The difference between through-holes, buried holes, and blind holes in printed circuit boards

In electronic circuits, circuit boards are the connecting medium between electronic components. In the manufacturing process of circuit boards, three different types of holes are often involved, namely blind holes, through holes, and buried holes. Understanding the differences between these three types of holes is crucial for understanding the manufacturing and maintenance of circuit boards.

First, let's introduce blind holes. Simply put, blind holes only connect one layer of the printed circuit board and cannot be connected to the other side. Blind holes are often used for single panel or outer circuit board assembly.

Through hole. A through hole is a hole that passes from one side of a printed circuit board to the other. This type of hole can connect multi-layer of printed circuit boards.

Buried hole. It refers to the connection between any circuit layer inside a printed circuit board (PCB), but without conduction to the outer layer, that is, without conduction holes extending to the surface of the circuit board. Buried holes are commonly used in multi-layer boards, and their biggest advantage is that they can greatly simplify the design and manufacturing process of circuit boards, while also reducing the burden on circuit boards.

In summary, blind holes, through holes, and buried holes all have their own advantages and disadvantages, and different hole types may have specific usage scenarios in specific situations. Mastering the differences and characteristics of these holes helps to select appropriate types of circuit board holes, thereby improving the performance and reliability of the printed circuit board.