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參數(shù)資料
| 型號： | NTQD6866R2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 小信號晶體管 |
| 英文描述： | Power MOSFET 6.9 Amps, 20 Volts |
| 中文描述： | 4700 mA, 20 V, 2 CHANNEL, N-CHANNEL, Si, SMALL SIGNAL, MOSFET |
| 封裝： | PLASTIC, CASE 948S-01, TSSOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 71K |
| 代理商： | NTQD6866R2 |
NTQD6866R2
http://onsemi.com
8
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 14 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 joint.
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
5
°
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 14. Typical Solder Heating Profile
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NTQD6866R2G | 功能描述:MOSFET 20V 5.8A N-Channel RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| NTQD6968 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Power MOSFET 6.6 Amps, 20 Volts |
| NTQD6968N | 功能描述:MOSFET 20V 7A N-Channel RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| NTQD6968NR2 | 功能描述:MOSFET 20V 7A N-Channel RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| NTQD6968NR2G | 功能描述:MOSFET 20V 7A N-Channel RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
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