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參數(shù)資料
| 型號(hào)： | PZT2907AT3 |
| 英文描述： | TRANSISTOR | BJT | PNP | 60V V(BR)CEO | 600MA I(C) | TO-261AA |
| 中文描述： | 晶體管|晶體管|進(jìn)步黨| 60V的五（巴西）總裁| 600毫安一（c）|至261AA |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 58K |
| 代理商： | PZT2907AT3 |
PZT2907AT1
http://onsemi.com
4
INFORMATION FOR USING THE SOT-223 SURFACE MOUNT PACKAGE
POWER DISSIPATION
The power dissipation of the SOT-223 is a function of the
pad size. These can vary from the minimum pad size for
soldering to the 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
=
T
J(max)
– T
A
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 T
A
of 25
°
C, one can
calculate the power dissipation of the device which in this
case is 1.5 watts.
P
D
=
150
°
C – 25
°
C
83.3
°
C/W
= 1.5 watts
The 83.3
°
C/W for the SOT-223 package assumes the
recommended collector pad area of 965 sq. mils on a glass
epoxy printed circuit board to achieve a power dissipation of
1.5 watts. If space is at a premium, a more realistic approach
is to use the device at a P
D
of 833 mW using the footprint
shown. Using a board material such as Thermal Clad, a
power dissipation of 1.6 watts can be achieved using the
same footprint.
MOUNTING PRECAUTIONS
The soldering temperature and time should not exceed
260
°
C for more than 10 seconds.
When shifting from preheating to soldering, the
maximum temperature gradient should be 5
°
C or less.
After soldering has been completed, the device should
be allowed to cool naturally for at least three minutes.
Gradual cooling should be used as the use of forced
cooling will increase the temperature gradient and
result in latent failure due to mechanical stress.
Mechanical stress or shock should not be applied
during cooling
* Soldering a device without preheating can cause
excessive thermal shock and stress which can result in
damage to the device.
The melting temperature of solder is higher than the rated
temperature of the device. When the entire device is heated
to a high temperature, failure to complete soldering within
a short time could result in device failure. Therefore, the
following items should always be observed in order to
minimize the thermal stress to which the devices are
subjected.
Always preheat the device.
The delta temperature between the preheat and
soldering should be 100
°
C or less.*
When preheating and soldering, the temperature of the
leads and the case must not exceed the maximum
temperature ratings as shown on the data sheet. When
using infrared heating with the reflow soldering
method, the difference should be a maximum of 10
°
C.
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.
0.079
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
mm
inches
0.091
2.3
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