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
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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



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