Shocking PCB design cases about crystal oscillators

yvonneGan

Shocking PCB design cases about crystal oscillators [Copy link]

Yibo Expressway Member: Wang Huidong

There is a magical PCB design software. When outputting gerber, if there is no special setting, all the vias on the board will have windows.

Are the vias below what you originally wanted?

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As we all know, opening vias is not conducive to the later soldering of PCBs, and it is particularly easy to cause tin short circuits. Therefore, experienced MI engineers in factories usually send project confirmations to customers, suggesting deleting the via openings and plugging them.

The factory then issued a project confirmation, suggesting that the vias of the following sizes should have their windows deleted and be plugged with solder mask.

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Maomao’s reply was very simple, just two words - agree.

The following figure shows the types and sizes of vias within the board.

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As the wheel of time rolled forward, the production line worked day and night and finally handed the board to Maomao.

Maomao took the board and ran to Factory E to weld it.

Company E is a big brand with new equipment, strong technology, fast delivery, first-class service and guaranteed quality.

The preliminary preparations went smoothly.

When the materials arrived at IQC, Maomao felt there was no problem and hurried back.

Go to bed early and come to get the board early tomorrow morning. This project is so rushed.

The world was especially quiet after midnight. Maomao was sleeping when the sudden ringing of the phone woke him up.

The factory's PMC, the ever-smiling Rao Xiaoxiao, called and told Maomao that there was a problem with the passive crystal oscillator material and it could not be assembled into the hole.

I also sent a picture to Maomao.

When Maomao saw the picture, he felt confused. This...

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There is no window for the solder mask on the PCB, and green oil is stuffed into the hole, which makes it impossible to plug in the plug-in hole. Now the workshop has stopped the production line, and Xiaoxiao asked Maomao what to do next.

Maomao said to wait a moment and then called the engineer at the PCB factory.

The factory engineer said that I suggested that you delete all the vias on the board and make them plugged. The diameter of this component hole and other vias on the board are both 0.4mm. Next time, if it is a component hole, please distinguish it from the via hole diameter.

Maomao was speechless. He sighed and called Xiaoxiao.

Please help scrape off the ink on the board to see if the flying lines can be processed.

Maomao said that others go into the night sea to salvage the lost stars, but I go to look for troubles and frustrations.

The final result was good. Rao Xiaoxiao played with a throwing knife under the shadowless lamp, scraped off the green oil and applied solder paste, and finally repaired Maomao's board.

Maomao looked at Xiaoxiao's red eyes and secretly swore in his heart that he must design the board well.

Time rises and falls like the tide, recording the joys and sorrows of life, and of course, sweetness and happiness.

Maomao was going to vote again soon. He remembered the lesson from last time and must not let Xiaoxiao miss the target again.

This time he still had a crystal oscillator on his board, and he made a special design for the package.

The gerber is still the same, and the plug-in hole still has a window. Even if the factory accidentally deletes it this time, there is no need to worry about the crystal oscillator not being able to be soldered.

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Maomao wants to laugh when he sees his PCB design, because that is the fuel for his happiness.

History always has surprising similarities.

It was also a night like that, and also before dawn.

It’s Xiaoxiao’s phone, and the components can’t be soldered either.

Maomao was really furious this time.

The crystal oscillator is known as the heart of electronic equipment. It is the most commonly used and indispensable component in electronic products and cannot always go wrong.

Why does crystal oscillator always shock people?

Xiaoxiao sent another picture.

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Maomao said that my package design has a signal pad and grounding, and he is very satisfied with all aspects of the design.

You wouldn't be calling me just because you see me sleeping soundly in the middle of the night to make me lose sleep or panic.

Xiaoxiao said there is no problem with the PCB design, but please check whether the materials provided are incorrect.

Plug-in crystal oscillator, PCB design into SMD pad.

The first device cannot be mounted because there is no place for the placement machine's nozzle to hold it.

The second most critical thing is that your device cannot withstand the high temperature of reflow soldering. It is fine when it goes in, but melted when it comes out.

What? Maomao almost dropped his jaw in shock.

After a long time, Maomao asked quietly what to do.

Xiaoxiao said hand welding.

— end —

Questions for this issue

Regarding PCB crystal oscillator design, have you developed any new cases? Come on, tell us about your unhappy things and make everyone happy.

yan9848

Awesome

秦天qintian0303

Each SMT process will cause permanent damage to the crystal oscillator.

zhaoyanhao

This kind of case explanation is really great, combining professionalism, literary quality and fun. I want to know whether this kind of copywriting is written by a special writing department or by engineers in their spare time.

吾妻思萌

Hahahaha, if you plug it in directly, you have to solder it, but it may be due to a shortage of stock, there is no other way.

led2015

By placing a plug (usually a cylindrical filler of the same material) into the through hole to seal it, the molten tin during the tinning process can be prevented from flowing into the inner or outer conductive layer. In this way, problems such as tin short circuits are less likely to occur during the soldering process.

Shocking PCB design cases about crystal oscillators [Copy link]

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