Hi Luxz: 您的PCB表面处理是什么?OSP?沉银?化金?镀硬金?喷锡? 不同的表面处理有不同的储存来源。IPC-1601 对PCB 的存储有一些定义, 可以参考。 另外,CPCA_1201对PCB的存储有定义。 IC加热就好,建议在发现不良后先使用SEM进行检测,看看零件内部有没有 裂缝的存在。在检查功能失效的pin脚的焊点是否存在IMC层, Thanks and Best Regards Sonic Lu 陆尚 Process Engineer Autoliv Electronics China (ACE) Co.,Ltd Tel: +86-21-67109300-3162 luxz <[log in to unmask]> Sent by: TGAsia <[log in to unmask]> 2011-11-23 17:21 Please respond to Asia Committe Task Group Forum <[log in to unmask]>; Please respond to luxz <[log in to unmask]> To <[log in to unmask]> cc Subject [TGAsia] 有关PCB保存期限与IC issue的请教 Dear All, 请教各位两个问题: 1. 一般电脑主板用的多层板保存期限为多长?哪份国标上会有定义? 注:原厂一般建议从包装日期开始不要超过半年,但客人再问定义半年的 依据是啥? 2.目前我司产线在IC使用过程中,有不少issue的IC一开始不良,但受热拆 解后不良消失,也就是说经过加热后,有的不良现象就消失了,请问各位高手,类似 该类现象,IC一般有哪些不良原因造成? 以上请各位高手协助回复。感谢! Best Regards! Eric.Lu ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ *************************************************************** Consider the environment before printing this message. To read Autoliv's Information and Confidentiality Notice, follow this link: http://www.autoliv.com/disclaimer.html *************************************************************** ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________