PCB Technical - The main points of choosing PCBA substrate type?

What are the commonly used types of PCBA substrates.

1, FR-4 board is an epoxy board with high mechanical and dielectric properties, good heat resistance and moisture resistance, and good machining properties.

2. The aluminum substrate is a metal-based copper clad laminate with good heat dissipation function. Generally, a single panel is composed of a three-layer structure, which is a circuit layer (copper foil), an insulating layer and a metal base layer. Aluminum substrates are often used in LED lighting products. There are two sides, the white side is for soldering the LED pins, and the other side is the natural color of aluminum. Generally, the thermal conductive paste will be applied to contact with the hot part of the PCB factory.

3. The FPC board is made of polyimide or polyester film as a substrate with high reliability and excellent flexibility. It has high wiring density, light weight, thin thickness, and bending. It has good foldability and is used in high-end products such as mobile phones and hard disk drives.

PCBA is the core of electronic products, just like the position of the Chinese military when the three armies are playing against each other. The reliability, ease of use and stability of products are closely related to the quality of PCBA. Therefore, in the process of purchasing PCBA, we need to pay attention to PCBA urgently. PCBA quality control point, using a professional eye to examine whether each PCBA board meets the application requirements of electronic products.

1. The reliability of PCBA component welding. The reliability of PCB circuit board and component welding directly determines the performance of electronic products during use. With the in-depth use of the product, the circuit board suffers from oxidation, heat radiation, drop and super Harsh conditions such as load usage will cause the OK PCBA board to show welding problems when leaving the factory, and the product will fail.

In addition, whether to use brand original components in PCBA processing is also very important to the quality of electronic products. Many second-hand or counterfeit components will explode and fail when used for a long time. PCB circuit boards are still the same. According to the application environment of the product, to prevent the deformation of the PCB and the influence of heat, these factors need to be taken into consideration when purchasing the PCBA and undergo rigorous testing.

2, PCBA aging test performance report.

In large quantities, strict aging tests are required to test the stability and reliability of PCBA boards with extremely strict conditions. Many companies omit this step in order to save costs. As a result, batch products are defective in customer hand chip factories. It will cause greater losses. Therefore, when purchasing PCBA, it is recommended to put forward aging test requirements for bulk products, configure aging test fixtures and require suppliers to provide aging test performance reports.

3, PCBA assembly process management.

The assembly process of PCBA board and shell, packaging is also more important. Many assembly processes are not handled properly, which will also cause damage to the soldered components on the PCBA board that has been tested and cause defects after assembly. The assembly process of PCBA suppliers requires strict operations. Instructions, and supervise the workers to complete the procedures in accordance with the procedures.