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Generally, with PCB thickness, the application or usage area determines how thick the board will be. The thickness ranges from 0.008 inches to 0.240 inches, there are thin Layer PCBs, but the standard or industrial standard PCB thickness is 0.063inches (1.57mm). There is the historical explanation for that specific size, in the beginning; with the development of Circuit Boards which were made of Bakelite sheets.

The thickness became an essential part of the circuit board when multiple layer Electronic boards started to emerge. With the multiple layers, the need for a mode of connection between layers was evident, and copper was used for that on the plate edges. The thickness of the connectors between the boards had to match, and that became the standard PCB thickness.

Standard PCB board thickness

The board thickness is always based on both the insulating material and the top layer material; at the beginning of Circuit boards, this would be Bakelite sheet included as the top layer of the plywood at the end the total thickness of the board would lead to 0.065inches.

Standard PCB copper thickness

The Copper thickness plays a vital role on how you select a PCB thickness with the copper thickness measured in ounce per area square foot.

Usually, the Printed Circuit Board is around 1 oz with 1.4 mm to 2.8mm thickness for the internal layer, at the end; the finished weight would be about 2 oz to 3oz which can be adjusted based on your preference.

Standard PCB trace thickness

When you talking about Trace thickness of a PCB board, you are talking about the preferable thickness decided by the designer during the design process, the most used trace thickness ranges from 0.008 inches to 0.240 inches with particular attention paid to 0.2 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.6 mm, 2.0 mm, 2.3 mm.

Standard PCB core thickness

When we are talking about core thickness, we are talking about a layer of FR4 with copper on either side that are manufactured in a core factory. Smooth Copper foils with specific thickness are used to form the layer of FR4.

With Core thickness you have to also look at Pre-preg, this is a fiber weave impregnated with a resin bonding agent made by PCB manufacturers to stick together etched cores. Pre-preg is a thin layer of uncured FR4 that varies with the height of the etched boards either side of it.

The Core is thick fiberglass known for its layer rigidity while the Pre-preg is a thin layer of fiberglass that is used to laminate the core.

When the thickness requirement is not met, the customer may not notice it as long as the PCB board works “fine” as the PCB core materials used may not be critical to performance.

PCBs of now though, have performance has an important factor, and the thickness always needs to be precise for the best possible functionality of the board, so the designer always needs to communicate the precise requirements to the fabricator in proper documentation.

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