A PCB surface finish is a coating between a component and a bare board PCB. It is applied for two basic reasons: to ensure solderability, and to protect exposed copper circuitry. As there are many types of surface finishes, selecting the right one is no easy task, especially as surface mounts have become more complex and regulations such as RoHS and REACH have changed industry standards.
To select the optimal suface treatment, we will have to consider many factors like Lead vs. Lead free, Component Type, Cost, Reworkability, Productivity and Environment.
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