Although there is some confusion in the classification of the connector product type, there are only two basic ways to classify the connector product categories from the technical point of view: ① According to the shape and structure: round and rectangular (cross section); ② According to the working frequency: low frequency and high Frequency (3MHz for the community).
In accordance with the above division, the coaxial connector is circular, printed circuit connectors are rectangular (historically, the printed circuit connector is indeed isolated from the rectangular connector into a category), and currently popular Rectangular connector section of trapezoidal, similar to the rectangle. Divide the frequency division of low frequency and high frequency and radio wave with 3MHz as the boundary and basically the same.
As for other uses, installation methods, special structures, special features and so on can also be divided into many different types, and often appear in publications and manufacturers of promotional materials, but generally only to highlight a particular feature and purpose, the basic classification is still Did not exceed the above principle of division.
Taking into account the technical development of the connector and the actual situation, from its versatility and related technical standards, the connector can be divided into the following categories (sub-categories): ① low-frequency circular connectors; ② rectangular connectors; ③ printed circuit Connector; ④ RF connector; ⑤ fiber connector.
The development of the connector should be miniaturized (due to the smaller and lighter development of many products, the requirements of pitch and appearance size and height have certain requirements, and the requirements of the product will be more precise, such as the wire-to-board The best choice of small spacing 0.6mm and 0.8mm), high-density, high-speed transmission, high-frequency direction. Miniaturization refers to the connector center spacing smaller, high-density digital core is to achieve. High Density PCB (Printed Circuit Board) Connectors The total number of effective contacts reaches 600 cores and special devices up to 5000 cores. High-speed transmission refers to the modern computer, information technology and network technology requirements of signal transmission time-scale rate up to MHz band, pulse time to sub-millisecond, thus requiring high-speed transmission connector. High frequency is to adapt to the development of millimeter wave technology, RF coaxial connectors have entered the millimeter wave frequency band.