IAg or Immersion Silver Plating is a surface plating technology used for Printed Circuit Boards. It consists of a thin immersion silver plating over the copper traces.
Advantages of immersion silver:
Excellent surface planarity (compared to e.g. HASL)
Low High Frequency Signal loss due to skin effect
Disadvantages of immersion silver:
Rapid degradation of surface due to oxidation or contamination (with e.g. sulfur or chlorine)
Silver "whiskers" form across electrical potentials and short out components.
Baggio WANG
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