The difference of pcb materialsTake the ordinary double-sided board as an example.The sheet materials are generally fr-4, cem-3, etc.The thickness of the sheet varies from 0.2mm to 3.0mm, and the thickness of copper varies from 0.5oz to 3oz.All of these are based on the sheet material.This has caused a huge price difference; in terms of solder mask ink, there is also a certain price difference between ordinary thermosetting oil and photosensitive green oil, so the difference in materials has caused the price diversity.The difference in pcb production processDifferent production processes will cause different costs.Such as gold-plated and tin-sprayed boards, the production of gongs (milling) boards and beer (punching) boards, as well as a series of special processing such as gold fingers, buried blind holes, etc., the use of silk screen lines and dry film lines will make a difference The cost, leading to price diversity.PCB itself is different in difficultyEven if the materials are the same and the process is the same, the difficulty of the PCB itself will cause different costs.
As PCB design is more and more commonly used with existing development boards, and daughter boards are used to drive hydraulic devices and servo motors or perform tasks based on light, motion, and sound, the trend of PCB design gradually tends to open source hardware models and Control System.After completing the product and printed circuit board design, you need to start building prototypes before mass production of PCBs.Several PCB design software packages, such as printed circuit board layout design tools and individual design tools, have simulation capabilities.Doing so can minimize the number of design errors before building the main PCB prototype.If you are designing a complex project, you may need to consider a modular design in which all the main functions are located in separate modules.Rotating a single module is faster and more efficient than rotating the entire design.All of this depends on the complexity of the design, and you can consider manually installing printed circuit board components to save costs.Therefore, it makes sense to consider PCB manufacturers for assembly.When running a small number of production runs, the cost of the production step will usually dominate the total construction cost.When looking for subcontractors, it is best to choose a supplier who specializes in PCB prototype manufacturing to minimize costs.
Expired PCB may cause oxidation of the solder pad on the PCB surfaceOxidation of the soldering pad will cause poor soldering, which may eventually lead to the failure of the PCB function or the risk of dropping parts.Different surface treatments of circuit boards will have different anti-oxidation effects.In principle, ENIG requires it to be used up within 12 months, while OSP requires it to be used up within six months.It is recommended to follow the shelf life of the PCB board factory.OSP boards can generally be sent back to the board factory to wash off the OSP film and re-apply a new layer of OSP, but there is a chance that the copper foil circuit will be damaged when the OSP is removed by pickling, so it is best to contact the board factory to confirm whether the OSP film can be reprocessed.ENIG boards cannot be reprocessed.
In recent years, resin plug holes have become very popular in the PCB industry and have a wide range of applications.Especially some products with high layers and thick boards have a higher use rate of resin plug holes.In order to solve this problem, many pcb engineers have put in research efforts until the 1990s, a Japanese pcb manufacturer invented resin, which can plug this kind of hole, and then plate copper on the surface, which can solve the problem of blowing in the hole caused by the green oil plug hole.However, the technology promotion at that time was not as rapid as it is now, it is only in recent years that China has started to use resin plugging to operate.The production process of different resin plug products is different, such as POFV type products, the process is cutting drilling-electroplating-plug hole-baking-grinding-electroplating-outer circuit-solder mask-surface treatment-molding Shipment, etc.; and the production of inner resin plugged products is divided into two types: grinding and non-grinding.The processes of the two are basically the same, but there will be some differences in the details.There are some special places in the resin plugging process, such as drilling through holes and sinking copper boards, which are generally considered to be POFV products, but if it is an inner layer pattern, it is an HDI resin plugging product, and different types of product processes are very strict You can’t go wrong with the definition standard, otherwise it will be extremely prone to problems.In terms of resin plugging process improvement, in order to reduce the scrap rate of inner HDI plugging products, designers will adopt the mode of plugging after the line.
Green is more convenient for pcb production
Compared with other colors, the green series has better characteristics, especially the green plug hole characteristics.
It may be better to realize the plug hole in the IC Test Board design.
Since green is the mainstream color in the production process, the purchase amount of natural green paint will be larger, and it can be concluded that the purchase cost of green paint will be lower than other colors.
At the same time, the use of the same color paint in mass production can reduce the replacement cost.
During the process, there are several processes to go through the yellow light room, and the green PCB board has the best visual effect in the yellow light room;
Secondly, in the SMT patch processing, the steps of tinning, patching and AOI verification all require optical positioning calibration, and the green bottom plate is more friendly when it is recognized by the instrument;
Factors of increasing the value of automotive PCBIn recent years, the trend of automobile electrification and electronics has become more and more obvious.As the backbone of electronic products, the importance of PCB manufacturing in the automotive supply chain is also increasing day by day.Compared with traditional fuel vehicles, the addition of charging, energy storage, power distribution and voltage conversion equipment for new energy vehicles will bring a large number of new application scenarios to PCBs.At the same time, although autonomous driving above L4 cannot be mass-produced in a short time, the gradual penetration of a variety of intelligent driving components will bring rapid development opportunities for the application of high-end high-frequency PCBs in automobiles.According to calculations by relevant departments, only in the powertrain and transmission fields, the value of PCBs on electric vehicles is as high as about RMB 800 per bicycle, which is 20 times the value of PCBs in this field of traditional vehicles.The new demand for electric vehicles mainly comes from powertrain related equipment-on-board chargers, battery management systems (BMS), voltage conversion systems (DC-DC, inverters, etc.)and other high-voltage and low-voltage devices.Factors of increasing automotive PCB productionA large number of high-voltage and high-power devices contained in new energy vehicles, such as IGBTs and MOSFETs, have high requirements for heat dissipation, which makes the layout of PCBs not too dense, which further increases the amount of PCBs for new energy vehicles.On each new energy vehicle, the total PCB board required for the above-mentioned equipment alone amounts to about 0.8 square meters.However, the total PCB required for a medium-level electronic fuel vehicle is only about 0.43 square meters.In the internal combustion engine and traditional system of traditional fuel vehicles, the amount of PCB used is very small, only about 0.04 square meters in total, which has greatly increased the output of automotive PCB.According to calculations by relevant departments, the PCB consumption of new energy vehicles equipped with millimeter-wave radar and large central control screens will reach 1.24 square meters, worth 1281 yuan, which is 3.6 times that of traditional fuel vehicles without the above configuration.Factors contributing to the considerable growth rate of China's pcb marketThe production and sales of China's new energy passenger vehicles will continue to grow rapidly in the next few years, and the CAGR is expected to be around 40% in 2018-2025.The domestic new energy passenger vehicle sales exceeded 1 million in 2018, and it is expected to exceed 2.5 million by 2020, and close to 12 million by 2025, with a market share of more than 40%.Major domestic PCB manufacturers have a relatively complete layout in the fields of automotive infotainment, lighting, powertrain and chassis (steering and braking).It is estimated that by 2025, the global automotive PCB market will reach 58.3 billion yuan, and China is expected to reach 40 billion yuan.