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EMA6DXV5T1 Fiches technique(PDF) 3 Page - ON Semiconductor

No de pièce EMA6DXV5T1
Description  Dual Common Emitter Bias Resistor Transistor PNP Silicon Surface Mount Transistors with Monolithic Bias Resistor Network
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

EMA6DXV5T1 Fiches technique(HTML) 3 Page - ON Semiconductor

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EMA6DXV5T1, EMA6DXV5T5
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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 150 milliwatts.
INFORMATION FOR USING THE SOT−553 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−553 POWER DISSIPATION
PD =
TJ(max) − TA
RqJA
PD =
150
°C − 25°C
833
°C/W
= 150 milliwatts
The power dissipation of the SOT−553 is a function of
the pad size. This can vary from the minimum pad size for
soldering to a pad size given for maximum power dissipa-
tion. Power dissipation for a surface mount device is deter-
mined by TJ(max), the maximum rated junction temperature
of the die, RqJA, 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−553 package, PD can be calculated as follows:
The 833
°C/W for the SOT−553 package assumes the use
of the recommended footprint on a glass epoxy printed
circuit board to achieve a power dissipation of 150 milli-
watts. There are other alternatives to achieving higher
power dissipation from the SOT−553 package. 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.
SOLDERING PRECAUTIONS
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. There-
fore, 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 shall be a maximum of 10
°C.
The soldering temperature and time shall not exceed
260
°C for more than 10 seconds.
When shifting from preheating to soldering, the
maximum temperature gradient shall 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 exces-
sive thermal shock and stress which can result in damage
to the device.
SOT−553
1.35
0.0531
0.5
0.0197
mm
inches
0.5
0.0197
1.0
0.0394
0.45
0.0177
0.3
0.0118


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