High-Quality Double sided PCBs with Competitive Pricing
What is a Double sided PCB
Double sided PCBs are printed circuits with two copper layers with a dielectric in the middle. Plated holes connect the top copper and the bottom copper layer. The dielectric be CEM1, CEM3, FR4, high TG FR4, high speed, high-frequency material, ceramic, polyimide, PTFE or other materials.
Although many very high technology and high layer count PCBs are used more frequently. But double sided PCB still takes the most significant proportion because of its high cost-effectiveness. Here in Viasion, we are very good at producing high-quality and cost-effective double-layer printed circuits.
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Why Choose Viasion as Your Double sided PCBs Supplier
Double sided PCB's Foundation and Characteristic
- The definition of a double-sided circuit board is just like its name. Unlike a single-sided board, it has upper and lower layers, and components can be assembled on both sides, while the link between the two-sided circuits is through Via. Viasion defines a double-sided board in this way.
- As mentioned in the previous paragraph, the lines on both sides need to be connected. This kind of connection used to connect the lines on both sides is called the Via, an indispensable bridge to ensure the work of the double sided PCB board. It is presented on the circuit board as a small hole.
- The inner wall of the hole will be covered with metal to connect the circuit. This Via also joins both sides of the double sided PCBs. Both are indispensable essential components of double-sided circuit boards.
- Like the name of the double sided PCB board, it consists of two layers, the top layer and the bottom layer, which copper covers. Like the single-sided board, the double-sided board is also one of the most common circuit boards.
- For the basic principle of the double-sided circuit board, the bottom layer and top layer can be connected through vias, as mentioned above. They can also be connected with pads, and both have conductive patterns. The double layer design is more convenient and diverse than a single panel because both sides can be wired, and the application range is more extensive.
- A double panel has more advantages in some features than a single panel. As mentioned, the double-sided PCB is wired on both sides and connected by vias. Under this feature, The overall operable area is much larger than that of a single panel, significantly improving the upper limit of performance.
- Thus, the double-sided circuit board solves the problem of single-panel wiring design difficulties. Therefore, as the upgrade and upper replacement of the single panel, the double-sided board is applied to more complex fields and designs.
- In addition to the composition and characteristics of the foundation, the manufacturing method of double-sided panels has mostly stayed the same as that of the 1960s in terms of process and method.
- However, due to the development of other fields, such as materials science and manufacturing technology, which are becoming more mature and novel, double-sided panels have more diversity in characteristics than the previous single-sided panels. Therefore, they apply to more and more products and fields.
Double sided PCB's Advantages
In the circuit board field, there is no absolute good or bad. What is more important is understanding the product and the design of the wiring. It is best to ensure the product’s functionality and stability while minimizing the cost.
Viasion has accumulated rich experience in this field. In addition, with the development and progress of society and technology, technological ability, manufacturing ability, and material science have developed rapidly, including double sided PCB design ability. Therefore, there are more and more applications of double sided PCBs. The advantages of double-sided PCB boards are mainly described by comparing them with single-panel and multi-layer boards.
For example, a single-sided board has only one side, while a double-sided circuit board has two sides that can be wired and connected by copper. Therefore, in the design of wiring, the double-sided board has apparent advantages and can be designed more complexly to meet the final effect of the product.
On the other hand, the double-sided PCB has more advantages and convenience regarding material and technology. And in terms of copper coating, double-sided panels are also more advantageous because there are two sides, so there is one more side of copper coating than single-sided panels. Furthermore, in assembling the single-sided board, only one side can be welded due to the limitations of the single-sided panel, but both sides of the double-sided PCB board can be welded.
The double panel has more lines than the single panel, making the running capacity larger and the relative running speed faster, thus improving the performance more than the single panel.
Better quality. The double-sided panel is more complex than the single panel, so better materials and technology are used in many aspects. The complex circuit supports more components, bringing better performance, and higher technology is needed to design and make it inclusive. All these make the quality of the final product better.
Better durability and more layers bring more thickness. Therefore, in terms of primary materials, double-sided panels have many advantages over single-sided panels, and better substrates also make circuit boards more resistant to accidents and harsh environments. So ultimately, their life is better than single-sided panels.
Portable. More layers can also compress the size further because the capacity is significantly increased under the same area, and the design can be compressed together to make the size smaller. Therefore, in standard single-panel products, it can be found that the surface base of a single-panel is often much larger than that of double-sided and multi-layer boards.
As the preface said, circuit boards could be better or better. We should find the most suitable materials and designs according to product characteristics. The advantages of multilayer boards are apparent. More layers can meet more complex designs, but a good design can make double-sided circuit boards more cost-effective while meeting product requirements.
Although the double-sided PCB is less complicated than the multi-layer board, it is more concise and intuitive.
Double sided PCBs Manufacturing Process Flow
Nowadays, most PCB assemblies of advanced electronic products (computers and telecommunication products) are manufactured by the way of SMT assembly. The following industries are some examples of the uses of SMT assembly.
Cut into workpieces (PNL) according to the material and size required by MI.
Viasion is very experienced in this area. The primary materials include copper-clad laminate, backing plate, aluminum sheet, prepreg and copper foil.
Make positioning or alignment holes for internal wire machining.
Based on Viasion’s experience, the Sandwich production +CCD shooting method can also be used.
Coating photosensitive wet film or pasting photosensitive dry film on the cleaned copper clad board, Viasion is very experienced in this area, and then transferring the circuit pattern on the film master plate to the copper clad board through “photochemical pattern transfer”.
Based on Viasion’s experience, the main steps: grinding plate→printing wet film (attaching dry film)→film alignment→exposure→developing→line picking.
Inner layer blackening: the purpose of blackening:
A． Enhance the roughness of the surface of the inner copper foil, thereby improving the bonding force between the epoxy resin and the inner copper foil.
B． Viasion is very experienced in this area. Therefore, a dense passivated copper layer is formed on the bare copper surface to reduce the adverse oxidation or other pollution of the copper surface caused by the amines in the liquid resin under high temperature and high-pressure conditions during lamination.
The copper foil (Copper Foil), PP film (Prepreg), and the inner layer circuit board, after blackening treatment (Oxidation), are pressed into a multi-layer board by hot pressing and then drilled and copper-immersed after lamination. Based on Viasion’s experience, the electrical interconnection between layers can be realized.
The conventional laminated structure uses PP between the outer layer and the second outer layer.
Let me introduce PP: PP is also called prepreg. Viasion is very experienced in this area. The resin in the film is in a semi-hardened gel state. It will soften and flow again after being exposed to high temperatures. Large and fully hardened, thus bonding each layer of core board and outer layer of copper foil.
Copper foil and PP are rolled individually, and the sheet core is a piece of material. The copper foil has 1/3OZ, 1/2OZ, 1OZ, 2OZ, 3OZ, 4OZ, etc., PP has 7628, 2116, 1080,106,3313 etc.
After lamination, enter the outer layer of mechanical drilling.
Outer drilling:
Drill the hole required by the customer on the sheet. Based on Viasion’s experience, the hole’s position and size must meet the customer’s design requirements.
Realize the channel for electrical interconnection between layers, and prepare for subsequent component insertion and welding.
Coating photosensitive wet film or sticking photosensitive dry film on the cleaned copper clad board, Based on Viasion’s experience, and then transferring the circuit pattern on the film master plate to the copper clad board through “photochemical pattern transfer”.
Main steps: grinding plate→printing wet film (attaching dry film)→film alignment→exposure→developing→line picking
Viasion is very experienced in this area. The electroplating principle is used to electrodeposit a metal layer on the effective line to thicken the plate surface and the coating in the hole to meet the customer’s electrical performance requirements (hole copper 20-25UM).
Graphic plating includes copper, tin, nickel, and gold plating.
Use sodium hydroxide solution to strip off the anti-corrosion or anti-plating oil film on the board surface to expose the copper surface.
Solder mask process, the role of solder mask:
Anti-soldering: Reserve the through-holes and pads to be soldered on the board. Viasion is experienced in this area and covers the remaining lines and copper surfaces to prevent short circuits caused by wave soldering and save the amount of soldering tin.
Protective plate: Viasion is experienced in this area, prevents moisture and electrolytes, and protects the circuit.
Insulation: As the line width and spacing of the board become finer and finer, Viasion is very experienced in this area, and the insulation problem between conductors is becoming more and more prominent. Printing solder mask also increases their insulation.
Appearance: Forms a beautiful “coat” for printed boards.
Coating solderable coating on the bare copper surface of the PCB protects the copper surface and meets the customer’s surface welding requirements.
Finally, the products are packed into storage. Based on Viasion’s experience, The shipment reports provided to customers include the following:
- Product test reports.
- Shipment inspection reports.
- Slicing and slicing reports.
- Coating/coating (gold thickness) test reports.
Viasion is very experienced in this area, environmental protection test reports, impedance strips and impedance test reports, English reports, sample Letters of acknowledgement and other special requirements reports, etc.
Viasion will first review the data, ensure the integrity of the production documents, and evaluate whether the production of the circuit board exceeds the company’s production capacity. After the review is completed and the production is confirmed to be OK, it will start the next step of the standard output.
Then the production documents will be transferred from the business to the engineering department to make the working Gerber. Then the engineering department will summarize the EQ during production and confirm with the customer. After the EQ and the customer are connected and confirmed, formal production will begin.
After completing the above, we will enter the formal production, showing the preparation of the film. The film is a negative film in the camera. After entering the project file, draw the drawing on the film against the project file, and then transfer the drawing to the board through unique materials.
Conclusion
With the development of society, double-sided panels play an increasingly important role.
The double-sided PCB board is in a very suitable position. The single-sided board’s cost is slightly higher, but it can extend a lot of functionality in the design. A lower price can be achieved through good double sided PCB design for the multi-layer board. To achieve the same functionality, the application of double-sided panels will become increasingly popular.
Viasion has accumulated a lot of experience in the production of double-sided panels and has excellent manufacturing capabilities, from consumer electronics to industrial electronics and aerospace, including military products. We have a wealth of cooperation experience.
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Frequently Asked Questions
A double-sided PCB is a circuit board with routing on both sides of the board. An essential feature of a double-sided circuit board is that it can connect the routing on both sides into a circuit with vias.
A single-sided PCB is a circuit board with only one routing layer, while a double-sided PCB has two routing layers and vias in the middle.
Resistors, capacitors, transistors, and integrated circuits (ICs) can be mounted on a double-sided PCB board.
The following steps describe the manufacturing process of double-sided PCBs.
Cutting → Drilling → Plated through hole → Panel plating → Pattern → Pattern plating → Etching → Solder mask → Silkscreen → Surface finish → V-cut → Testing&inspection → Packaging
Two layer PCBs can also be called dual layer PCB, it means there are two conductive copper layers. Double-sided PCBs also means circuit boards with two copper layers. So two layer PCB and double sided PCB board are the same.
Double-sided PCBs are more suitable for complex circuits and are used in broader applications.
The manufacturing cost of double-sided circuit boards is moderate, and the application area is wide.
The performance and stability of double-sided PCB boards are better than single-sided PCBs.
The most significant disadvantage of a advantages of double sided PCB is the increased complexity in design and layout.
Double-sided PCBs also increase cost due to increased complexity and require additional care in handling as components attach to both sides of the board.
Double-sided PCB boards may also be more challenging to repair or modify if needed.
The standard design is power + signal on the surface; ground + signal at the bottom. Power and ground can be used to cross bus structures and also be used in the form of a large area of copper, depending on the actual alignment space.
There is a better design idea. First, each layer is under the single panel design requirements to achieve. Then further adjust the optimization, such as thickening the power/ground, the spare area of large copper, etc.
Double-sided PCBs are only sometimes suitable for high-speed applications due to their inherent drawbacks. For example, they inherently need more density and the number of layers required to effectively route high-speed signals, making them less ideal for such applications.
Double-sided circuit board are the most widely PCBs because they are cost-effective and reliable. So double-sided PCBs are used in most of the industry area, such as consumer electronics, industry, telecommunications, wireless and wifi, IoT, robotics, power and energy, automation and control, medical, testing and measurement, automatic, aerospace, military etc.
Yes, sides manufacturing of double-sided board, we also assembly 2 layer printed circuit boards.
Yes, double sided PCB board are the most widely used one in the electronic industry. The advantages of double sided PCB are:
1, Double sided PCB design can meet the functional requirement for most boards;
2, Double sided copper clad board are cost effective;
3, Double-sided circuit board is easy for PCB manufacturer to produce;
4, Double layer PCB are very reliable.
