|
meixinjiance
- 技术员
- 26
- 78
- 2015-03-11
|
1#
t
T
发表于 2015-03-18 11:35
|只看楼主
1.案例背景' ²A8bbs.3c3t.com,Fm:Â@*
某功能模块在用户端出现功能失效，经返厂检修，发现该模块上的一片IC输出异常，经更换IC后，功能模块恢复正常。' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
2.分析方法简述' ²A8bbs.3c3t.com,Fm:Â@*
对样品进行外观观察，未发现明显异常。' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*' ²A8bbs.3c3t.com,Fm:Â@* 经X-RAY无损检测，未发现明显异常。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
.jpg) ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
通过C-SAM扫描发现了IC内部存在分层现象。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
 ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
图5.NG样品C-SAM图片' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
通过IV曲线测试，发现引脚间存在漏电通道。' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
 ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
图6.NG样品IV曲线图' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
DE-CAP后，利用SEM/EDS进行分析，确认了引脚间存在银迁移问题。' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
 ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
表1.开封后的NG样品内部EDS测试结果(Wt%)' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
 ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
3.结论' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
IC内部存在分层，由于水汽的入侵，加上集成电路各引脚之间存在电位差，导致了引脚间的银迁移，从而在引脚间形成微导通电路，致IC输出异常。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
4.参考标准' ²A8bbs.3c3t.com,Fm:Â@*
GJB 548B-2005 微电子器件失效分析程序-方法5003。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
IPC-TM-650 2.1.1-2004手动微切片法。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
GB/T 17359-2012 电子探针和扫描电镜X射线能谱定量分析通则。' ²A8bbs.3c3t.com,Fm:Â@* ' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
' ²A8bbs.3c3t.com,Fm:Â@*
|
%20(2)_1.gif)
