Pin header is a common electronic connector, also known as pin connector. It consists of a series of metal pins, usually in a cylindrical shape. Each pin plugs into an insulating base or connector housing and makes the connection to an external device.

The structure of the pin header connector is as follows:

Pins: Each pin is an independent metal lead that connects to a pin or socket on another device or module. They can make physical contact with the metal contacts of a circuit board to transmit current, signals, or power.
Insulating base: The pins of a header connector are inserted into an insulating base or connector housing. This base is usually made of an insulating material that prevents shorts between pins while providing stable support and positioning.
Spring or elastic contact piece: The pins of a pin header connector are usually connected to the insulating base through a spring or elastic contact piece. This design ensures good electrical contact and provides some damping and stability to reduce mechanical stress during insertion and extraction.
The working principle of a pin header connector is to connect and disconnect circuits by inserting and removing pins. When a connector is inserted into a circuit board or other device, physical contact is made between the pins and their corresponding pins or sockets, thereby transmitting current, signals, or power. By pulling out the connector, these physical contacts are broken, completing the disconnection.

The main function of the pin header connector is to provide a reliable electrical connection, allowing the circuit board to be connected to other devices. They are often used in the design of electronic products, such as computers, mobile phones, TVs, etc., to achieve power connection, signal transmission or data transmission. The modular design of the pin header connector makes connection between circuit boards and screen replacement more convenient, and allows quick plug-in and unplug operations. In addition, pin header connectors provide a simple and reliable way to connect circuit boards to external devices such as sensors, displays, or other modules.