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本帖最后由 coolzerong 于 2009-5-13 13:16 编辑
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, v5 [) ]. q. F# Z2 b我记得Cadence教程里的PAD制作教程里有关于元件焊盘尺寸的规范7 R9 K/ b$ Y. K4 f
Hole size<40mil 的 DIAMETER=Hole size+12mil. s3 X; @1 W- F9 O7 u
40mil<Hole size<80mil 的 DIAMETER=Hole size+16mil. |9 w& o+ M" L6 p
80mil<Hole size 的 DIAMETER=Hole size+20mil
/ D" e5 A) `) y# e3 E+ T6 N孔径是成序列化的,<40mil的 按4mil递减,即36mil,32mil,28mil,24mil...........$ f" V2 s6 n( D% c
>40mil的 按5mil递增。即40mil,45mil,50mil,55mil...........' X) Y" {+ |1 G9 A5 R* E
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我想这也应该适合过孔的规范吧。 |
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