESISTANCE/TEMPERATURE DEVIATION
FROM NOMINAL VALUE
The total resistance deviation is obtained by combining
the “R
B-tolerance”.
When:
then: or Z X + Y
When:
then:
The temperature tolerances are plotted in the graphs on the
previous page.
Example: at 0 °C, assume X = 5 %, Y = 0.89 % and
TCR
A NTC with a R25-value of 10 k has a value of 32.56 k
between - 1.17 °C and + 1.17 °C.
-tolerance” and the “resistance deviation due to
25
-tolerance
X = R
25
Y = resistance deviation due to B-tolerance
Z = complete resistance deviation,
TCR = temperature coefficient
T = temperature deviation,
= 5.08 %/K (see table ), then:
PARAMETER FOR DETERMINING NOMINAL RESISTANCE VALUES