School of packaging

Challenges and opportunities coexist: a comprehensive analysis of COB packaging technology

COB packaging is an advanced integrated circuit packaging technology, where COB stands for "Chip On Board", literally meaning "chip directly on the printed circuit board". COB packaging technology connects a semiconductor chip directly to a printed circuit board (PCB), which is then packaged with an epoxy resin to protect the chip. This technology has a wide range of applications in many fields, including automotive electronics, medical devices, consumer electronics, and more.

Advantages of COB package:

Small size: COB packaging technology omits the traditional plastic packaging process, making the entire package structure greatly reduced, providing the possibility for miniaturization and lightweight products.

High performance: Because the chip is directly connected to the PCB, the thermal resistance is low, and the thermal dispersion performance is excellent, which is conducive to the stable operation of the chip.

High reliability: COB package can effectively protect the chip, resist environmental humidity, temperature changes and other factors, improve the reliability and durability of the product.

Strong flexibility: COB package can be flexibly designed according to the specific requirements of the product package structure and size, providing greater design freedom.

Cost-effective: Compared with traditional packaging methods, COB packaging can reduce manufacturing costs and improve production efficiency.

However, COB packaging technology also has some disadvantages:

Maintenance is difficult: Once the product fails, it is very difficult to repair. Because the chip is firmly packaged in epoxy resin, it is difficult to maintain the chip without damaging it.

High technical requirements: COB packaging requires precise packaging equipment and a high level of technical capability to ensure package quality and reliability.

Susceptible to moisture: While the COB package can protect the chip, the epoxy resin is more sensitive to humidity and may cause the package to fail if used in an environment with higher humidity.

Electromagnetic interference issues: Since the chip is in direct contact with the PCB, electromagnetic interference can be more serious and additional measures need to be taken to prevent electromagnetic interference.

Although COB packaging technology has some disadvantages, its advantages make this technology more and more widely used in the electronic product manufacturing industry. Especially in the manufacture of small volume, light weight, high performance of modern electronic equipment, COB packaging technology plays an important role.

For electromagnetic interference problems, electronics engineers usually consider this problem at the design stage, by optimizing the circuit design and adding electromagnetic shielding measures to reduce electromagnetic interference. In addition, some high-performance epoxy resins can provide better moisture resistance, which can solve the problem of COB packaging susceptible to moisture.

Overall, COB packaging is a very effective packaging technology that provides a miniaturized, high-performance and highly reliable solution. However, it also requires high technical requirements, as well as consideration of environmental conditions. Therefore, when choosing to use COB packaging technology, it is necessary to weigh its advantages and disadvantages according to the specific requirements of the product and the use environment.

In the future, with the continuous development of packaging technology, COB packaging may be more perfect, its advantages will be further played out, and the shortcomings may also be improved. For example, new epoxies may provide better moisture resistance and electromagnetic shielding. More precise packaging equipment and more advanced packaging technology may also reduce the manufacturing cost of COB packaging and improve its production efficiency. Therefore, COB packaging technology still has a broad application prospect in the future electronics manufacturing industry.