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PCB board sizes and shapes can vary depending on the specific requirements and constraints of the application. Here are some common PCB board sizes and shapes:

Rectangular

Rectangular PCBs are the most common shape. They can range from small sizes like 1 inch by 1 inch (25mm x 25mm) for compact circuits to larger sizes like 12 inches by 18 inches (305mm x 457mm) for more complex or expansive designs.

Square

Square PCBs have equal side lengths and are often used when space is limited or for specific applications where a square shape is desirable. Square PCBs can range in size from small to large, depending on the requirements.

Circular

Circular PCBs have a round shape and are typically used for specialized applications or specific design requirements. They can vary in diameter, ranging from a few millimeters to several inches.

Custom Shapes

PCBs can be designed in various custom shapes to fit specific enclosures or accommodate unique mechanical requirements. Custom shapes can include irregular polygons, curved edges, or cutouts for specific components or connectors.

Panelized

In some cases, multiple smaller PCBs may be combined into a larger panel for efficient manufacturing and assembly. Panelization helps optimize the fabrication and assembly processes, especially for mass production.

It's important to note that the size and shape of the PCB should be determined based on the specific requirements of the circuit and the available space in the intended application or system. Factors such as the number and size of components, available enclosure or system space, and any mechanical or electrical constraints should be taken into account when deciding on the PCB board size and shape. Additionally, it's recommended to consult the manufacturer's capabilities and specifications to ensure that the desired size and shape can be manufactured effectively.