MMFT5P03HD
INFORMATION FOR USING THE SOT ? 223 SURFACE MOUNT PACKAGE
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a critical portion of the
total design. The footprint for the semiconductor packages
must be the correct size to insure proper solder connection
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
0.15
3.8
0.079
2.0
0.248
0.079
2.0
0.091
2.3
0.091
2.3
6.3
0.059
1.5
0.059
1.5
0.059
1.5
inches
mm
SOT ? 223 POWER DISSIPATION
T J(max) ? T A
R θ JA
The power dissipation of the SOT ? 223 is a function of
the drain pad size. This can vary from the minimum pad
size for soldering to a pad size given for maximum power
dissipation. Power dissipation for a surface mount device is
determined by T J(max) , the maximum rated junction
temperature of the die, R θ JA , the thermal resistance from
the device junction to ambient, and the operating
temperature, T A . Using the values provided on the data
sheet for the SOT ? 223 package, P D can be calculated as
follows:
P D =
The values for the equation are found in the maximum
ratings table on the data sheet. Substituting these values
into the equation for an ambient temperature T A of 25 ° C,
one can calculate the power dissipation of the device which
in this case is 3.13 watts.
P D = 150 ° C ? 25 ° C = 3.13 watts
40 ° C/W
The 40 ° C/W for the SOT ? 223 package assumes the use
of the recommended footprint on a glass epoxy printed
circuit board to achieve a power dissipation of 3.13 watts.
There are other alternatives to achieving higher power
dissipation from the SOT ? 223 package. One is to increase
the area of the drain pad. By increasing the area of the drain
pad, the power dissipation can be increased. Although one
can almost double the power dissipation with this method,
one will be giving up area on the printed circuit board
which can defeat the purpose of using surface mount
technology.
Another alternative would be to use a ceramic substrate
or an aluminum core board such as Thermal Clad t . Using
a board material such as Thermal Clad, an aluminum core
board, the power dissipation can be doubled using the same
footprint.
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