How to decided a trace width?

A few gerber that we recieved,the trace width was not enough to build,many engineers unsure how to set up the trace width. Width is regularly decided by the current signal carries,for a minimum width RCYPCB would recommend more than 4mil,if you have to design any fineline in PCB,you can set the finelins down to 3mil,but please try to set the trace width as bigger as you can. The bigger trace width is helpful smooth production,the fineline will cause higher failure rate in manufacture and higher costs in purchasing. For the thin trace width,you can add teardrops to the connections of tracks and pads.Teardrops are useful for high voltage/amperage traces. Anyway,PCB layout practice is a difficult subject to talk about because there are so many  rules, regulations and standards ,so please comply with the different rules, regulations and standards when you design different PCB. ...

Continue Reading

Which PCB layout software is better to use?

It's hard to choose the PCB layout software for anyone who never used such a software, there are to many softwares for choosing. The international current popular of PCB layout softwares include Eagle,EasyEDA,Allegro,ORCAD,Kicad,PROTEL (Altium Designer),PADS (PowerPCB),gEDA...

Continue Reading

A common question about prepreg thickness

Today our customer(Poland) told me that he is designing a 8 layer PCB that with 100ohm impedance controlled. He has calculated the layer stack-up on Polar si9000 for defining the dielectric parameters, he asked me that he want to make sure that if he can define any prepreg thickness to us(PCB houses), or do we have standard thicknesses? I answered him the prepreg have standard thickness,and you'd better to choose normal prepreg,because we don't have any special prepreg in stock for niche market. Anyway,all of our customers could define the prepreg thickness and type in fabrication spec. If we do not have prepreg with required thickness or types, we will make very small change(by Engineering Query) to meet the layer stack-up and impedance requirements....

Continue Reading

How to choose material for layer stack-up of multilayer PCB?

When someone works on a multilayer PCB project,they have to calculate a stack-up for that PCB. Some of them may have some questions about how to choose material for layer stack-up of multilayer PCB? For example,using Isola 370HR for a 4L project,assumed the finished board thickness is 1.6mm+/-10%,we can choose cores with 40 mils thickness. But there are 3 ways to choose prepregs (woven glass) for the dielectric layer with each 8mil: 3x1080, 2x2116, 1x7628. Their thickness is not too much different, and all of them could meet requirements impedance. How could we decide which one should be used? RCYPCB suggest to choose 2x2116,it's a good choice, it is more common material and with opulent resin, save your time and money,and assured PCB quality. By the way, if you don't know how to choose prepreg for layer stack-up,please indicate the dielectric thickness and dielectric constant value in Gerber or spec, we (PCB factory) will...

Continue Reading

The differrence between PCB and PCBA

PCB is the short name by Printed Circuit Board. PCB mechanically supports and electrically connects electronic components or electrical components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate.(From Wikipedia) There are several types of PCBs such as single sided, double sided or multilayer PCB. PCBA is the short name by Printed Circuit Board Assembly.PCBA is a finished product after all solder paste on the bare PCB and with components like resistors, ICs (Integrated Circuits), capacitors,inducer,diode,transformers and any other components,the components using is depending on the application and desired characteristics of the board. In brief,PCB is a bare board, a semi-finished product;PCBA is a PCB with components,it's a finished product(such as graphics card,memory bank)....

Continue Reading

What are the matters caused smear removal uncleanness?

What are the matters casused smear removal uncleanness? Smear removal uncleanness is very easy caused quality matters,so it's very important to know the reason why smear removal uncleanness. 1.Drilling holes produce too much clutter. 2.The liquid temperature in the tank is too low. 3.Bulking time is not enough. 4.The PH value is not in a suitable range. 5.The smear removal tank is not clean,too much dopant. 6.The cycle of potassium permanganate is not good. ...

Continue Reading

Color is really a matter in PCB design?

Too many people like to judge the good and bad of the board based on the color of the PCB,in fact, the color of the PCB is not directly related to its performance.The function of solder mask is to prevent the electrical components cause a wrong welding during welding process,and it also has another function that prevent welding components from oxidation and corrosion during use, and reduce the failure rate. So what is the effect of solder mask color on PCB board? The ink colour has no effect on the finished product, but it has a great influence on the semi-finished product(e.g. remain the solder mask dams). Solder mask colour is not very important in PCB design,different color PCBs are more for different customers' preference,however, strictly controlling every detail of each link in the PCB design and production is the premise of good board. Therefore, we do not recommend users...

Continue Reading

The application of directional coupler

Directional coupler, a passive device used in radio technology.The application of directional coupler as below: 1) For power synthesis systems. In the multi-carrier frequency synthesis system,a directional coupler with 3dB is usually used.(generally called 3dB bridge) 2) For receiver's anti-interference measurement or stray measurement. In the FR test and measurement system,if the tested device is a receiver,usually through the coupled end of the directional coupler, an adjacent interference signal can be injected into the receiver, and then the receiver anti-interference performance can be tested through a comprehensive tester connected to the direct end of the directional coupler. 3) For signal sampling and monitoring. The on-line measurement and monitoring of the transmitter may be one of the most extensive applications of directional couplers. 4) For on-line measurement of power. Directional coupler is a very important device in the power measurement technology. China PCB manufacturer factory supplier, printed circuit board, rigid PCB,...

Continue Reading

Several types of transmission lines

1.Coaxial-cable and twisted-pair.They are often applied for connection from systems to systems.The characteristic impedance of coaxial cable is usually 50Ω and 75Ω,and twisted-pair cable is usually 110Ω. 2.Microstrip line in PCB.Microstrip line is a banding line(signal line),Separated from the ground plane by an electrical medium.If the thickness, width, and distance between the lines and ground are controllable, the characteristic impedance of the line can be controlled. 3.Strip line in PCB. The strip line is a copper line in the middle of the dielectric between two conductive planes.If the thickness ,width,dielectric constant and the distance between the two conductive planes are controllable, then the characteristic impedance of the strip line is controllable. China PCB manufacturer factory supplier, printed circuit board, rigid PCB, flex-rigid PCB, Asia PCB,Chinese PCB, China PCB-Fabrik,Китайская фабрика печатных плат, Kiina PCB-tehdas, China fábrica de PCB,Çin PCB fabrikası, סין מפעל PCB ...

Continue Reading

CAM software automation

Some of the industry-leading manufacturers are already enjoying the great benefits of process automation,such as production capacity improvement,data quality improvement and training time shortening. Why do we need to automate? Why CAM can't meet all needs of automation function that we only need to push the right button to achieve auto-output? It's easy to answer the questions.There is no one in the world who does the same thing in the same way. Every manufacturer has its own way to use CAM system. For example,in the panel design,every manufacturer usually uses very different symbols,target hole and legends,and places them on different areas of the board edge. That's why CAM only offered basic functions and users need to expand the database when they used. The advantages of CAM automation: Production capacity improvement. No matter how many layers of the PCB, automation can shorten the hour to three minutes for panel design. Data...

Continue Reading