What are the types and functions of small round holes on PCB?

What are the small round holes on PCB? Small round holes on PCB have various functions. In PCB design and manufacturing, small round holes are common and important elements. They are not just for beauty or ventilation, but carry various functions.

What are the small round holes on PCB?

The small round holes on PCB are mainly divided into drilled holes and via holes. These small holes achieve electrical connection by penetrating different layers of the circuit board, and may also be used for positioning, installation, heat dissipation and isolation.

Types of small round holes in PCB

1. Via Holes: To achieve electrical connection between different layers of the circuit board, including blind holes, buried holes and through holes.

2. Component Holes: Holes used to install and fix electronic components, depending on the package type and pin design of the components.

3. Positioning Holes (Fiducial Marks/Tooling Holes): Holes used to accurately position the circuit board during manufacturing and assembly.

4. Thermal Relief Holes: Used to improve the heat dissipation performance of the circuit board, especially suitable for high-power or high-density circuit design.

5. Test Points/Probe Points: Holes used to contact specific points on the circuit board during manufacturing and testing, which are convenient for test probes to contact.

6. Isolation Holes: Used to isolate different areas or signals on the circuit board to improve signal integrity.

7. Conduction Holes: Used for electrical connection between different conductive layers to ensure the reliability of the connection.

8. Mounting Holes: Used to fix the circuit board to other devices or structures, usually located around the circuit board or in a specific position.

The small round holes on the PCB have many important functions, from electrical connection to positioning, heat dissipation and isolation. Their diversity and functionality make circuit board design more flexible and reliable. For PCB design engineers and manufacturers, it is crucial to fully understand and utilize the characteristics of these small holes, which can help them design electronic products with superior performance and complete functions.

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