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參數(shù)資料
| 型號(hào)： | PC8641MSH1333JB |
| 廠商： | E2V TECHNOLOGIES PLC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROPROCESSOR, CBGA1023 |
| 封裝： | 33 X 33 MM, 2.72 MM HEIGHT, 1 MM PITCH, ROHS COMPLIANT, CERAMIC, FC-BGA-1023 |
| 文件頁數(shù)： | 104/111頁 |
| 文件大小： | 1660K |
| 代理商： | PC8641MSH1333JB |
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92
0893C–HIREL–01/10
PC8641 and PC8641D [Preliminary]
e2v semiconductors SAS 2010
20.2.2
Thermal Interface Materials
A thermal interface material is recommended at the package-to-heat sink interface to minimize the ther-
mal contact resistance. Figure 20-4 shows the thermal performance of three thin-sheet thermal-interface
materials (silicone, graphite/oil, fluoroether oil), a bare joint, and a joint with thermal grease as a function
of contact pressure. As shown, the performance of these thermal interface materials improves with
increasing contact pressure. The use of thermal grease significantly reduces the interface thermal resis-
tance. That is, the bare joint results in a thermal resistance approximately seven times greater than the
thermal grease joint.
Often, heat sinks are attached to the package by means of a spring clip to holes in the printed-circuit
board (see Figure 20-1 on page 90). Therefore, synthetic grease offers the best thermal performance,
considering the low interface pressure, and is recommended due to the high power dissipation of the
PC8641. Of course, the selection of any thermal interface material depends on many factors—thermal
performance requirements, manufacturability, service temperature, dielectric properties, cost, and so on.
Figure 20-4. Thermal Performance of Select Thermal Interface Materials
20.2.3
Heat Sink Selection Example
The following section provides a heat sink selection example using one of the commercially available
heat sinks.
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
T
J = TI + TR + (R
θJC + RθINT + RθSA) × PD
where
TJ is the die-junction temperature
0
0.5
1
1.5
2
010
20
30
40
50
60
70
80
Silicone Sheet (0.006 in.)
Bare Joint
Floroether Oil Sheet (0.007 in.)
Graphite/Oil Sheet (0.005 in.)
Synthetic Grease
Contact Pressure (psi)
Specific
Ther
mal
Resistance
(K-in.
2
/W)
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