Main products: power adapter, medical power, LED power, charger and so on.
Shenzhen Lianyunda Electronics Co., Ltd. is committed to doing a good job in power supply products, and sincerely welcomes customers to contact us by phone or email.
The Unicom power adapter has strong compatibility, wide application range, high work efficiency, high cost performance, environmentally friendly wire, high quality material selection, stable output, long life and safety. Buy a power adapter and find Shenzhen Intermodal Electronics.
As ICs become more integrated, the IC pins are more dense. The vertical tin-spraying process is difficult to flatten the thinned pads, which makes the placement of the SMT difficult; in addition, the shelf life of the tin-plated board is very short. The gold plate just solves these problems:
1 For the surface mount process, especially for the 0603 and 0402 ultra-small surface mounts, since the flatness of the pad is directly related to the quality of the solder paste printing process, it has a decisive influence on the quality of the reflow soldering. Therefore, the whole plate is plated with gold. Common in high density and ultra small surface mount processes.
2 In the trial production stage, due to the factors such as component procurement, it is often not the board to be welded immediately, but it is often necessary to wait for a few weeks or even a month to use, the shelf life of the gold plate is better than the lead tin. Hehe. The gold is many times longer, so everyone is willing to adopt it. Besides, the cost of the gold-plated power adapter PCB in the sample phase is comparable to that of the lead-tin alloy plate.
In order to solve the above problems of the gold plate, the power adapter PCB using the Shenjin board has the following characteristics:
1. Because the crystal structure formed by Shenjin and gold plating is different, Shenjin will be golden yellow and more yellow than gold plating, and customers are more satisfied.
2. Because the crystal structure formed by immersion gold and gold plating is different, immersion gold is easier to weld than gold plating, which will not cause poor welding and cause customer complaints.
3. Because the gold plate has only nickel gold on the pad, the signal transmission in the skin effect is not affected by the signal in the copper layer.
4. Because of the gold plating, the crystal structure is denser and it is not easy to produce oxidation.
5, because the gold plate only has nickel gold on the pad, so it will not produce gold wire and cause it to be short.
6. Because the gold plate has only nickel gold on the pad, the solder joint on the line is more firmly bonded to the copper layer.
7. The project will not affect the spacing when making compensation.
8. Because the crystal structure formed by immersion gold and gold plating is different, the stress of the immersion gold plate is easier to control, and it is more conducive to the processing of bonding for the products with bonding. At the same time, because Shenjin is softer than gold plating, the gold plate is not wearable.
9. The flatness and standby life of the Shenjin plate are as good as the gold plate.