PCB Tech - Advantages, disadvantages and advantages of multilayer PCB

1. The advantages and disadvantages of multilayer circuit boards

The manufacturing method of multi-layer circuit boards generally starts with the inner layer pattern, and then uses the printing and etching method to make a single-sided or double-sided substrate, and incorporates it into the designated interlayer, and then heats, presses and bonds it. As for the subsequent Drilling is the same as the plated through-hole method of the double-sided board.

advantage:

High assembly density, small size and light weight. Due to the high assembly density, the connection between each component (including components) is reduced, so the reliability is improved

The number of wiring layers can be increased, thereby increasing the design flexibility; it can form a circuit with a certain impedance; it can form a high-speed transmission circuit; it can be equipped with a circuit, magnetic circuit shielding layer, and a metal core heat dissipation layer to meet shielding, heat dissipation, etc. Special functions are required; simple installation and high reliability.

shortcoming:

The cost is high; the cycle is long; high-reliability testing methods are required.

Multilayer printed circuit is the product of the development of electronic technology in the direction of high speed, multi-function, large capacity and small volume. With the continuous development of electronic technology, especially the extensive and in-depth application of large-scale and very large-scale integrated circuits

Multilayer printed circuits are rapidly developing in the direction of high density, high precision, and high-level digitalization. Technologies such as fine lines, small aperture penetrations, blind holes and buried holes, and high plate thickness to aperture ratios have emerged to meet the needs of the market.

Second, the advantages of multilayer circuit boards

The requirements for multilayer circuit board structure design and process production are very high, and the higher the number of layers, the more difficult it is. Suitable for use in more complex circuits. So what are the advantages of using multilayer circuit boards?

1. The advantages of using multi-layer boards are: high assembly density and small size; the connection between electronic components is shortened, and the signal transmission speed is increased; it is convenient for wiring; for high-frequency circuits, a ground layer is added to make the signal line to the ground A constant low impedance is formed; the shielding effect is good. However, the more layers, the higher the cost, the longer the processing cycle, and the more troublesome quality inspection.

2. From the perspective of cost, when comparing the cost of the same area, although the cost of a multi-layer circuit board is higher than that of a single-layer circuit board, if other factors such as the miniaturization of the circuit board and the convenience of reducing noise are taken into account, the multi-layer circuit board The cost difference between circuit boards and single-layer circuit boards is not as high as expected.

3. When simply calculating the area cost of the circuit board based on the data we know, the area of the double-layer circuit board that can be purchased by the daily yuan is about 462mm2, and the area of the 4-layer circuit board is 26mm2, which means that the same circuit is designed, if The use area of the 4-layer circuit board can be reduced to 1/2 of the double-layer board, and the cost is the same as that of the double-layer circuit board.

4. Although the multi-layer batch will affect the unit area cost of the circuit board, there is still not a 4 times price difference. If a price difference of more than 4 times occurs, as long as you can try to reduce the use area of the circuit board, and try to reduce it to a double-layer board Less than 1/4 of that is enough.