PCB circuit board proofing or board making requires a lot of information, and the difference in each item will have a huge impact on the final price. Size, board thickness, surface treatment, resistance resistance, solder mask coverage, solder mask color, gold finger, copper foil thickness, etc. Therefore, for the entire PCB link, the largest proportion under the same conditions for the entire cost is The surface process is processed, immersion gold, gold plating (these are all real gold and silver), so the circuit board recycling is the same as recycling gold and silver. How does it sound, go tall!
So the question is, why use immersion gold and gold plating? In fact, this is related to the current new technology. Now BGA/IC has a very high integration level, and BGA/IC has more and more pins.
However, the current vertical tin-spray process is difficult to blow into small pads very smoothly. If a big problem occurs in the initial stage, the subsequent production will be more difficult to solve. In particular, the mounting difficulty of SMT will be doubled; another key point is that the life cycle of the tin spray board is very short. And the entire manufacturing time will be doubled.
Therefore, what came into being is the use of metal plating to solve, the application of immersion gold and gold-plated plates:
1. For pcb pcba assembly manufacturing mounting process, especially the small surface mount process such as 0402/0201, because the flatness of the pad is directly related to the quality of the solder paste printing process. There is also reflow welding quality, if the quality of smt and DIP plug-in welding is problematic, the subsequent products are definitely bad batch.
2. The service life of immersion gold and gold-plated boards is relatively long. A pcb is produced and must be produced immediately, but it often has to wait for several weeks or even a month before it is used. The procurement of components during it takes time, and the PCB The storage also needs strict conditions to support. In terms of comprehensive cost, the prices of immersion gold, gold-plated and tinplate are similar, but the quality is more stable, why not do it!
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