source:Other information release time:2023-03-17 Hits: Popular:PCB Assembly company
One: Golding the whole plate
Generally refers to [electroplating] [electroplating nickel gold board], [electrolyte], [electric gold], [electric nickel gold board], there are soft gold and hard gold (generally used as gold finger). The principle is to dissolve nickel and gold (commonly known as gold salt) in chemical potion, immerse the circuit board in the electroplating cylinder and pass the current, and generate nickel gold plating on the copper foil surface of the circuit board. High hardness, abrasion resistance, and not easy to oxidize are widely used in electronic product names.
Two: Shen Jin
A layer of plating layer is generated through the method of chemical oxidation reaction. Generally, the thickness of the chemical nickel gold layer deposition method can be achieved. It can reach a thick gold layer, which is usually called Shen Jin.
Three: Gold -plated board
As IC's integration becomes higher and higher, the more IC's feet, the closer. The vertical tin spray process is difficult to flatten the pads of the thin, which brings difficulty to the SMT's paste; in addition, the desklife life of the tinboard plate is short. The gold -plated board just solves these problems: 1 For surface stickers, especially for 0603 and 0402 ultra -small table stickers, because the flatness of the pads is directly related to the quality of the tin paste printing process. By the decisive impact, the whole plate is often seen in high -density and ultra -small watch stickers. 2 During the trial stages, the influence of factors such as component procurement is often not welded immediately when the board comes, but often wait for a few weeks or even a month to use it. There are many more than the alloy so everyone is willing to use it. Besides, the cost of gold -plated PCB is almost the same as that of lead -tin alloy boards.
But as the wiring becomes more and more dense, the width and spacing have reached 3-4mil. Therefore, the problem of short -circuit gold silk:
As the frequency of the signal becomes higher and higher, the impact of the situation of transmission transmission in a multi -plated layer due to the skin tendency effect, the more obvious the impact of the signal quality:
The skin tendency effect refers to: high -frequency AC power, the current will be concentrated on the surface of the wire.
According to calculations, the deepening depth of the skin is related to the frequency:
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