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What is the standard thickness of PCB?

In the 20th century, the standard PCB was defined from the plate frame until Albert Hansen invented flat and dirty conductors with multiple layers of insulation. The design of these boards is very simple. There is only one board with many layers. Today's PCBS are either single-sided (a copper layer), double-sided (a substrate layer between two copper layers), or multi-layered (layers of a double-sided PCB).

Typical PCB thickness is 0.063 inches or 1.57mm; It is the level of standardization defined in the past. This is because, in the plywood industry, 0.063 "is the thickness of the plywood used as the substrate for electronic equipment (including PCB).

When multilayer PCB boards begin to develop, the thickness of the connectors between the boards must match. Therefore, the thickness level becomes an important variable, and there is a standard level of copper as the laminate edge. In turn, 0.063 inches becomes the standard PCB thickness.

However, the normal thickness ranges from 0.008 inches to 0.240 inches, depending on the application or usage area. Therefore, you must communicate the requirements for the appropriate PCB thickness size.

1.1 PCB thickness
The width of the plate depends on the content of the insulating layer and its material. In the early development of PCBS, their layers, tops and bottoms were all made of bakelite with a thickness of 0.0065 ".

Over time, people began to use better substrates than plywood. For example, epoxy or paper reinforced phenolic resins are used as the base material between copper foil layers. Therefore, the use of lighter materials, in addition to the lack of use of edge connectors, cardboard thickness is sometimes less than 0.0065 ".

1.2 PCB copper thickness

As the master of PCB function and application field, copper thickness plays an important role in realizing the standard thickness of PCB. It is usually one ounce (ounce) in size. This is achieved by spreading an ounce of copper evenly over a square foot, resulting in a value of 1.37 milliseconds (1.37 milliinths).

Normally PCBS are made from an ounce of copper. In addition, when the designer does not give a specific measurement, it is the thickness assumed by the manufacturer.

However, if the current to pass through the PCB will require more than an ounce of copper, the manufacturer can increase the weight or width of the copper trace. However, prices are rising not only because of higher copper prices, but also because processing thicker copper is more challenging and takes more time.

1.3 PCB trace thickness

Printed circuit board (PCB) trace thickness is one of the essential parameters in PCB design. It is specified in the designer garber file to prevent overheating or damage to the PCB. As the current flows or increases, the copper wire begins to heat and eventually the temperature of the PCB increases. When the temperature exceeds the limit of the PCB, it begins to break down. Therefore, the track should be thick enough to allow a higher current to flow through without affecting the average temperature of the PCB.

How is PCB track thickness determined? The current flow through the PCB is compared with the temperature rise. The width from which the processing temperature can rise from the average operating temperature to the maximum operating temperature is the thickness of the trajectory.

The task of calculating the path width will be tedious. Therefore, the designer USES the PCB width calculator to provide the appropriate width for the current to pass through without causing any damage to the PCB. Since the outer layer transfers heat to the inner layer by convection and thus stores more heat, the resulting thickness has a wider inner layer.


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