參數(shù)資料
型號: MPC7410RX400NE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, RISC PROCESSOR, CBGA360
封裝: 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360
文件頁數(shù): 38/73頁
文件大小: 929K
代理商: MPC7410RX400NE
MOTOROLA
MPC7410 RISC Microprocessor Hardware Specications
43
System Design Information
Assuming an air velocity of 0.5 m/s, we have an effective Rsa of 7°C/W, thus
Tj = 30°C + 5°C + (0.03°C/W + 1.0°C/W + 7°C/W) × 5.0 W,
resulting in a die-junction temperature of approximately 75°C which is well within the maximum operating
temperature of the component.
Other heat sinks offered by Aavid Thermalloy, Alpha Novatech, The Bergquist Company, IERC, Chip
Coolers, and Wakeeld Engineering offer different heat sink-to-ambient thermal resistances, and may or
may not need airow.
Figure 26. Thermalloy #2328B Heat Sink-to-Ambient Thermal Resistance Versus Airow Velocity
Though the die junction-to-ambient and the heat sink-to-ambient thermal resistances are a common
gure-of-merit used for comparing the thermal performance of various microelectronic packaging
technologies, one should exercise caution when only using this metric in determining thermal management
because no single parameter can adequately describe three-dimensional heat ow. The nal die-junction
operating temperature, is not only a function of the component-level thermal resistance, but the system-level
design and its operating conditions. In addition to the component's power consumption, a number of factors
affect the nal operating die-junction temperature—airow, board population (local heat ux of adjacent
components), heat sink efciency, heat sink attach, heat sink placement, next-level interconnect technology,
system air temperature rise, altitude, etc.
Due to the complexity and the many variations of system-level boundary conditions for today's
microelectronic equipment, the combined effects of the heat transfer mechanisms (radiation, convection,
and conduction) may vary widely. For these reasons, we recommend using conjugate heat transfer models
for the board, as well as, system-level designs.
1
3
5
7
8
0
0.5
1
1.5
2
2.5
3
3.5
Thermalloy #2328B Pin-Fin Heat Sink
Approach Air Velocity (m/s)
Heat
Sink
Ther
mal
Resistance
(C/W)
(25
× 28 × 15 mm)
2
4
6
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