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參數(shù)資料
| 型號： | MMSF4205R2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | JFETs |
| 英文描述： | 8.8 A, 20 V, 0.014 ohm, P-CHANNEL, Si, POWER, MOSFET |
| 封裝： | CASE 751-06, SO-8 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 256K |
| 代理商： | MMSF4205R2 |
MMSF4205
http://onsemi.com
9
TYPICAL SOLDER HEATING PROFILE
For any given circuit board, there will be a group of control
settings that will give the desired heat pattern. The operator
must set temperatures for several heating zones and a figure
for belt speed. Taken together, these control settings make
up a heating “profile” for that particular circuit board. On
machines
controlled
by
a
computer,
the
computer
remembers these profiles from one operating session to the
next. Figure 16 shows a typical heating profile for use when
soldering a surface mount device to a printed circuit board.
This profile will vary among soldering systems, but it is a
good starting point. Factors that can affect the profile include
the type of soldering system in use, density and types of
components on the board, type of solder used, and the type
of board or substrate material being used. This profile shows
temperature versus time. The line on the graph shows the
actual temperature that might be experienced on the surface
of a test board at or near a central solder joint. The two
profiles are based on a high density and a low density board.
The Vitronics SMD310 convection/infrared reflow soldering
system was used to generate this profile. The type of solder
used was 62/36/2 Tin Lead Silver with a melting point
between 177 189
°C. When this type of furnace is used for
solder reflow work, the circuit boards and solder joints tend
to heat first. The components on the board are then heated
by conduction. The circuit board, because it has a large
surface area, absorbs the thermal energy more efficiently,
then distributes this energy to the components. Because of
this effect, the main body of a component may be up to 30
degrees cooler than the adjacent solder joints.
STEP 1
PREHEAT
ZONE 1
RAMP"
STEP 2
VENT
SOAK"
STEP 3
HEATING
ZONES 2 & 5
RAMP"
STEP 4
HEATING
ZONES 3 & 6
SOAK"
STEP 5
HEATING
ZONES 4 & 7
SPIKE"
STEP 6
VENT
STEP 7
COOLING
200
°C
150
°C
100
°C
50
°C
TIME (3 TO 7 MINUTES TOTAL)
TMAX
SOLDER IS LIQUID FOR
40 TO 80 SECONDS
(DEPENDING ON
MASS OF ASSEMBLY)
205
° TO 219°C
PEAK AT
SOLDER JOINT
DESIRED CURVE FOR LOW
MASS ASSEMBLIES
100
°C
150
°C
160
°C
170
°C
140
°C
Figure 16. Typical Solder Heating Profile
DESIRED CURVE FOR HIGH
MASS ASSEMBLIES
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