Why to do Mixed surface treatment?

Why to do Mixed surface treatment? ------ The relation with gold thickness and SMT First of all, let's take a look at this example of case,the context is that there was a project with BGA balls,but the BGA balls were peeled off in the thermal shock.We reviewed all production records and inspection results and excluded the possibility of everything except the reason of gold thickness.The good thickness for this project is 3u"(0.0762um). I think you must be curious about this conclusion,why the gold thickness? From the standpoint of a manufacturer,we often find some customer defined mixed surface finish (ENIG + OSP),ENIG for the exposed copper pads(but BGA area),OSP for BGA balls. Why are the customer defining mixed surface finish? The reason is to avoid BGA balls peel off from the base material. The thicker gold thickness the more time spend of gold melted when we do PCB assembly.We can reduce...

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How to lower the risk of PCB design?

If we could know the possible risks ahead of the PCB design,the risks will be avoided in advance,the success rate of PCB design will be improved greatly. Many companies have set an index to check the success rate of the first article,the key point of the successful first article is signal integrity design. But a lot of the enterprises faced some problems in the PCB design.The completed PCB work in fluctuation situation or don't work at all. In the next,I will share with you three tips for reducing the risks when you design PCB. Firstly,considering the issues of signal integrity before you start to design.You should think about how to bluid a whole system,how to ensure the signal transmiting from one model to another model. Secondly,using the simulation software to evaluate the layout type,to survey whether the signal quality could meet the requirements. Finally,the risk control should be through out of the PCB design,slove...

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Castellated Hole PCB

The higher level of plated edges is the so called half-hole technology for printed circuits, also named as Castellations PCB or Castellated-Hole-PCB . Plated drills are cut in half on the outline of the PCB so that the shape appears like a stamp. Sounds simple but requires multiple additional  processes and careful production planning during the CAM layout preparation. More and more often plated slots, plated edges or even completely plated outlines are required for printed circuit boards. While plated slots are relatively easy to produce, plated slots already require more planning and layout preparation prior to manufacturing. An even higher level of sophistication is reached by half-hole printed circuits board edges, where half of the plated drill is cut open. One may think that half-holes are a simple process flow of drilling, plating and cutting (routing) them in half. However, what will be happening is that the plated copper wall breaks...

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The veteran’s answer about Crystal Oscillator (Part two)

USB1.1 needs 48MHz clock to be divided, so 12MHz crystal oscillator is required, and the frequency is 4 times that of 48MHz. Why don't choose 48MHz Crystal Oscillator directly? Because high frequency crystal oscillator is easy to be affected by peripheral circuits or affect peripheral circuits. Most of the time,we get high frequency by using low frequency crystal oscillator with second harmonic generation. But it's not absolute,many circuits is often used a crystal oscillator of 50M or more. That's a key point that we need a special attention when we do PCB layout.   Why we use 32.768KHz crystal oscillator when the RTC clock needs a more accurate 1S (1 second)? Because all digital circuits are expressed by binary system,32768 is 1000000000000000 in binary system. So as long as we detect the highest bit changes, we will know that 1 second, don't need to check every bit, the circuit is more simple.   Does the clock...

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The veteran’s answer about Crystal Oscillator (Part one)

Someone who has just started to join in Electronic Industry,they often faced the questions about Crystal Oscillator,even they have researched a lot of resources from refernce books or internet,but many of them are still in confusion. Today I share with you some typical questions and answers from the veteran electronic engineer. What's the fonction of Crystal Oscillator? The main fonction is providing a clock signal for the whole system. For example,the run model of CPU is step by step,every step defined an instruction that base on Crystal Oscillator. What's the relation between Crystal Oscillator and timing sequence? Timing sequence is counted on the clock's order,and the clock is generated by a Crystal Oscillator. Why we often set some different Crystal Oscillator on the same PCB? Evey different CPU or Chip has different frequencies,they need matched Crystal Oscillator to run. For example,USB1.1 needs 48MHz clock to be divided, so 12MHz crystal oscillator is required, and...

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Why PCB Design Software is Proving So Vital to Modern Circuit Board Ingenuity

Printed circuit board (PCB) design software is a remarkable tool when it comes to designing PCB for electronic devices. By using the PCB design software, an engineer not only addresses issues associated with power integrity and signal, but is also able to modify and improve the entire circuit structure. PCB design software can be easily integrated with other associated plugin PLM software that can assist engineers to better analyze layouts and designs of PCBs. In recent years, the demand for PCB design software from the electronics manufacturing industry has been robust. According to the latest data released by Future Market Insights (FMI), the global market for PCB design software is set to witness a CAGR of more than 12% between 2016 and 2026 to rake in $4,755.1 million in revenues by the end of the forecast period. Needless to say, PCB design software eliminates issues faster and significantly reduces circuit board...

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The advantage of robot in PCB industry

The advantage of robot in PCB industry Like the automobile industry and other manufacturing industries, industrial robots have brought many advantages to enterprises in the PCB industry. 1.Reduce the use of work, speed up the pace of work, improve work efficiency. 2.Improve operation precision and product quality. 3.To avoid the potential threat to the health and safety of workers from the operating environment and save the investment in environmental safety. 4.Reduce the loss of efficiency, quality and accident rate caused by repeated and boring processes on the state of workers. 5.Optimize job flow and reduce job space. 6.Effectively reduce the material consumption rate. 7.Can operate continuously for 24 hours and in the environment of black lights. 8.Promotion of brand image and reputation. The application of industrial robots make PCB manufacturer to further enhance the automation level, promoting product quality, production efficiency, cost control, progress of response ability, improve the whole competition strength of the manufacturers in the industry....

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What is wave soldering?

Wave soldering is to make the solder side of the PCB directly contact with high temperature liquid tin for welding purposes,its high temperature liquid tin maintains an inclined surface, and a special device makes liquid tin form a wavy phenomenon, so it is called "wave soldering",its main material is soldering tin bar. Wave soldering is currently the most commonly used and effective method, wave soldering system has a large enough tin can handle the maximum circuit board width you expect.Wave soldering is suitable for medium batch or large quantity welding. Advantage: The rate of return is high, the whole welding process is controllable, repeatable, the operator can be on the job after simple training. Defect: The cost of wave-soldering system is higher than other welding methods, but the welding cost of each circuit board is the lowest, and the wave-soldering system occupies a large space in the workshop....

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