What is PCB migration poblem ?

 

■.What is PCB migration problem ?

 

 - Migration is narrow space short problem in high temperature and humid. It is abbreviated as ECM (Electrochemical migration)

 

■.Why occur migration ?

 - In Electrolyte, apply power to both metal. Electrical potential is difference and move electron move from the positive electrode to the negative electrode, and the ions of the electrode carry the metal ions along the electrolyte.

 - High temperature and humid condition is like electrolyte. So 

  

■.How to prevent migration problem ?

 - Design by High voltage line.

 - Dehumid control for defend Ion transport.

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Reference : [1] IPC/ANSI J - STD - 001D, U Requirements for Soldered Electrical and Electronic Assemblies U , February 2005.