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參數(shù)資料
| 型號： | MSC2712YT1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 功率晶體管 |
| 英文描述： | General Purpose Amplifier Transistor |
| 中文描述： | 100 mA, 50 V, NPN, Si, SMALL SIGNAL TRANSISTOR |
| 封裝： | CASE 318D-04, SC-59, 3 PIN |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 44K |
| 代理商： | MSC2712YT1 |
MSC2712GT1, MSC2712YT1
http://onsemi.com
3
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)
T
MAX
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
140
°
C
Figure 1. Typical Solder Heating Profile
DESIRED CURVE FOR HIGH
MASS ASSEMBLIES
170
°
C
For any given circuit board, there will be a group of con-
trol settings that will give the desired heat pattern. The op-
erator must set temperatures for several heating zones, and
a figure for belt speed. Taken together, these control set-
tings make up a heating “profile” for that particular circuit
board. On machines controlled by a computer, the comput-
er remembers these profiles from one operating session to
the next. Figure 7 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 pro-
file
shows
temperature
versus
time.
SOLDER STENCIL GUIDELINES
Prior to placing surface mount components onto a printed
circuit board, solder paste must be applied to the pads. A
solder stencil is required to screen the optimum amount of
solder paste onto the footprint. The stencil is made of brass
or stainless steel with a typical thickness of 0.008 inches.
The stencil opening size for the surface mounted package
should be the same as the pad size on the printed circuit
board, i.e., a 1:1 registration.
TYPICAL SOLDER HEATING PROFILE
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
177189
°
C. When this type of furnace is used for solder re-
flow work, the circuit boards and solder joints tend to heat
first. The components on the board are then heated by con-
duction. The circuit board, because it has a large surface
area, absorbs the thermal energy more efficiently, then dis-
tributes this energy to the components. Because of this ef-
fect, the main body of a component may be up to 30 degrees
cooler than the adjacent solder joints.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MSC2712YT1G | 功能描述:兩極晶體管 - BJT 100mA 60V NPN RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2 |
| MSC2A100H22 | 制造商:RFE 制造商全稱:RFE international 功能描述:PTC THERMISTOR Motor Applications |
| MSC2A101H41 | 制造商:RFE 制造商全稱:RFE international 功能描述:PTC THERMISTOR Motor Applications |
| MSC2A150H25 | 制造商:RFE 制造商全稱:RFE international 功能描述:PTC THERMISTOR Motor Applications |
| MSC2A220H30 | 制造商:RFE 制造商全稱:RFE international 功能描述:PTC THERMISTOR Motor Applications |
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