PCB Technical - What are the advantages and disadvantages of tin spraying circuit boards?

Tin spraying is a step and process flow in the production process of PCB board. Specifically, the PCB board is immersed in a molten solder pool, so that all exposed copper surfaces will be covered by solder, and then the hot air cutter is used to remove Remove the excess solder on the PCB board. Because the surface of the circuit board after tin spraying is the same substance as the solder paste, the soldering strength and reliability are better. Let's talk about the advantages and disadvantages of tin spraying and its application fields in detail.

Advantages and disadvantages of tin spraying circuit board

Advantages of tin spraying:
1. The wettability is better during the soldering process of the components, and the soldering is easier.

2, it can prevent the exposed copper surface from being corroded or oxidized.

Disadvantages of tin spraying:
is not suitable for soldering pins with fine gaps and components that are too small, because the surface flatness of the spray tin plate is poor. Solder bead is prone to be produced in PCB manufacturer's processing, and it is easier to cause short circuit to fine pitch components.

When used in the double-sided SMT process, because the second side has undergone a high-temperature reflow soldering, it is very easy to spray tin and re-melt, resulting in tin beads or similar droplets that are affected by gravity into spherical tin dots, which make the surface even worse. Leveling affects welding problems.

With the advancement of technology, some circuit board proofing uses OSP process and gold immersion process instead of spraying tin process; technological development has also made some factories adopt tin and silver immersion process, and in recent years, the trend of lead-free. The use of tin spraying process is further restricted.

Spray tin plate application field Tin spray board is a common type of PCB board, generally a multi-layer high-precision PCB board, which is widely used in various electronic equipment, communication products, computers, medical equipment, aerospace and other fields and products.

ipcb is a PCB manufacturer with leading technology as its core competition. As the speed of digital circuits continues to increase, transient changes in voltage and current produce a large number of high-frequency components. When the bandwidth reaches more than 5Gbps, factors such as line width, copper foil roughness, outer surface treatment, copper thickness and other factors will significantly affect the conductor loss, placing higher requirements on the PCB manufacturer's processing technology. Due to the huge amount of information processing in high-speed circuits, the number of high-speed module PCB boards can reach 40 layers, which is the field where the demand for multi-layer boards is the most. ipcb company has mature high-frequency/high-speed board processing technology, ipcb company samples up to 100 layers, since 2014, ipcb company's high-speed board and special board purchases have accounted for more than 50% of the purchase of copper clad laminates. The package substrate accounts for about 38% of the cost of packaging and testing. The technical indicators are at the leading level in the industry. ipcb took the lead in building China's first industry 4.0 PCB smart factory, with a significant increase in production capacity, leading the Chinese PCB industry, achieving a net profit margin of more than 15%, and a per capita annual output value of 2 million yuan.

At present, there are more than 2,000 PCB manufacturers in the world, the industry structure is scattered, and there are many small factories, but the trend of large-scale and centralized is increasingly obvious. This development trend is due to the large demand for funds, high technical requirements and fierce competition in the industry on the one hand, and the increasing concentration of downstream terminal brands on the other hand. At present, there are about 1,500 PCB companies in mainland China, which are mainly distributed in areas with high concentration of electronics industries such as the Pearl River Delta, Yangtze River Delta and Bohai Rim, large demand for basic components, and good transportation and water and electricity conditions. IPCB Circuit Co., Ltd. is a well-known PCB manufacturer that meets customers' PCB purchasing needs.

Generally, PCB buyers choose a targeted PCB manufacturer based on the overall needs of the factory when choosing a PCB manufacturer. Professional PCB manufacturers produce PCBs with more quality assurance and after-sales service. Therefore, PCB buyers will choose PCB manufacturers with strong production and service capabilities to reduce the overall PCB procurement risk. For PCB buyers, it is not easy to find a suitable PCB manufacturer, so how to choose a PCB manufacturer?