PCB Technical - How to distinguish good or bad PCB circuit board?

PCB circuit board With the rapid development of the mobile phone, electronics, and communication industries, it has also promoted the continuous growth and rapid development of the PCB circuit board industry. People have higher and higher requirements on the number of layers, weight, precision, materials, colors, and reliability.

However, due to fierce market price competition, the cost of printed circuit board materials is also on the rise. More and more manufacturers monopolize the market through low prices to enhance their core competitiveness. However, these ultra-low prices are obtained in order to reduce material costs and process production costs, but the equipment is often prone to cracks (cracks), scratches (or scratches), and its accuracy, performance and other comprehensive factors do not meet the requirements. standard. Seriously affect the solderability and reliability of the product.

Faced with various printed circuit boards on the market, there are two ways to distinguish the quality of printed circuit boards. One is to judge from the appearance, and the other is to judge from the quality specification requirements of the PCB board itself.

How to judge the quality of PCB circuit board:

First: distinguish the quality of the circuit board from the appearance

Generally speaking, the appearance of PCB circuit board can be analyzed and judged from three aspects.

1. Standard rules for size and thickness.

The thickness of the circuit board is different from that of the standard circuit board. Users can measure and check according to the thickness and specifications of their own products.

2. Light and color.

The external circuit board is covered by ink, and the circuit board can play an insulating role. If the color of the circuit board is not bright and the ink is low, the insulating board itself is not good.

3. The appearance of the weld.

Due to the large number of parts, if the soldering is not good, the circuit board that is easy to fall off will seriously affect the soldering quality of the circuit board. It is very important that the appearance is good, the identification is careful, and the interface is strong.

Second: High-quality PCB circuit boards need to meet the following requirements

1. After installing the components, the telephone should be used, that is, the electrical connection should meet the requirements;

2. The width, thickness and distance of the circuit meet the requirements to avoid heating, open circuit and short circuit of the circuit.

3. It is not easy to fall off the copper skin under high temperature.

4. The copper surface is not easy to oxidize, which affects the installation speed. It will be damaged soon after oxidation.

5. No additional electromagnetic radiation;

6. The shape is not deformed, so as to avoid the deformation of the shell and the dislocation of the screw holes after installation. Now it is mechanized installation, and the circuit board position and circuit deformation error and design should be within the allowable range;

7. High temperature, high humidity and special environmental resistance should also be considered.

8. The mechanical properties of the surface should meet the installation requirements;

The above is the judgment method of PCB circuit board. When choosing to buy PCB circuit board, be sure to wipe your eyes.