How To Find A Good PCB Supplier

Flexible PCB( WDF-FPC-D-18 ) - wonderfulpcb.com

A famous star need a good director, if Jack Chen or Tom Hanks, or Nicolas Cage met with a mediocre director, I guess the box office would take a tumble.
Just like to find a good director for a movie, if you are purchasing for PCB circuit boards, you need to find a good PCB supplier firstly.

Here are some proven tips to guide you through the selection process successfully.

Market Orientation: 

Carrying out a background research on the different suppliers will help you know the exact price that you should pay for the services to be rendered. Understanding market orientation can also help you find quality services. Note that each PCB supplier specializes in one field that he or she is good at.

Manufacturing criteria: 

What is cared most often is the manufacturing criteria of PCB supplier, his/her production capacity, lead-time, quality, and service. If a PCB supplier only have a low production capacity, your purchasing requirements may not be satisfied, for example, you need to produce a multilayer board while technology and devices of the supplier are backward and couldn’t take this order. Punctual lead-time is one of points to be considered, it is related with production capacity but also related with management system of the PCB supplier. A superior management system will greatly improve production efficiency. At last, a good service also is essential which includes prompt reply, good communication, and settlements for the quality issues.  

Desist from choosing PCB suppliers who offer low prices. Instead, you should find suppliers whose prices are directly proportional to the quality of the products. Sometimes, low quality products are very cheap as compared to high quality products. One of the major benefits of purchasing a high quality product is that they are more cost effective since they are more durable hence they require less repair or maintenance services.

Finally, find companies that have a clean track record so as to get value for your money. Their repairing costs should be affordable and in line with your budget. Once your products have passed the R & D, find a reliable partner who can help you establish and expand your market and credibility.

A PCB supplier in Shenzhen of China which you must be interested in:
http://www.wonderfulpcb.com

"Afternoon Tea": The first train technical talents for PCB industry school founded in Suining

PCB industry is the national "twelfth five-year" emerging strategic industries, high gold content technology, and technical skill talent gap more than 400000 people a year. Facing with the situation of skills talents shortage in suining, British creativity and thoughts of the school. In 2014, the state council issued "about speed up the development of modern vocational education decision", to "deepen the integration production and education, to encourage industry enterprises organize or participate in vocational education, give play to the role of enterprise important governance subject”. The open area at the same time vigorously called for a "public entrepreneurship, people’s innovation", more strengthened the faith that enterprise education. Earlier this year, the company has formed a "suining British chuangli printing technical vocational school" education plan, and get the support of municipal party committee, municipal government and the open area, the city bureau of education, city people club bureau with efficient service power enterprises."We have the confidence to the learned school-run me!"YiKeHua said.

The creativity of educational philosophy

On the concept of operations, the creativity and proposed "the CDB area economic development by service, service students' lifelong development, service PCB industry development for the purpose, committed to the development with international vision and international standard of PCB industry technical elite, the industry leader" of the training objectives, to build "the government, industry, enterprise, school, four one" training mode, the innovation "the school cooperation, JiaoJiao cooperation, cooperation, international cooperation between higher vocational colleges and the school-running idea, to create enterprise as" teaching management, teaching content, post production, project teaching method, teaching process and teaching information, teaching standard internationalization "school characteristics.

The creativity of education foundation

The creativity and the southwest university of science and technology, chengdu university of electronic science and technology and other institutions to carry out the cooperation between colleges and the talent training scheme between the two sides make joint the PCB industry, develop the school-based curriculum in the PCB production technology and participate in the teaching process. At present, the creativity and become students practice and high salary employment entrepreneurial base oral confession, three years has more than 500 people develop technical skills talents. Recently, the suining chuangli electronic technology co., LTD., is listed as one of the chengdu university of electronic science and technology postdoctoral workstation and PCB engineering experiment and scientific research achievements transformation base in Sichuan province.

The Advantages and Disadvantage of FPC

A: Disadvantages:

1. Original cost is high

Because the FPC is designed and made for special application, the cost of circuit design, wiring and photographic plate is high. Except special need, we’d better not use them.

2. The modification and correction is difficult

Once FPCs are made, if we want to modify, we have to begin from the base drawing or gerber program. Therefore it’s difficult to change. On its surface there is a coverlay. Before the modification, we have to remove it, after the modification, we have to recover it, which is difficult.

3. Dimension limitation

Since FPC is not popular, we usually use intermittent method to make them. Then we can’t make too long or wide FPC with the limit of manufacture instruments dimensions.

4. Easier to be damaged if improper operation

It is easier to cause the damage of FPC circuits because of improper operation. Special trained workers are needed in tin plating and rework

B: Advantages

FPC is the printed circuit board which is made of flexible insulating base material. It has many advantages many rigid PCBs don’t have.

1. It can be bent, rolled, folded freely, can be arranged randomly according to the space, can be moved and stretched in 3-D space, then integrate the components assembly and wiring connection.

2. It can satisfy the need of electronic products to develop in the direction of high density, smaller size, higher reliability, since FPC can greatly reduce the volume and weight of electronic products. Therefore FPC is widely applied in fields or products of aerospace, military, mobile communication, laptop, computer exterior design, PDA, and digital camera.

3. FPC also has the advantages of good thermal diffusivity and solderability, easy to assembly, low combined cost. The design of rigid-flex boards also make up the disadvantage of components carrying ability of flexible base material.

If you need expert FPC service, feel free to contact wonderful02@wonderfulpcb.com. 

Printed Circuit Board

A printed circuit board, or PCB, is a self-contained module of interconnected electronic components found in devices ranging from common beepers, or pagers, and radios to sophisticated radar and computer systems. The circuits are formed by a thin layer of conducting material deposited, or "printed," on the surface of an insulating board known as the substrate. Individual electronic components are placed on the surface of the substrate and soldered to the interconnecting circuits. Contact fingers along one or more edges of the substrate act as connectors to other PCBs or to external electrical devices such as on-off switches. A printed circuit board may have circuits that perform a single function, such as a signal amplifier, or multiple functions.
There are three major types of printed circuit board construction: single-sided, double-sided, and multi-layered. Single-sided boards have the components on one side of the substrate. When the number of components becomes too much for a single-sided board, a double-sided board may be used. Electrical connections between the circuits on each side are made by drilling holes through the substrate in appropriate locations and plating the inside of the holes with a conducting material. The third type, a multi-layered board, has a substrate made up of layers of printed circuits separated by layers of insulation. The components on the surface connect through plated holes drilled down to the appropriate circuit layer. This greatly simplifies the circuit pattern.
Components on a printed circuit board are electrically connected to the circuits by two different methods: the older "through hole technology" and the newer "surface mount technology." With through hole technology, each component has thin wires, or leads, which are pushed through small holes in the substrate and soldered to connection pads in the circuits on the opposite side. Gravity and friction between the leads and the sides of the holes keeps the components in place until they are soldered. With surface mount technology, stubby J-shaped or L-shaped legs on each component contact the printed circuits directly. A solder paste consisting of glue, flux, and solder are applied at the point of contact to hold the components in place until the solder is melted, or "reflowed," in an oven to make the final connection. Although surface mount technology requires greater care in the placement of the components, it eliminates the time-consuming drilling process and the space-consuming connection pads inherent with through hole technology. Both technologies are used today.
Two other types of circuit assemblies are related to the printed circuit board. An integrated circuit, sometimes called an IC or microchip, performs similar functions to a printed circuit board except the IC contains many more circuits and components that are electrochemically "grown" in place on the surface of a very small chip of silicon. A hybrid circuit, as the name implies, looks like a printed circuit board, but contains some components that are grown onto the surface of the substrate rather than being placed on the surface and soldered.
Wonderful PCB (HK) Limited, with over 15 years experience of producing PCB, fabricates printed circuit boards for customers in many industries worldwide, including communications/telecom/IT, medical electronics, consumer electronics (mobile phones, computers, LED lighting, etc.), and the automobile industry. We supply high-precision, high-density, double-sided and multilayer custom PCBs and PCBA services for customers in many countries.

About PCB service

1. Installation and welding of parts
the last step is the installation and welding the parts. Both THT and SMT parts use of machinery and equipment to install is placed on the PCB.
THT parts are usually called the Wave Soldering (Wave Soldering) way of welding. This allows all parts to a welding on the PCB.First to pin cut close to the board, and slightly bent so that parts can be fixed. Then the PCB will be moved to the co solvent on the waves of make contact to help at the bottom of the solvent, it can be on the base metal of the oxide to get rid of. After the heated PCB, the move to the melting of solder, at the bottom and contact after welding is completed.
Automatic welding of SMT parts way is called to flow back to welding (Over Reflow Soldering).Contains co solvent and solder paste in welding, the parts installed on the PCB after the first treatment time, was a PCB again after heating treatment. For PCB cooling after welding is completed, the next is to prepare the final test of PCB board.

2. Proofing
PCB's Chinese name is called printed circuit board, also known as printed circuit boards; printed circuit board is an important electronic component is electronic components support body? The provider of the electrical connection in the electronic components. Because it is made of so called electronic printing "printed circuit board.
PCB proofing is refers to the pilot production of printed circuit board before mass production is mainly used for electronic engineers in the design of circuit? And complete the PCB Layout to the factory after small batch trial-produce process is the PCB proofing. And PCB proofing production quantity generally no specific boundary is an engineer in product design has been finished to confirm and complete the test before we call it PCB proofing.

Flex circuits

Flex circuits are often used as connectors in various applications where flexibility, space savings, or production constraints limit the serviceability of rigid circuit boards or hand wiring. A common application of flex circuits is in computer keyboards; most keyboards use flex circuits for the switch matrix.
In LCD fabrication, glass is used as a substrate. If thin flexible plastic or metal foil is used as the substrate instead, the entire system can be flexible, as the film deposited on top of the substrate is usually very thin, on the order of a few micrometres.
Organic light-emitting diodes (OLEDs) are normally used instead of a back-light for flexible displays, making a flexible organic light-emitting diode display.
Most flexible circuits are passive wiring structures that are used to interconnect electronic components such as integrated circuits, resistor, capacitors and the like, however some are used only for making interconnections between other electronic assemblies either directly or by means of connectors.
In the automotive field, flexible circuits are used in instrument panels, under-hood controls, circuits to be concealed within the headliner of the cabin, and in ABS systems. In computer peripherals flexible circuits are used on the moving print head of printers, and to connect signals to the moving arm carrying the read/write heads of disk drives. Consumer electronics devices make use of flexible circuits in cameras, personal entertainment devices, calculators, or exercise monitors.
Flexible circuits are found in industrial and medical devices where many interconnections are required in a compact package. Cellular telephones are another widespread example of flexible circuits.
Flexible solar cells have been developed for powering satellites. These cells are lightweight, can be rolled up for launch, and are easily deployable, making them a good match for the application. They can also be sewn into backpacks or outerwear.

If you need expert flexible circuit board service, please contact wonderful02@wonderfulpcb.com.

Ball Grid Array

Stands for BGA Ball Grid Array (ball grid array structure PCB), which is an integrated circuit using an organic carrier board an encapsulation method. It has: ① Reduce encapsulation size ② Approve the function, pin count increased ③ PCB board dissolved welding self-centered. ④ high reliability and easy on the tin good electrical properties. ⑤ Low overall cost. BGA PCB board with small holes are more general, most customers BGA vias under design for the finished hole diameter 8 ~ 12mil, BGA paste it into the hole at the surface of the distance to specifications for 31.5mil for example, generally not less than 10.5mil. BGA vias required under the plug hole, BGA pads allow the ink, BGA pads are not bored.

BGA package I / O terminal or columnar joints in a circular distributed in a matrix form underneath the package, BGA technology has the advantage of I / O pin count despite an increase, but the pitch is not reduced but increased to improve assembly yield; although its power increased, but can controlled collapse chip BGA welding method, which can improve its electric performance; thickness and weight compared with the previous packaging technology has decreased; parasitic reduced, signal transmission delay is small, the frequency is greatly improved; assembly can be welded of high reliability. Speaking BGA package without mentioning Kingmax's patented Tiny BGA technology, Tiny BGA

  With the continuous development of science and technology, modern society is closely related with electronic technology, ultra-small mobile phones, ultra-small walkie-talkies, portable computers, memory, hard drives, optical drives, high-definition TV and so on miniaturization, light of the proposed stringent requirements. To achieve reach a goal, we must in the production process, component aspects depth study. SMT (Surface Mount Technology SMT) technology in tune with this trend, for the realization of electronic products, light, thin, short, small foundation.

SMT technology since the 1990s, to a mature stage, but with electronic products, according to the then type / miniaturization, networking and multimedia in the direction of the rapid development of electronic assembly technology put forward higher requirements, the new high-density assembly technologies are emerging, including BGA (Ball Grid Array BGA) is a has entered the practical stage of the high-density assembly technology. This paper attempts to assemble BGA device characteristics and quality control of solder joints to make a presentation.