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参数资料
| 型号： | ESDA8V2-1MX2 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, DSO2 |
| 封装： | ROHS COMPLIANT, QFN-2 |
| 文件页数： | 9/10页 |
| 文件大小： | 252K |
| 代理商： | ESDA8V2-1MX2 |
Recommendation on PCB assembly
ESDA8V2-1MX2
8/10
4.2
Solder paste
1.
Halide-free flux qualification ROL0 according to ANSI/J-STD-004.
2.
“No clean” solder paste is recommended.
3.
Offers a high tack force to resist component movement during high speed
4.
Solder paste with fine particles: powder particle size is 20-45 m.
4.3
Placement
1.
Manual positioning is not recommended.
2.
It is recommended to use the lead recognition capabilities of the placement system, not
the outline centering
3.
Standard tolerance of ± 0.05 mm is recommended.
4.
3.5 N placement force is recommended. Too much placement force can lead to
squeezed out solder paste and cause solder joints to short. Too low placement force
can lead to insufficient contact between package and solder paste that could cause
open solder joints or badly centered packages.
5.
To improve the package placement accuracy, a bottom side optical control should be
performed with a high resolution tool.
6.
For assembly, a perfect supporting of the PCB (all the more on flexible PCB) is
recommended during solder paste printing, pick and place and reflow soldering by
using optimized tools.
4.4
PCB design preference
1.
To control the solder paste amount, the closed via is recommended instead of open
vias.
2.
The position of tracks and open vias in the solder area should be well balanced. The
symmetrical layout is recommended, in case any tilt phenomena caused by
asymmetrical solder paste amount due to the solder flow away.
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