Classification by function:
1. interconnection: providing mechanical and electrical connection/disconnection, consisting of connecting plugs and sockets, and interconnecting cables, brackets, cabinets or other PCBs; However, the actual connection with the circuit board must be through surface mount contact.
2. Active electronic components: In analog or digital circuits, you can control the voltage and current yourself to produce gain or switching effect, that is, you can change your basic characteristics in response to external signals.
3. Passive electronic component: When an electrical signal is applied, it does not change its own characteristics, that is, it provides a simple and repeatable response.
4. Odd shape: Its geometric factor is strange, but not necessarily unique. Therefore, it must be installed by hand, and its shell shape (in contrast to its basic function) is not standard, such as many transformers, mixed circuit structures, fans, mechanical switch blocks and so on.
Extended data
During the Tenth Five-Year Plan period, the development of China's electronic materials industry grew steadily, and the total industrial output value (sales revenue) of the whole industry was about 55 billion yuan, accounting for 1.3% of the total sales of the information industry. Among them, copper clad laminate materials, magnetic materials and semiconductor materials are about 47 billion yuan, and the total export value is nearly 2.5 billion US dollars.
China's electronic materials industry has made certain achievements in various fields after the development of the Tenth Five-Year Plan, which laid a good foundation for the development of the Eleventh Five-Year Plan.
After China's entry into WTO, economic globalization and users' adoption of imported materials have a great influence on the development of domestic electronic materials. Due to the weak foundation of electronic materials, less technological research and development achievements and original intellectual property rights, key enterprises lack effective state support and are unable to solve major problems in the industry.
For example, the domestic large-scale production technology of polysilicon raw materials has not yet been mastered, and there are no large-scale production enterprises so far; High-end products such as piezoelectric crystals, magnetic materials and electronic ceramic materials have yet to be developed. However, China's electronic materials industry has entered a period of rapid development, and risks and opportunities coexist.
Baidu encyclopedia-electronic materials