What is Clearance Hole
A clearance hole is a hole in the conductive pattern of the PCB that is intentionally larger than, and concentric with, a hole in the base material of the board. This design allows for proper alignment and clearance between components or other elements on the PCB.
A clearance hole’s purpose is to ensure enough space for components or other elements to fit properly without any interference or contact with the conductive pattern or other surface elements on the PCB. By having a larger diameter than the hole in the base material, the clearance hole provides a buffer zone, preventing any potential short circuits or unwanted connections.
The size of a clearance hole is typically specified in terms of its finished hole size, which is the minimum diameter required. Additionally, the edge-to-edge clearance is specified, which is the minimum distance required from any other surface element. These specifications are crucial in ensuring the proper functioning and reliability of the PCB.