1.案例背景Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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2.分析方法简述Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
对样品进行外观观察,未发现明显异常。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·ÔÂ"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô 经X-RAY无损检测,未发现明显异常。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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通过C-SAM扫描发现了IC内部存在分层现象。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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图5.NG样品C-SAM图片Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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通过IV曲线测试,发现引脚间存在漏电通道。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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图6.NG样品IV曲线图Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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DE-CAP后,利用SEM/EDS进行分析,确认了引脚间存在银迁移问题。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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表1.开封后的NG样品内部EDS测试结果(Wt%)Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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3.结论Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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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。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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4.参考标准Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
GJB 548B-2005 微电子器件失效分析程序-方法5003。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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IPC-TM-650 2.1.1-2004手动微切片法。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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GB/T 17359-2012 电子探针和扫描电镜X射线能谱定量分析通则。Â"¤¦ÁÀÍ4gbbs.3c3t.com§×驲Óv·Ô
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