In the microcosm of modern electronic devices, there is a seemingly inconspicuous component that plays a core role – PCB printed circuit board. This board, loaded with delicate circuits and various components, serves as a bridge connecting electronic components, ensuring that current can accurately shuttle between various components. Today, we will unveil the mysterious holes on PCB circuit boards, understand their names, and the important role of drilling technology in achieving circuit board functions.

Hole types on PCB circuit boards

The holes on PCB circuit boards can be roughly divided into three types: through holes, blind holes, and buried holes.

Through hole: This is the most common type of hole that runs through the entire circuit board, allowing component pins to pass through one side of the board and the other. It is commonly used for installing traditional through hole components that require manual soldering. The use of through-holes simplifies the installation process of components and enhances the mechanical connection strength between components and circuit boards.

Blind hole: This type of hole only extends from one or both sides of the circuit board to the internal conductive layer, but does not penetrate the entire board. Blind holes are mainly used in the design of surface mount technology (SMT) multilayer boards, connecting the surface and an internal layer to save space, improve the density and complexity of circuit boards.

Buried hole: The buried hole is completely located inside the circuit board and is not connected to any external side. They are mainly used for connecting internal layers in multi-layer boards, improving circuit integration and signal transmission efficiency, while maintaining the cleanliness of the circuit board surface.