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AN3338 bảng dữ liệu(PDF) 67 Page - STMicroelectronics

tên linh kiện AN3338
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN3338 bảng dữ liệu(HTML) 67 Page - STMicroelectronics

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AN3338
Design and mounting guidelines
72
5.2.2
Mounting torque
While mounting the SLLIMM to a heatsink make sure not to apply excessive force during the
assembly.
Table 14 provides the specified fastening torque. Inappropriate mounting can
damage the device and over tightening the screws may cause DBC substrate or molding
compound cracks. Avoid mechanical stress due to tightening on one side only. It is
recommended to temporarily fasten both screws, then fasten them permanently to the
specified torque value using a torque wrench.
Figure 47 shows the screw fastening order.
Figure 45. Recommended silicon grease thickness and positioning
Heatsink
100~200 m
thickness
SLLIMM
Table 14. Mounting torque and heatsink flatness
Parameter
Limits
Units
Min.
Typ.
Max.
Mounting torque (M3 screw)
0.4
0.7
1.0
Nm
Heatsink flatness
-50
150
µm
SDIP-25L package weight
13
g
SDIP-38L package weight
17
g



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