As we all know if ceramic PCB is very fragile, so it is not easy to do SMT for them.
But we can do the SMT for ceramic PCB easily because we do it every day and we have more than 15 years experiences for doing that.
For the almost SMD components (such as SMD rsistors, capacitors, diode etc), normally we will add the solder paste by using SMT stencil, then put the components by machine, finally do the oven reflow.
For some special components, we will need to solder it by hand, such as through connectors, but it can’t be soldered by hand directly, it need to be put on the heating table to keep the temperature is high enough to make the solder past at melt state. Because the ceramic material with very good heat dissipation, the solder paste will be solidification very easily if don’t put the ceramic PCB on heating table
For some small LED, it can’t be put by SMT machine, because no such small feeder to pick it up, then need to put it on board by hand.
We can do very well for the small BGA components too.
Surface-Mount Technology has been the industry standard for assembling printed circuit board. It has maintained its popular due its wide array of advantages and relatively few drawbacks. For more than 15 years’ experience, Best Technology has been offering surface-mount service for worldwide customers, and SMT service become a great part of our business.
See some photo which we are do assembly for our customer this month.
SMT 1
Top Advantages of Surface-Mount Technology
Smaller size and reduced weight are the two main advantages to SMT. Components can be aligned closer together and end products will be more compact and light weight.
SMT 2
Here are additional benefits of SMT:
1.Component placement auto correctly – there is no alignment between the PCB solder pads and components pads to avoid placement errors.
2.Low cost:
The advantage of small size up to 0201. One set, SMT typically requires lower production costs than through-hole placement. The size of the board is reduced, the number of drilled holes is reduced, and routing of traces is reduced. So bring down the cost of the whole project.
3.Design flexibility – You can combine through-hole technology and SMT manufacturing on the same board for greater functionality.
4. Printed circuit boards created with the SMT process are more compact, providing higher circuit speeds. (This is the main reasons most manufacturers choose for this method.)
5.Higher circuit speeds – Most manufacturers rate this the number-one benefit.
Using Surface-Mount Technology, it can save lots of time, SMT is a much more streamlined manufacturing process compared to through-hole. Time is saved because components are applied using a solder paste instead of drilling holes in the PCB
7. Quantity – More components can be positioned using both sides of the circuit board, creating more connections for each component. Fewer circuit boards are needed for devices.
8. Stability – Better performance delivery is realized with vibration mechanical conditions. SMT connections are more reliable, it can reduce the dis connection risks during the final test.
SMT 3
Best Technology offers expert surface-mount technology services in China, along with manufacturing bare printed circuit board, flexible circuits, and MCPCB fabrication. With more than 15 years rigid PCB board experience, Best Technology has the resources, equipment, and know-how to produce your PCBs quickly and reliably.
If you work in Printed Circuit Board industry, you may know a normal PCB FR4-Tg is 130-140 degrees, the medium Tg is greater than 150-160 degrees, and High-TG FR4 Printed Circuit Board is greater than 170 degrees. And what is a High-TG FR4 Printed Circuit Board? High-TG PCB is another name for a high-temperature FR4 PCB, it means the printed wiring boards designed to endure for extremely high-temperature. A Printed Circuit Board is defined as high-TG FR4 PCB if its glass transition temperature (TG) is higher than 170 degrees Celsius. High-TG FR4 will have better mechanical and chemical resistance to heat and moisture than standard FR4. The higher the TG value, the better the temperature resistance of the material, so High-TG FR4 is more and more popular particularly working in high power industry. Best Technology can provide many different High-TG FR4 material for Rigid Circuit board, Typical High-TG FR4 PCB material including: ITEQ-IT-180A, ISOLA 370HR, ShengYi S1000-2 and etc.
Part of the inventory of raw material-1
Part of the inventory of raw material-2
Part of the inventory of raw material-3
From the following PCB picture, you can see the normal TG130 FR4 PCB substrate is not only softening, deformation, melting, as well as other phenomenon working under high temperatures, but also there is a sharp decline in electrical properties, which will effect on product life.
Solder mask blistering-1
ã€ÂSolder mask blistering-2
If your FR4 Printed Circuit Board or PCBA board appear to above problems, then you should consider to use a High-TG FR4 Rigid Circuit Board. it may be catching your interest willing to understand a little bit more about High-TG FR4 printed circuit boards. Because High Tg Rigid Circuit board have a better stability at high temperatures, the substrate provides better heat resistance, mechanical and chemical stability for the circuit board.
BPM20396)
Properties/ Applications of high Tg PCB With the rapid development of electronics industry, High-TG FR4 PCB is widely used in Uninterrupted Power Supply, precise instrument as well as industry. High-TG FR4 PCB material probably designed for the high functionality, high multi-layer development high-density circuit; higher heat resistance and high-density surface mounting technology (SMT). So, the demand on High-TG FR4 PCB material become more widely used PCB manufacturing. What’s more, High TG material is also popular in LED lighting industry, because heat dissipation of LED is higher than normal electronic components, but same structure of FR-4 board is much cheaper than metal core PCB, such as aluminum PCB. High-TG FR4 PCB materials have the following properties:  Resistance to high temperatures  Long delamination durability (aging of materials to consider for safety reasons)  Low thermal expansion Excellent PTH reliability Good mechanical properties High temperature durability High value of thermal stress resistance high temperature durability long delamination durability Low Z axis expansion (CTE)
BPM19308
Advantages of High-TG FR4 PCB Higher stability: it will automatically improve the heat resistance, chemical resistance, moisture resistance, as well as stability of the device if increasing the TG of a printed circuit board substrate. Bear high power density designs: high TG PCB will be a good solution for heat management if the device has high power density with quite high heat generation rate. It can achieve with using a larger printed circuit board to change the design and power requirements of a device when reducing the heat generation of ordinary board, what’s more, it also can use the high TG PCB. Ideal for multilayer & HDI PCBs: there will lead to high levels of heat dissipation because multilayer & HDI PCBs are more compact and have dense circuits. So high TG PCBs are often used for the multilayer & HDI PCBs so that it can make sure reliability in Printed circuit board fabrication.
BPM20005 TOP
BPM20005 BOT
If your applications are in any danger of subjecting your PCBs to extreme temperatures or the PCB is required to be RoHS Compliant, it will be in your best interest to look into high-TG FR4 PCBs. Come to contact Best Technology Co., Limited. for High-TG PCB assistance. we can help you determine if you need high-temperature printed circuit boards and direct you to which specific boards are likely to be useful for your design and application. If you are transitioning to RoHS or just need more information about the High TG laminates, just give us a call and we’ll be happy to accommodate you. contact us online right now.
Printed Circuit Board surface finish is a coating between bare FR4 board and components. The main function for surface finish is to protect the exposed copper circuitry and provide a solderable surface when assembling（soldering) the components to a copper clad PCB board.
Most of the Rigid Circuit board company can make several different types of surface finish. Best Technology as a leading custom FR4 printed circuit board manufacturer since year 2006, it could provide following different finish. HASL Lead-free HASL Immersion Tin/Immersion Silver OSP (organic Solderability Preservative) Gold ENIG (Electroless Nickel Immersion) Hard Gold Wire bonding Gold
As the surface mounts assembly service became more complex and needs to conform to new regulations like RoHS and WEEE. People maybe face the question how to choose a suitable surface finish for your FR4 Copper board?
Before decide to choose suitable surface of copper conductors circuit board, you may need to take the cost, RoHS, your components type, PCB assembly method, factory circuit fabrication capability, and rigid board circuit testability into consideration. Basis on above information of copper foil PCB, we would like to make a explain PCB finish in detail, wish this may help when you make decision at circuit board design and manufacturing.
HASL/Lead Free HASL It is a most popular surface finish, and the cost is low and easy to repairable, it is acceptable for simple SMT. But the surface is uneven, it is not suitable for fine pitch components and not good for plated through-hole(PTH). In other way, it is poor wetting. Material different with same finish HASL(standard):Typically Tin-Lead HASL(Lead Free):Typically Tin-copper, Tin-Nickel, without lead The thickness will conform to IPC 6012 class 2 standard
Advantages of HASL-LF Excellent solderability Inexpensive / Low cost Widely Available and used Easy reworkable Allows large processing window Long industry experience / well known finish
Disadvantages of HASL-LF Uneven surfaces for printed circuit board No good for fine pitch components from Samtec/Hirose/Molex Thermal shock Solder Bride for circuit board assembly Plugged or reduced PTH’s Not suited for < 20mil pitch SMD & BGA Bridging on fine pitch Not ideal for HDI products
Immersion Tin
Advantages Flat surface No Pb Good for fine pitch / BGA / smaller components Mid range cost for lead free finish Press fit suitable finish Good solderability after multiple thermal excursions Easy reworkable
Disadvantages Very sensitive to handling – gloves must be used Tin whisker concerns Aggressive to solder mask – solder mask dam shall be ≥ 5 mil Not recommended to use peelable masks Exposed tin on final assembly can corrode Not good for multiple reflow/assembly process Difficult to measure thickness
OSP (organic Solderability Preservative) OSP(organic Solderability Preservative) same with HASL, lower cost but the OSP have flat surface, and it is not good for PTH components, sensitive and short shelf life, it is very easy come to oxidation.
Advantages Flat surface No Pb Good for fine pitch / BGA / smaller components Inexpensive / Low cost Easy reworkable Simple Process Disadvantages Not easy to measure thickness Not good for circuit copper board plated through-hole(PTH) Short Shelf Life Maybe cause ICT issue Exposed Cu on Final assembly Handling sensitive– gloves must be used and scratches avoided
The above surface finish of Printed Wiring Board compared with Gold finish, the cost is corresponding cheaper, but in my coming blog, I would like mainly to explain Gold finish for printed circuit board fabricator with 13 years rich-experienced in FR4 PCB custom contract manufacturer.
If you have any question about the printed circuit boards (PCBs). Warmly welcome to send mail or call Best Tech.
As we all know, the short & open circuits is a very common issues for the Printed Circuits Board, especially for the extra thin PCB, because its substrates thickness are very thin, generally from 0.4mm-0.15mm, so the circuits will be easy to be broken if we didn’t control the production process well.
So, you may want to know, as an experienced PCB manufacturer, what we will do to avoid the circuits issues?
Here let me show you what we do:
Firstly, after the process of copper plating, we will put the boards into our washing line to remove those drilling burr, surface oxide layer, etc. To make sure the boards are fully clean before start the traces making process.
pcb washing
Actually, most of the open and short circuits problem are caused by the film scratching, so each operation while the pattern transfer process is very important.
That’s also why the exposure and developing need to be processed in the dust-free workshop. We will use the rack to place each PCB board separately, to avoid the touching between PCB.
pcb explosure and developing
After the circuits etching out, we will take the boards to do the AOI testing, to check if there are any broken circuits, short gaps, protrusions, copper surface garbage and other problems. If there is, our machine will alert the problem, and we will fix the problem or scrap the defectives boards, with this process to prevent the defective boards move to the next step.
Most importantly is that we will do the first article inspection for all the boards, as long as we found the circuits issues while the AOI process, we will not take the whole batch boards go ahead.
aoi testing
Besides, the operation standard while the etching process is also very important for how the traces being. So, our production team will control the running speed of the etching machine very strictly. If it is a PCB with o.5oz bottom copper , only allow walk 1.4 meters at per minute, if 2oz, walk 0.8m one minute.
etching pcb
Except above process, all the boards will be required to do a final electrical testing before move to the packing. For prototypes, we will use flying probe testing. For volume, we will open the E-testing fixture to do the testing.
In our company, for the extra thin PCB, if the boards thickness lower than 0.2mm to do the flying probe testing, it needs to be tested before the outline process, because the boards are too thin to support the boards well while the flying probe, it will fall down easily.
flying probe testing and electric testing
Of course, our QC people will do the double visual inspection to make sure all the boards are being well made.
fr4 pcb inspection
We always try our best effort to prevent any defective boards send to customers.
Quality and Customers Scarification, it is always our company’s pursuit.
Best Technology, a China- based assembly manufacturer will be exhibiting at electronica Munich2020 in Bavaria, Germany at booth No. 623(Hall B1) from November 10, 2020 to November 13, 2020(Western Time). Actually, we have participated in this exhibition for continuous 2 years. Here are some pictures for your reference.
pcb exhibition
pcb exhibition
pcb exhibition
pcb exhibition
At our exhibition booth, attendees will be able to learn more about our company for PCB manufacturing and PCB assembly technology.
For interested professionals, Best Technology had on hand experts to offer detailed insights and experience on PCB assembly, covering PCB prototype and low/high-volume production. For more information on PCB assembly and fabrication, welcome to visit our booth.
You are warmly welcome to see how we can manage the components wastage and efficiency to help save your time, money and energy.
About electronica Munich:
Electronica is the international trade show for electronic components, systems and applications and shows the full range in all its diversity in width and depth as the world’s leading trade fair. It reflects the high degree of innovation throughout the industry. Exhibitors and users in the areas of systems, applications and technologies of electronics can receive the information of the latest innovations and developments in the fields of system peripherals, power engineering to printed circuit boards or EMS.
Welcome to visit us at Booth 623 from November 10, 2020 to November 13, 2020(Western Time).
The abbreviations PWB and PCB are very common, especially in the field of electronics manufacturing. Therefore it is necessary to gain a clear understanding of the meaning of each one and the differences between the two. On this article, we will help our readers to distinguish PWB from PCB.
pcb vs pwb
PCB: Based on insulating substrate, it means a kind of products on which the wires are connected and components are printed from point to point on a dielectric substrate in a predetermined design. It is the English abbreviation of Printed Circuit Board.In a word, PCB stands for printed circuit board, where the width, side to side and multi-layer relationship(spacing) of conductor runs has or is designed to have a specific effect on circuit operation other than just a point to point connection.
PWB: Based on insulating substrate, it means a kind of products on which the wires are connected from point to point on a dielectric substrate in a predetermined design. However, there is no printed component on it. PWBs are the early name of the British, because at that time there were only circuit diagrams on the circuit board, but no printed components. So they belonged to the more primitive board. Under its effect, now many traditional British and some Hong Kong people still call the circuit board to be PWB, which is the English abbreviation of Printed Wire Board. In a word, PWB stands for printed wiring board, one of the first uses when the issue was only a point to point connection.
The PCBs are the boards already equipped with various components, however the PWB is just a designed substrate with no components.
pcb vs pwb
Moreover, PWB vs PCB greatly varies from one region to the other. For example, in the United States of America, the term Printed Circuit Board is more common in use while the use of the name PWB is more commonly used in Japan. In Japan, PWB is more preferred that PCB because it prevents confusion with another name, polychlorinated biphenyls, which refers to a particular poison available in Japan.
For your more information, in approximately 1999 the IPC Technical Activities Executive Committee made a mandate to only use the term PCB for all new document development because more often than not the printed circuitry design will have an impact on function.
If you are still confused or have any queries or comments about PCB, do not hesitate to contact us. Our sales team can give you a reply at our soonest convenience.
PCB is an indispensable part for any electronic equipment in small toys or computers., etc. The complex interconnection components include resistor, diode and capacitor, which help components work normally in series. In a sense, it is similar to the “brainâ€Â of the system. PCB assembly process must be of no any mistakes. Here are some points that need to be paid attention:
1.Supply chain management: In order to create high quality PCB, the first thing needing consideration is supply chain. For the availability, both quality and price are important, so is delivery time of components.
pcbassembly
2.PCB layout. The common question during manufacturing stage is pcb layout in minor differences. Even though various types of designs looks the same to outward seeming, the manufacturing processes are different. You need to ensure PCB layout is feasible during manufacturing process.
3.Test-test has to be conducted after PCB assembly. What needs to be done is to design test point. Some tests include:
Micro-section analysis-also referred to as cross section analysis. This test contributes to identifying components fault and thermal-mechanical faults.
pcbassembly
Solderability test. This test contributes to testing reliability of PCB solder pad, to ensure a firm surface and a reliable soldering point. It also contributes to confirming if storage will have an effect on solder components.
PCB pollution test-This can test many issues, such as corrosion and degradation. Scaling powder residue will result in pollution and thereby case components failure. Pollution analysis is famous for its accuracy and preciseness.
Optical microscope-This can test the issues relevant to PCB and soldering as well as overall pcb assembly. The process is famous for its speed, as it involves using high-power microscope to inspect incorrect structure.
As a matter of fact, PCB experts will always know the major benefits of automated assembly processes: reduced errors, increased output and consistent quality, however, is automation always better?
The usage of SMT line machines has become standard practice in PCB assembly and is thought to be more efficient; however, SMT machines are not appropriate for every job. Manual assembly is a better option for assembling boards in low quantities or low-volume orders using components with unique properties.
SMT MachineManual Assembly
Volume Limits
Volume can be a determining factor of whether or not to assemble by hand. Orders of 10 or less boards, are often best assembled by hand- for reducing production time and faster turnaround.
Characteristics of Component Choices
The characteristics of chosen components should be taken into consideration before assembly. Careful and potentially time-consuming SMT calibration is required to minimize the risk of damage when using components with:
Heat sensitivity
Unusual shape and center of gravity
Inadequate packaging and/or documentation from the manufacturer
Therefore, low-volume orders using components with unique properties and insufficient packaging or documentation should be manually assembled by a skilled technician.
In general, it is best practice to manually assemble boards with a volume limit of 10 or less, simple technology, and when there are a few individual components per board.
SMT lines are preferred for large-volume assembly because they consistently produce quality PCBs and reduce the possibility of error associated with manual assembly. The key to ensuring quality of manual assembled boards is having a well-defined manual process, which is bound to passing through failsafe quality checks that hold hand and automated orders to the same standards.
Anyway, before starting your project, it is highly recommended that you should consult with your PCB service provider regarding your PCB assembly options.
Hardware designers requiring turnkey PCB assembly services usually face tremendous obstacles for their need of prototyping and small batches. Large companies with huge inventory needs and long delivery horizons can wait for days or weeks for a proposal, while accepting large minimum quantity requirements. For them, delays associated with overseas manufacturing are no big deal. However, these conditions are simply unacceptable for small industries, engineers, makers, and entrepreneurs.
Selecting the professional PCB assembly company at the beginning determines the success of a project. Therefore, picking the right PCB assembly services provider becomes a highly important decision to be made. One must watch out for those offering very low prices, but subsequently are unable to provide the services, record of accomplishment, infrastructure, and technology to back up their promises. Rather, one must insist the PCB assembly services have the essential features, offer the services, and follow business practices such as:
Instant Quotations
Waiting for days or weeks and trading a bunch of emails only to find out the cost of a PCB assembly, is not only a waste of time, it is expensive. A vendor offering instant, online quotations is always preferable. In general, although all vendors will start by sending a quotation for the project, therefore, selecting one who gets the process off painlessly is advisable. Moreover, selecting the vendor who gives an estimate in terms of quantity offtake helps in determining capital needs and product prices.
Prototyping Requirements
Most customers, before placing their order, want to make sure their PCB works exactly as intended. This may require making a few iterations to perfect the design. So far, prototyping was a big challenge under the old manufacturing model. However, Best Technology is willing to handle even a single quantity.
Minimum Order Requirements
Earlier, PCB assembly services were unable to accept production runs of small quantities. Older technology did not allow profitability in smaller numbers, which turned out to be a major challenge for everyone. However, use of modern technologies allows easy combination of small orders into larger ones, while switching from one task to another is no longer a major hurdle. Therefore, professional PCB assembly providers accept all types of order, regardless of quantity, and execute them at reasonable prices.
Seamless Manufacturing
With advancement in PCB assembly technologies, it is no longer necessary to track multiple vendors and suffer long lead times. A modern PCB assembly solution such as the Best Technology, offers a platform to resolve any assembly problems, online and from anywhere and takes over the sourcing, purchasing, and assembly of the components. With this approach, the product can be expected to be available in days.
The PCB happens to be only the first step of the many for most inventions and products and PCB Assembly is an especially non-negligible process. Quality can only be assured by finding a reliable company.
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