YC358TJK-074K7L Datasheet, PDF (3/16 Pages) List of Unclassifed Manufacturers – All thick film types of chip resistors have a rectangular ceramic body.

Chip Resistor Surface Mount ^{Thick film technology INTRODUCTION}
Product specification 3
16
SUMMARIZING
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
PERFORMANCE
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

T_m
 T_amb
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,
dP I
dT_m ^ A
is the reciprocal of the heat resistance and is the
characteristic for the resistor and its environment.
THE TEMPERATURE COEFFICIENT
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).
EXAMPLE
If the temperature coefficient of a resistor of
R_nom = 1 kX 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
ppm/°C the resistance will be within the shaded area
as shown in Fig. 1.
handbook, full pagewidth
2.6%
1.6%
26 Ω
R _nom
55
1.6%
2.6%
Fig. 1 Temperature coefficient.
0
25
16 Ω
T ( ^oC)
155
MGA208
Mar 25, 2008 V.7
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