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Categories and definitions of industrial connectors


There is no unified classification standard for connectors so far. New application fields are constantly appearing, and the structure is becoming increasingly diversified. It is difficult to use a fixed pattern to classify and name. Nevertheless, some basic classification principles are still valid, let's first understand the prerequisites for connector classification.

1. According to the functions of the internal and external connections of electronic devices, the interconnection levels are divided into 6 levels:
The first layer: the interconnection of components to the package;
The second layer: the interconnection of the package to the circuit board;
The third layer: board-to-board interconnection;
The fourth layer: component-to-component interconnection;
The fifth layer: the interconnection of the components to the input and output interfaces;
The sixth layer: system-to-system interconnection.



Rectangular Connectors - Adapters

2. According to the structure classification: board-to-board connector, board-to-line connector, line-to-line connector.

3. Connector product category
Although the division of connector product types is somewhat confusing, from a technical point of view, there are only two basic divisions of connector product categories: ①According to the shape and structure: round and rectangular (cross-section), ②According to the operating frequency: low frequency and high Frequency (with 3MHz as the boundary).
According to the above division, the coaxial connector belongs to the circular connector, and the printed circuit connector belongs to the rectangular connector (historically, the printed circuit connector is indeed separated from the rectangular connector). The current popular rectangular connector has a trapezoidal cross-section, which is approximately rectangular. The frequency division of low-frequency and high-frequency and radio waves based on 3MHz is basically the same.


Fiber Optic Connectors - Adapters

As for other types, it can be divided into many different types according to use, installation method, special structure, special performance, etc., and they often appear in publications and manufacturer's promotional materials, but generally only to highlight a certain feature and purpose, the basic classification Still does not exceed the above-mentioned division principle.
Taking into account the technical development and actual conditions of the connector, from its versatility and related technical standards, the connector can be divided into the following categories (sub-categories): ① low-frequency circular connector; ② rectangular connector; ③ printed Circuit connector; ④RF connector; ⑤Optical fiber connector.

4.The definition of connector in our country.
In my country's industry management, connectors, switches, keyboards, etc. are collectively referred to as electrical plug-in components, while electrical plug-in components and relays are collectively referred to as electromechanical components.