2023-06-01
441
In addition to the wiring on the substrate, the metal coating is the place where the substrate line and electronic component are welded. In addition, different metals also have different prices, and different ones will directly affect the cost of production. Different metals also have different weldability and contact, as well as different resistance values, which will directly affect the effectiveness of the component.
Common metal coatings include:
copper
tin
The thickness is usually 5 to 15 μm
Lead tin alloy (or tin copper alloy)
That is welded, the thickness is usually 5 to 25 μm, and the tin content is about 63%
gold
Generally only plated in the interface
silver
Generally, it is only placed in the interface, or the alloy of silver with the whole
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