In our daily lives, we can see electronic products everywhere. As a digital electronics enthusiasts, we all know that electronic products can operate, inside are a motherboard, the motherboard is covered with a variety of sizes, rules of different sizes of electronic materials, then the motherboard professional term called PCBA. through smt and DIP processing made, and covered with green or blue or red board, the industry's professional term called PCB, today we will give you the SMD processing industry, pcb different board layers of the difference and role.
A functional board, must be made after SMT and dip processing, the bare board is a PCB, and dissatisfied with the components of the board is called PCBA. PCB is also a kind of electronic components, but PCB is like building a house foundation, and different PCB also has a different number of board layers, usually 2 layers, 4 layers, 6 layers, 8 layers, 16 layers, 32 layers, etc., some Complex pcb may have tens of hundreds of layers, this pcb in the daily consumer electronics products is more difficult to see, we see in our daily lives the board is basically 4-layer and double-layer. Today, we will explain the 4-layer and double-layer PCB board.
How to identify at a glance is a multilayer board or double-layer board
Methods
1. multilayer board circuit connection is through the buried hole and blind hole technology, 4-layer board is the first, the fourth layer alignment, the other layers of ground and power.
2. Through the hole to identify, or use a flashlight to shine below, look at the reflection of the hole above, multilayer board inside the empty but not through the light out.
3. Look at the PCB top and bottom layers between the layers, the middle of two layers is a four-layer board, the middle of four layers is a six-layer board.
Why is the number of layers of pcb more even layers?
1. The core board is generally double-sided copper cladding.
2. If you want to do an odd number of layers, it is non-standard lamination, odd-layer PCB processing costs are significantly higher than the even-layer PCB, the same processing costs of the inner layer; but significantly increase the processing costs of the outer layer.
3. large size of the single layer warpage is easy to exceed the standard, so processing is carried out in accordance with the even number of layers, even number of layers easier to control the board bending.
4. If you do odd layers, you need to increase the ground layer, so the signal integrity is not good.
Double-layer board and 4-layer board advantages and disadvantages
Double-layer board and 4-layer board who is superior and who is inferior is not good to compare, this according to the actual needs to determine;.
Four-layer board is based on the double-layer board and then pressed together, pressed together when the two sides of the double-layer board were added PP and copper foil, and then pressed into a 4-layer board after high temperature and pressure, four-layer board has an inner layer, while the double-layer board does not have an inner layer, four-layer board wiring density is reduced, wiring easier, but heat dissipation is reduced, the price increases, while the double-layer board directly cut the board material can be made after drilling.
Therefore, the double-layer board is relatively simple, lower cost, more suitable for use in simple products, while the multilayer board is more expensive to produce, the cycle is longer, for more complex, requiring higher reliability of electronic products.
