Hi Lily,



 



XiaoPing Chen from Flex ever asked the same question. Please refer to the e-mail attached for the advice from David. 



Best Regards, 



George Liu 

Mobile: +86 159 7693 5620 

e-mail: [log in to unmask] 

"Creating Value that Increases Customer Competitiveness" 



________________________________



From: TGAsia [mailto:[log in to unmask]] On Behalf Of Lily Zhu

Sent: Tuesday, June 26, 2007 4:16 PM

To: [log in to unmask]

Subject: Re: [TGA] 答复: [TGA] DFM 请教



 



Hi ZJQ,



 



非常感谢你的帮忙! 请问这个DFM参数有没有具体的行业标准? 如果有相关的规范, 将能帮助我们和客户进行谈判. 



 



谢谢!



Lilyzhu



	----- Original Message ----- 



	From: Zhao Jingqing <mailto:[log in to unmask]>  



	To: [log in to unmask] 



	Sent: Tuesday, June 26, 2007 3:50 PM



	Subject: [TGA] 答复: [TGA] DFM 请教



	 



	

	根据经验，不同器件的引脚直径所需的PCB的孔径也不同，建议尺寸： 

	器件引脚直径D： D≦1.0mm       1.0mm＜D≦2.0mm       D＞2.0mm 

	PCB孔径d：            D＋0.3mm        D＋0.4mm                      D＋0.5mm 

	

	

	



 



Lily Zhu <[log in to unmask]> 

发件人： TGAsia <[log in to unmask]> 



2007-06-26 15:20 

请答复 给 Asia Committe Task Group Forum; 请答复 给 Lily Zhu 



        

        收件人：        [log in to unmask] 

        抄送：         

        主题：        [TGA] DFM 请教



	

	

	

	各位,

	

	请教一下, PCBA板中通孔的直径和安放在通孔里的元器件引脚的直径比例在一个怎样的范围比较好?

	

	现在遇到一个问题, 元件的引脚比较细, 过波峰焊后焊锡在通孔里爬升情况不好, 摇一摇元件身体部分, 引脚就会松动. 在更换了活性较强的助焊剂后, 情况不见好转. 

	

	欢迎各位大侠出谋划策, 谢谢!

	Lilyzhu 





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