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参数资料
| 型号： | MMUN2232LT3 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 小信号晶体管 |
| 英文描述： | 100 mA, 50 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-236AB |
| 封装： | TO-236AB, 3 PIN |
| 文件页数： | 2/12页 |
| 文件大小： | 181K |
| 代理商： | MMUN2232LT3 |
MMUN2211LT1 SERIES
10
Motorola Small–Signal Transistors, FETs and Diodes Device Data
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
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 25 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
DESIRED CURVE FOR HIGH
MASS ASSEMBLIES
100
°C
150
°C
160
°C
170
°C
140
°C
Figure 25. Typical Solder Heating Profile
相关PDF资料 |
PDF描述 |
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| MMUN2213LT3 | 100 mA, 50 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-236AB |
| MMUN2215LT3 | 100 mA, 50 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-236AB |
| MMUN2233LT3 | 100 mA, 50 V, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-236AB |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MMUN2232RLT1 | 制造商:ETL 制造商全称:E-Tech Electronics LTD 功能描述:Bias Resistor Transistor |
| MMUN2233 | 制造商:WEITRON 制造商全称:Weitron Technology 功能描述:Bias Resistor Transistor |
| MMUN2233L | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Digital Transistors (BRT) R1 = 4.7 k, R2 = 47 k |
| MMUN2233LT1 | 功能描述:开关晶体管 - 偏压电阻器 100mA 50V BRT NPN RoHS:否 制造商:ON Semiconductor 配置: 晶体管极性:NPN/PNP 典型输入电阻器: 典型电阻器比率: 安装风格:SMD/SMT 封装 / 箱体: 直流集电极/Base Gain hfe Min:200 mA 最大工作频率: 集电极—发射极最大电压 VCEO:50 V 集电极连续电流:150 mA 峰值直流集电极电流: 功率耗散:200 mW 最大工作温度: 封装:Reel |
| MMUN2233LT1G | 功能描述:开关晶体管 - 偏压电阻器 100mA 50V BRT NPN RoHS:否 制造商:ON Semiconductor 配置: 晶体管极性:NPN/PNP 典型输入电阻器: 典型电阻器比率: 安装风格:SMD/SMT 封装 / 箱体: 直流集电极/Base Gain hfe Min:200 mA 最大工作频率: 集电极—发射极最大电压 VCEO:50 V 集电极连续电流:150 mA 峰值直流集电极电流: 功率耗散:200 mW 最大工作温度: 封装:Reel |
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