请参考以下文件:



1.JEDEC/IPC-JP002 JEDEC/IPC Current Tin Whiskers Theory and Mitigation Practices Guideline



Scope:This document provides insight into the theory behind tin whisker formation as it is known today and, based on this knowledge, potential mitigation practices that may delay or prevent tin whisker formation. The potential effectiveness of various mitigation practices will also be briefly discussed. References behind each of the theories and mitigation practices are provided. Due to additional performance requirements, the mitigation methods in this document may not be sufficient for certain applications with special needs (e.g., military or aerospace).



2.JESD201 Environmental Acceptance Requirements for Tin Whisker Susceptibility of Tin and Tin Alloy Surface Finishes



3.JESD22A121 Measuring Whisker Growth on Tin and Tin Alloy Surface Finishes





Best regards,

张学良 Bliver Zhang

Technology Resources Coordinate 标准化协调

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发件人: TGAsia [[log in to unmask]] 代表 bo.xu [[log in to unmask]]

发送时间: 2012年2月9日 8:50

到: TGAsia

主题: [TGAsia] Tin Whisker锡须相关问题



大家好!

      我想咨询一下, IPC中是否有Tin Whisker锡须的相关资料?

包括锡须的形成, 生长速率与工艺和环境的相关关系, 锡须实验的实验要求, 实验条件, 样品数量, 后续改善方法等, 谢谢!



      现在我们需要做以下实验, 顺便请大家介绍下哪里可以做.



Tin Whisker Acceptance – 9 PWB assemblies are built up using production solder and attachment methods.

Assemblies need to be preconditioned and then inspected.

Assemblies are then split into three lots of three per JEDEC JESD201A table 4a.  Inspections need to be recorded with SEM inspection. Preconditioning is required.

Stress Test Conditions Inspection Interval Test Duration

Temp/Cycling -40 to 85 C with 10 minute soak 500 Cycles 1500 Cycles

Temp/Humidity 30 C / 60% RH 1000 hours 4000 hours

High Temp/Humidity 55 C / 85% RH 1000 hours 4000 hours

Pass/Fail Criteria: – Less then 10 whiskers per 25 mm2 area.  Maximum whisker length is shorter then the distance between any terminals on assemble.





2012-02-09

________________________________

Regards!



Bo Xu

工程技术部









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