Product specification
3
Chip Resistor Surface Mount
Thick film technology
INTRODUCTION
16
S U M M A R I Z I N G
is the reciprocal of the heat resistance and is the
Description
Dimensions, conductance of materials and
mounting determine
Heat resistance × dissipation gives
Temperature rise + ambient temperature give
Relationship
heat resistance
temperature rise
hot-spot
temperature
characteristic for the resistor and its environment.
T H E T E M P E R A T U R E C O E F F I C I E N T
The temperature coefficient of resistance is a ratio
which indicates the rate of increase (decrease) of
resistance per degree (°C) increase (decrease) of
temperature within a specified range, and is
expressed in parts per million per °C (ppm/°C).
T m ? T amb
P E R F O R M A N C E
When specifying the performance of a resistor, the
dissipation is given as a function of the hot-spot
temperature, with the ambient temperature as a
parameter.
From ? T = A × P and T m = T amb ? ? T it follows
that:
P ?
A
If P is plotted against Tm for a constant value of A,
parallel straight lines are obtained for different
values of the ambient temperature. The slope of
these lines,
E XAMPLE
If the temperature coefficient of a resistor of
R nom = 1 k X between –55 °C and +155 °C is ±200
ppm/°C, its resistance will be:
at 25 °C:
1,000 X (nominal = rated value)
at +155 °C:
1,000 X ±(130 × 200 ppm/°C) × 1,000 X
= 1,026 X or 974 X
at –55 °C:
1,000 X ±(80 × 200 ppm/°C) × 1,000 X
= 1,016 X or 984 X
If the temperature coefficient is specified as ≤ 200
dP
dT m
?
I
A
ppm/°C the resistance will be within the shaded area
as shown in Fig. 1.
handbook, full pagewidth
2.6%
1.6%
26 Ω
T ( C)
R nom
55
0
2 5
o
155
1.6%
16 Ω
2.6%
MGA208
Fig. 1 Temperature coefficient.
www.yageo.com
Mar 25, 2008 V.7
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