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參數資料
| 型號： | AN610 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | PolarPAK Solder Joint Reliability Based on Thermal Fatigue IPC-9701 |
| 中文描述： | PolarPAK的焊點熱疲勞的可靠性基于IPC - 9701 |
| 文件頁數： | 3/17頁 |
| 文件大?。?/td> | 1211K |
| 代理商： | AN610 |
Vishay Siliconix
AN610
Document Number 73507
31-Aug-05
www.vishay.com
3
One PCB can accommodate eight PolarPAK pack-
ages (see Figure 6). Appendix B covers PCB fabrica-
tion details.
PCBA characteristics:
Surface finish: Immersion silver
Board thickness: 3.175 mm [0.125 in.]
Board size: 4.5 in. by 5 in.
Each PCB side is designed to accommodate two
types of parts. PCB Part #SMDTF125T16L_Ver C
accommodates PolarPAK and PowerPAK SO-8 sin-
gle ext.
b) PCB assembly: The test sample build was deter-
mined by IPC-9701, which calls for 32 fresh and 10
reworked solder joint assemblies. Seven boards with
seven parts on each board gives 49 assembled
parts. Reworking two parts from six boards renders
12 reworked parts. Five boards from the reworked
group and a seventh non-reworked board for temper-
ature cycling were used to meet IPC-9701 criteria.
The sixth reworked board was retained as a zero
temperature cycle reference board.
Using the PCB assembly process developed and
described in AppNote AN-xxx titled "Development of
Lead-free soldering profile for PolarPAK"
[2]
seven
PCBs were assembled with seven PolarPAK parts
on each board. Part ID U16 was not assembled.
Assembly process parameters:
a. Stencil aperture opening: Increase of 10% -- the
aperture increase from the original pad size was
used
b. Aperture shape and size, stencil thickness, and
aspect ratio are described in the following table:
Aspect ratio (aperture opening / stencil thickness) =
2.5
Minimum area ratio (LxW / 2(L+W)T) = 0.8
Solder pastes: The following solder paste was used:
Lead-free solder paste SAC-387 (Tamura TLF-206-
93G)
1. Stencil printing:
Machine: EKRA E5
Squeegee size / angle: 450 mm / 60°
Front/rear pressure: 40 Newtons
Print speed: 8-12 mm/s
Snap off: 0 mm
Separation speed: 0.5 mm/s
Stencil thickness: 5 mils
Stencil opening: See Table 1 below
Figure: 6 PCB Dimensions
Version
Aperture shape
Aperture
opening
Stencil thickness
(mil)
Aspect ratio
Area ratio
Component
shape
POLARPAK
Width (mils)
Length (mils)
CA
Rectangle
25.2
189.2
5
5.04
2.22
CA
Rectangle
21.0
189.2
5
4.20
1.89
CA
Rectangle
94.5
189.2
5
18.90
6.30
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