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N_06R00333 Datasheet(PDF) 3 Page - AVX Corporation

Part No. N_06R00333
Description  NTC Thermistors
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Maker  AVX [AVX Corporation]
Homepage  http://www.avx.com
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2
1 – INTRODUCTION
NTC thermistors are thermally sensitive resistors made from
a mixture of Mn, Ni, Co, Cu, Fe oxides. Sintered ceramic
bodies of various sizes can be obtained. Strict conditions
of mixing, pressing, sintering and metallization ensure an
excellent batch-to-batch product characteristics.
This semi-conducting material reacts as an NTC resistor,
whose resistance decreases with increasing temperature.
This Negative Temperature Coefficient effect can result from
an external change of the ambient temperature or an inter-
nal heating due to the Joule effect of a current flowing
through the thermistor.
By varying the composition and the size of the thermistors,
a wide range of resistance values (0.1Ω to 1MΩ) and tem-
perature coefficients (-2 to -6% per °C) can be achieved.
RoHS (Restriction of Hazardous Substances - European
Union directive 2002/95/EC).
ELV (End of Life-Vehicle - European Union directive
2000/53/EC).
All Thermistor Products have been fully RoHS/ELV since
before 2006.
Chip Thermistor NB RoHS/ELV Status: external Plating
100% smooth semi-bright Sn as standard SnPb Termination
available on request.
2 – MAIN CHARACTERISTICS
2.1 CHARACTERISTICS WITH NO DISSIPATION
2.1.1. Nominal Resistance (Rn)
The nominal resistance of an NTC thermistor is generally
given at 25°C. It has to be measured at near zero power
so that the resultant heating only produces a negligible
measurement error.
The following table gives the maximum advised measure-
ment voltage as a function of resistance values and thermal
dissipation factors.
This voltage is such that the heating effect generated by the
measurement current only causes a resistance change of
1%
ΔRn/Rn.
2.1.2. Temperature -
Resistance characteristics R (T)
This is the relation between the zero power resistance and
the temperature. It can be determined by experimental mea-
surements and may be described by the ratios R (T) /R
(25°C) where:
R (T)
is the resistance at any temperature T
R (25°C) is the resistance at 25°C.
These ratios are displayed on pages 29 to 33.
2.1.3. Temperature coefficient (
α)
The temperature coefficient ( ) which is the slope of the
curve at a given point is defined by:
100
dR
=
and expressed in % per °C.
RdT
2.1.4. Sensitivity index (B)
The equation R = A exp (B/T) may be used as a rough
approximation of the characteristic R (T).
B is called the sensitivity index or constant of the material
used.
To calculate the B value, it is necessary to know the resis-
tances R
1 and R2 of the thermistor at the temperatures
T
1 and T2.
The equation: R
1 = R2 exp B
()
leads to:
B (K) =
1
• n
()
Conventionally, B will be most often calculated for tempe-
ratures T
1 = 25°C and T2 = 85°C (298.16 K and 358.16 K).
In fact, as the equation R = A exp (B/T) is an approximation,
the value of B depends on the temperatures T
1 and T2 by
which it is calculated.
For example, from the R (T) characteristic of material M
(values given on page 29), it can be calculated:
B (25 – 85) = 3950
B (0 – 60)
= 3901
B (50 – 110) = 3983
When using the equation R = A exp (B/T) for this material,
the error can vary by as much as 9% at 25°C, 0.6% at 55°C
and 1.6% at 125°C.
Using the same equation, it is possible to relate the values of
the index B and the coefficient
α:
1dR
=
• A exp (B/T) •
RdT
thus
= –
expressed in %/°C
NTC Thermistors
General Characteristics
Ranges of
Maximum measuring voltage
values
(V)
(Ω)
δ = 2 mW/°C δ = 5 mW/°C δ = 10 mW/°C δ = 20 mW/°C
R 10
0.10
10 < R 100
0.13
0.18
0.24
100 < R 1,000
0.25
0.38
0.53
0.24
1,000 < R 10,000
0.73
1.1
1.5
2.0
10,000 < R 100,000
2.1
3.2
4.6
R < 100,000
6.4
9.7
14.5
1 - 1
T
1
T
2
R
1
R
2
()
1 - 1
T
1
T
2
=
1
A exp (B/T)
-B
T2
B
T2




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