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參數(shù)資料
| 型號： | MMFT5P03HDT3 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 功率晶體管 |
| 英文描述： | 30V N-Channel PowerTrench MOSFET |
| 中文描述： | 3.7 A, 30 V, 0.1 ohm, P-CHANNEL, Si, POWER, MOSFET, TO-261AA |
| 封裝： | MINIATURE, CASE 318E-04, 4 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 198K |
| 代理商： | MMFT5P03HDT3 |
9
Motorola TMOS Power MOSFET Transistor Device Data
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.
SOT–223
0.079
2.0
0.15
3.8
0.248
6.3
0.079
2.0
0.059
1.5
0.059
1.5
0.059
1.5
0.091
2.3
0.091
2.3
mm
inches
SOT–223 POWER DISSIPATION
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
TJ(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, TA. Using the values
provided on the data sheet for the SOT–223 package, PD can
be calculated as follows:
PD =
TJ(max) – TA
R
θ
JA
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 TA of 25
°
C, one can
calculate the power dissipation of the device which in this case
is 3.13 watts.
PD =
150
°
C – 25
°
C
40
°
C/W
= 3.13 watts
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
. 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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