As a general rule, this thickness of copper foil for single-sided PCB and double-sided PCB is approx.35um(1.4mil). There is also another specification, which is 50um and 70um. The surface thickness of multilayers PCB is 35um(1oz(1.4mil)) generally, and the inner layer has a thickness of 17.5um(0.7mil). 70% of PCB uses the copper foil thickness of 35um. This is based on PCB purpose and signal voltage as well as current. In addition, for PCB requiring large current, copper thickness of 70um or 105um will be used, and 140um is also used in some cases.
heavy copper pcb
People often use OZ to represent copper thickness. 1OZ stands for the thickness of 1OZ copper covered on the area of 1 square feet evenly. I.e. approx. 1.4mil. The weight of unit area is used for representing the average thickness of copper foil. I.e. 1oz=28.35g/ FT2(FT2 stands for square feet, 1 square feet=0.09290304 square meter).
For heavy copper PCB, if the substrate has a thickness of 1 to 3mm, then the thickness of composite copper foil will be approx.35um. If the substrate has a thickness of less than 1mm, then the thickness of composite copper foil will be 18um. If the substrate has a thickness of above 5mm, then the thickness of composite copper foil will be 55um.
heavy copper pcb
The thickness of copper foil(wiring width) will influence current. Even though there is a formula to directly calculate the largest current loading capability of copper foil, things will get more complex when designing wiring. In this case, safety should be fully taken into consideration during design.
Copper foil will have different thickness, if there are different purposes. General 0.5OZ, 1OZ and 2OZ copper foil are most widely used for consumption and communication products. The thickness of copper foil above 3OZ belongs to heavy copper products, which are widely used for products with large current, such as high pressure products, and power supply board.
This is all about how to choose proper copper thickness during your project. Hope this is helpful to you. If you are still confused, please contact EBest Circuit (Best Technology). We have online customer services for 24 hours.
With the development of LED technology, LED power keeps increasing. This is closely related to heat dissipation. In order to resolve heat dissipation of LED with big power, aluminum-based copper-clad laminate is highly applied in led strip field.
Aluminum PCB(metal-based heat dissipation board) is a kind of unique metal-based copper-clad laminate. It has good head conductivity, electrical insulation and machining performance. Single-sided aluminum pcb consists of three layers of structures:circuit layer(copper foil), insulation layer and metal-based layer. Circuit layer requires large current-carrying capability, so we should use thick copper foil(generally 35um to 280um). The insulation layer for heat conduction is the core technology of aluminum pcb. It is general composed of special polymer filled with special ceramic. Small heat resistance, excellent viscoelasticity and anti-aging are all its advantages. And it is also able to bear mechanical and heat stress. Metal-based layer is the supporting component of aluminum pcb, and it needs to have high heat conductivity, so we generally use aluminum board, or copper board(which can provide higher conductivity). And it is suitable for regular machining such as drilling, punching and cutting. Techniques include gold plating, solder levelling, osp, ENIG, lead-free ROHS and so on.
single-layer-mcpcb-stackup
Aluminum pcb is commonly seen in LED products and has two sides(the front side and the reverse side). The white face is used to solder LED pin, and the other face presents natural color. It is generally painted with thermal conductivity paste and then contacted with heat conduction part. LED aluminum pcb is mainly used in power amplified mixed integrated circuits for STK series, motor cycles, automobile and electronics field.
There are many kinds of aluminum pcb for led tube, which varies based on the length and width of led tube. Aluminum pcb for led tube is popular with people due to its good quality, and durable and energy-saving features.
led strip
Aluminum pcb for led tube can save electricity as high as 70%. The light intensity of 12W Led tube is equal to 40w fluorescent tube. The service life of LED tube is is more than 10 times that of general fluorescent tube. It can be free of maintenance. Also, there is no need to change LED tube, barratter and starter frequently.
Generally, fluorescent tube has high temperature inside and needs to be used for more than 10 hours everyday in most cases. This problems are perfectly resolved by aluminum pcb for led tube.
If you have any queries, comments or suggestions on aluminum pcb for led, welcome to leave your message.
Confirm the processing method of the hole: Drilling and punching are used to process the holes of mcpcb multilayer. The feed degree and rotating speed of drilling is different from FR-4 PCB material. Adjustment needs to be made according to base material. Generally, we set the feed degree at 1-1.5 mil/rev, and the rotating speed at 20000-60000RPM. Punching requires specialized tooling to meet the needs of metal punching.
Outer Layer Drilling-the 2nd production process of mcpcb multilayer
Drilling of the inner layer core board should be carried out, according to the drilling parameters of FR-4 PCB. There should be enough vacuum degree and pressure foot, for keeping holes clean and removing debris. The number of drilling holes and wear condition should be well controlled.
Making Inner Layers-the 3rd production process of mcpcb multilayer
During the process, we use dry film(1.3-2.5 mil water solubility light induced corrosion resistant dry film), and wet film(wet film light induced corrosion resistant solvent).
Circuits Electro-Plating/Etching-the 4th production process of mcpcb multilayer
Circuits Electro-Plating: Acid copper plating and tin plating are suitable for double-sided core board.
Etching: During etching process, we need to adjust speed according to the thickness of copper foil. In order that core board can be etched smoothly, we can reduce pressure of etching spraying, or make towing plate.
After lamination, when epoxy resin is completely cured, and epoxy resin of board is removed, 2nd drilling should be carried out. This operation involves mechanical processing of metal-base composite material. This is a challenge to structure of mcpcb multillayer. Special attention should be paid during operation, especially location precision and quality of processing holes.
Making Soldermask-the 7th production process of mcpcb multilayer
There are 4 ways for making soldermask: liquid light induced corrosion resistant solvent; Thermosetting soldermaskï¼›UV curing soldermask; Dry film soldermask.
Surface Finishing-the 8th production process of mcpcb multilayer
In order to facilitate assembly of components, exposed copper foil surface must be treated, for enough solderability, good bonding power and comprehensive manufacturing performance. There are 4 ways for surface finishing: HASL, OSP, Sn and Ni/Au.
Packaging of mcpcb multilayer is important for reducing abrasion mark and wear. Using low-sulfur sheet for vacuum sealing is a good choice. Foam can also be used separately. The key is to isolate soldering flux from aluminum surface, in this way, we can eliminate galvanic electricity reaction between different metals.
Tomorrow March 8th, 2020 will be the Women’s Day! As it’ll be Sunday, so everyone in EBest Circuit (Best Technology) get the gift today: One box of facial mask, one bottle of eye cream, and one bottle of moisturizer
We hope every lady in EBest Circuit (Best Technology) keep happy, beautiful,
while they’re working so hard, even working in middle night, in order to give
our customers immediate reply. This is one of reason why you can see email reply
within one hour sometimes even in the evening!
It’s the first time that every girl in EBest Circuit (Best Technology) take a photo with a face mask! Everyone in EBest Circuit (Best Technology) want the Coronavirus to be finished ASAP, so that everyone doesn’t need to have a face mask and global economic turn back to normal level. At that time, we can take a photo again so that you can see the smiling face of our girls😊 and we believe that day will come in soon!
If you want to ask some information about our product (FR4 PCB, metal core PCB, ceramic PCB, PCBA) or service, you’re welcome to send email or call us anytime!
This is another test for China and the world community
after SARS. At this moment, any slamming, taunting, fanning, and gloating are
all manifestations of lack of humanity. The virus does not recognize the
country, nation, race, rich or poor. There is no difference in virus
transmission.
China’s powerful system and the
effective measures it has taken to prevent and control novel
coronavirus-related pneumonia are rarely seen in the world, Director-General of
the United Nations’ World Health Organization Tedros Adhanom Ghebreyesus said
on Tuesday.
Ghebreyesus made the remarks while
meeting with State Councilor and Foreign Minister Wang Yi in Beijing.
The WHO and the international
community highly appreciates, and fully affirms the decisive measures the
Chinese government has taken to deal with the outbreak and also thank China for
its tremendous efforts to curb the spread of the contagion, he said.
China set a record in identifying
the pathogen in a short time following the outbreak of the contagious disease,
Ghebreyesus said, and he praised the country’s timely sharing of the virus’ DNA
information with the WHO and other countries.
I don’t know the source of the so-called news of many foreign friends. As a Chinese, I saw the initial panic, and I also saw the current stability.
Chinese government extended holiday
In response to the GVM’s call, the school has delayed the start of school, and most companies have extended the Spring Festival holiday from original Feb 2nd to Feb 9th and resume on Feb 10th. This is not a sign of lack of confidence in controlling the virus, it is one of the measures to put people’s lives first.
Everyone knows that this is the most effective way to
control the spread of the virus.
I went to supermarkets, fruit shops, etc., and there was
no snap-up like it was fabricated by some media. Prices have not skyrocketed.
The price department is also strictly controlling the prices of daily
necessities to protect people’s daily lives.
Relevant departments have made the unified deployment of
some protective supplies such as masks to ensure timely and adequate supply.
Which country can make such an appropriate response in the first place?
It’s really boring to stay at home every day, but who
wants to joke with life? As someone who is very busy working every day, having
more time to spend with his family may also be a good thing. After all, too
many people complain that the Spring Festival holiday in just a few days is not
long enough.
The internet is well developed. Although I can’t meet my
relatives, friends, colleagues to celebrate the Spring Festival, isn’t it
convenient for video chat, using WetChat of Facetime for people around the word?
Why not give up the temporary joy in exchange for the safety of life?
We are very grateful to the medical staff, community
service staff, and social service staff who gave up their holidays and took
great risks in helping patients, maintaining social stability and creating a
more secure environment.
I am grateful for living in such a country. I believe that
every Chinese thinks so.
In such a severe situation, in order to eliminate the
virus as quickly as possible and ensure the safety of people’s lives, any
measures are reasonable.
Every Chinese should understand and understand.
People of all countries in the world who have experienced
various natural and man-made disasters should marvel at China’s timely and
effective measures.
As an international trade practitioner, I have sincerely
explained to each of my customers our current status. We don’t need to
whitewash or conceal anything, because we have done our best to do a good job.
I believe that the Chinese people will be able to
eliminate the disease as soon as possible. Because we eliminated more severe
SARS than this time in 2003, didn’t we?
Here everyone in EBest Circuit (Best Technology) in China was in good health condition, and our office & facility will be opened on Feb 10th. During that period, our sales reps. will try to reply the email ASAP and thanks for the caring from all of our customers around the word! Much appreciated!
The primary advantage of ceramic multilayer PCBs lies in their thermal properties. The most significant of these is thermal conductivity, which outperforms traditional materials by a tremendous margin. In the table below, the most used board material, FR4, is compared with the ceramic multilayer board in a number of important categories.
ceramic pcb
MULTILAYER PCB MATERIAL COMPARISON
Ceramic
Versus
FR4
28 – 280
Thermal Conductivity (Wm-K)
0.8 – 1.1
Component Comparable
Coefficient of Thermal Expansion (CTE)
Component Comparable
High
Frequency Performance
Low – Mid
Fragile
Handling
Easy
Low
Availability
High
Mid – High
Cost
Low – Mid
As shown above, ceramic multilayer PCBs have advantages and disadvantages as compared to FR4. However, the advantages point to a continued increase in the use of ceramic boards for high-speed and high-power applications that are criteria for more functionality in smaller packages.
ceramic pcb
EBest Circuit (Best Technology), the industry leader in fast, precision and high-quality PCB manufacturing, has a wide range of material options including to meet your design objectives. This includes accommodating the special process of using ceramic materials for your board if desired. We also strive to provide you with the best manufacturing experience.
HDI PCB (High Density Interconnector PCB), is a printed circuit board having a relatively high line distribution density using the micro-blind and buried hole technology.
It is a process that includes an inner layer line and an outer layer line, then uses a hole and a metallization in the hole to realize a joint function between the inner layers of each layer.
HDI PCB-1
With the development of high-density, high-precision electronic products, the requirements of high-density and high precision are imposed on printed circuit boards. The most effective way to increase the density of pcb is to reduce the number of through holes, and to accurately set the blind holes and buried holes to achieve this requirement, thereby an HDI PCB came into being.
HDI PCBs are finding their way into a growing number of products:
Military communications devices and other strategic equipment
Aerospace – smaller space requirements and light weight are ideal for such applications
Computers and smartphones – phones and computers are taking full advantage of smaller profiles, reduced weight, and increased functionality, made possible through the integration of HDI circuits.
HDI PCB-2
Medical equipment – diagnostic and monitoring equipment has become more reliable and expanded with technical features that aid medical teams with patient treatment, and all of this is powered by HDI PCBs and advanced software.
HDI PCB utilizes buried or blind vias, or a combination, and may also incorporate microvias with an incredibly small diameter. This facilitates the incorporation of more technology in less space, with fewer layers. Multi-layer HDI PCB are also in common use, with many layers being accommodated through various construction methods utilizing blind, buried, stacked, and staggered vias.
With smaller components and blind via in pad technology, components may be placed closer together, resulting in faster signal transmission rates while also reducing crossing delays and signal loss. These are key considerations that generate improved performance of HDI PCBs.
HDI PCBs are preferred for applications where space, performance, reliability, and weight are concerns. This makes them more suitable for nearly every application related to electronics, consumer products, computers, and aeronautics.
Multi-layer HDI PCB can provide strong interconnection of stacked vias, resulting in high levels of reliability, even in more extreme environments.
Considering this, do you ever think about choosing HDI PCB on your next project?
FR4 is the most common material grade that comprises fabricated PCB. FR indicates the material is flame retardant and the 4Â indicates woven glass reinforced epoxy resin. Single or double-sided PCB structures consist of an FR4 core and top and bottom copper layers. Multi-layer boards have additional prepreg layers between the center core and top and bottom copper layers. Now, the core consists of a substrate with copper covering, also referred to as a copper clad laminate. The core, laminate, and prepreg may all be FR4 with the copper sheets between the signal and ground layers.
FR4 PCB
The properties of FR4 may vary slightly depending on the manufacturer; however, it generally has favorable strength and water resistance attributes that support its widespread usage as an insulator for many electrical applications. It serves the same purpose in PCBs, namely to isolate adjacent copper planes and provide overall bending and flexural strength for the structure. FR4 is a good general purpose material for PCB fabrication; however, alternative materials are available.
Alternative PCB Materials
Prior to the explosion of multilayer FR4 PCBs, there were many alternative board materials to FR4. These included FR2, CEM 1, and CEM 3, which were paper-based. However, the strength of FR4, especially for multilayer boards, was a major factor in separating it from alternatives to become the industry standard. Today, there are other materials that are used for single-sided, double-sided, non-plated through-hole (NPTH), and multilayer PCBs, in addition to FR4. These are compared in the table below:
FR4 Material VS Other Materials
The results above clearly indicate that FR4 is a good general purpose material as its parameters are mostly comparable to the other alternatives. It excels in structural integrity with a 2.0 N/mm copper adhesiveness and matches the alternatives in bending strength.
FR4 PCB
FR4 is the most widely-used material in PCB construction. Boards made from FR4 are strong, water resistant, and provide good insulation between copper layers that minimizes interference and supports good signal integrity. At EBest Circuit (Best Technology), the industry leader in fast, high-quality PCB prototype and PCB manufacturing, we are capable to meet your board material needs for any case. We will work with you to help you select the materials that will best implement your design intent.
Should you have any queries about FR4 material, contact us anytime, and our sales representative will give you a response at our soonest convenience.
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.
EBest Circuit (Best Technology), a China- based assembly manufacturer will be exhibiting at PCB West 2020 in Santa Clara, CA at booth No. 514 on September 9, 2020(Western Time). Actually, we have participated in this exhibition for continuous 2 years. Here are some pictures for your reference. At EBest Circuit (Best Technology)’s exhibition booth, attendees will be able to learn more about our company for PCB manufacturing and assembly technology.
at the exhibition boothCeline is talking with customersMarina is talking with customersCoco is talking with customersat the exhibition booth
For interested professionals, EBest Circuit (Best Technology) had on hand experts to offer detailed insights and experience on PCB assembly, covering prototype and low/high-volume production. For more information on PCB assembly and fabrication, please visit EBest Circuit (Best Technology)’s exhibition booth No.514 at PCB West 2020.
You are warmly welcome to talk more to see how we manage the components wastage and efficiency to help save your time, money and energy.
About PCB West
SANTA CLARA, CA, PCB WEST 2020 PCB West is an annual event sponsored by major electronics manufacturing vendors and attended by electronics engineers, technicians, managers and more. PCB West is a marketing, product launching and career enhancement event that offers a 1-day exhibit and a 3-day conference. You will get more closely connection with new Technology in PCB field from PCB West.
Welcome to visit us at Booth 514 on September 9, 2020(Western Time).
