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| 型号： | STPCI2HEYI |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 外设及接口 |
| 英文描述： | MULTIFUNCTION PERIPHERAL, PBGA516 |
| 封装： | PLASTIC, BGA-516 |
| 文件页数： | 4/109页 |
| 文件大小： | 2430K |
| 代理商： | STPCI2HEYI |
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STPC ATLAS
Issue 1.1 - March 23, 2004
101/109
To avoid solder wicking over to the via pads during
soldering, it is important to have a solder mask of
4 mil around the pad (NSMD pad). This gives a
diameter of 33 mil for a 25 mil ground pad.
To obtain the optimum ground layout, place the
vias directly under the ball pads. In this case no
local board distortion is tolerated.
6.5.2.3. Heat dissipation
The thickness of the copper on PCB layers is
typically 34 m for external layers and 17 m for
internal
layers.
This
means
that
thermal
dissipation is not good; high board temperatures
are concentrated around the devices and these
fall quickly with increased distance.
Where possible, place a metal layer inside the
PCB; this improves dramatically the spread of
heat and hence the thermal dissipation of the
board.
The possibility of using the whole system box for
thermal dissipation is very useful in cases of high
internal
temperatures
and
low
outside
temperatures. Bottom side of the PBGA should be
thermally connected to the metal chassis in order
to propagate the heat flow through the metal.
Thermally connecting also the top side will
improve furthermore the heat dissipation. Figure
6-35 illustrates such an implementation.
Figure 6-34. Optimum Layout for Central Ground Ball - top layer
Via to Ground layer
Pad for ground ball
Clearance = 6mil
diameter = 25 mil
hole diameter = 14 mil
Solder mask
diameter = 33 mil
External diameter = 37 mil
connections = 10 mil
Figure 6-35. Use of Metal Plate for Thermal Dissipation
Metal planes
Thermal conductor
Board
Die
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相关代理商/技术参数 |
参数描述 |
|---|---|
| STPCINDUSTRIAL | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PC Compatible Embedded Microprocessor |
| STP-CN04 | 功能描述:烙铁 Cartridge Conical 0.4mm (0.016in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included |
| STP-CN05 | 功能描述:烙铁 Cartridge Conical 0.5mm (0.02in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included |
| STP-CN10 | 功能描述:烙铁 Cartridge Conical 1mm (0.039in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included |
| STP-CNB04 | 功能描述:烙铁 Cartridge Conical Bent 0.4mm (0.016in) RoHS:否 制造商:Weller 产品:Soldering Stations 类型:Digital, Iron, Stand, Cleaner 瓦特:50 W 最大温度:+ 850 F 电缆类型:US Cord Included |
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