PCB News - What is the standard pcb thickness？

What is the standard pcb thickness?As the conductor of PCB board,copper foil is easy to adhere to the insulating layer and form a circuit pattern after corrosion.Today,the editor of PWB factory will introduce some knowledge of PCB copper thickness.

What is the general thickness of PCB copper?

The thickness of the copper foil is expressed in oz (ounces),1oz=1.4mil,and the average thickness of the copper foil is expressed in weight per unit area.The formula is:1oz=28.35g/ FT2 (FT2 is square feet,1 square foot=0.09290304㎡ ).

The common pcb thickness of international circuit board copper foil are: 17.5um,35um,50um,70um.Generally,customers do not have special remarks when making PCB.The copper thickness of single-sided and double-sided is generally 35um,that is,1A copper.Of course,some of the more special circuit boards will use 3OZ,4OZ,5OZ...8OZ,etc,and choose the appropriate copper thickness according to the product requirements.

Generally,the copper thickness of single and double-sided PCB boards is about 35um,and the other copper thickness is 50um and 70um. The copper thickness of the surface layer of the multilayer board is generally 35um,and the copper thickness of the inner layer is 17.5um.The use of PCB copper thickness mainly depends on the use of the PCB and the size of the signal voltage and current 70% of the circuit boards use a copper foil thickness of 3535um.Of course,for circuit boards with excessive current,the copper thickness will also be 70um,105um,140um (rarely),etc.

For different purposes, the thickness of the copper skin is also different, the ordinary 0.5oz,1oz,2oz,mostly used in consumer and communication products.Thick copper products above 3oz are mostly used for high currents,such as high voltage products, and power boards!

PCB boards are used for different purposes,and the copper thickness used is also different.For general consumer and communication products,0.5oz,1oz,and 2oz copper thickness are used; for most high-current products,such as high-voltage products,power boards and other products,thick copper products above 3oz are generally used.

Factors affecting the selection of copper pcb thickness

1.Use of the environment

The thickness of copper plate is closely related to the use of the environment. If used in harsh environments, such as high temperature, high pressure or corrosive occasions, be sure to choose a thicker copper to ensure its stability and durability.

2.Mechanical strength requirements

If the copper plate needs to withstand large mechanical loads,the thickness of the copper plate should be appropriately thickened to avoid deformation or breakage.

3.Economic cost

The greater the thickness of the copper plate,the higher the production cost. Therefore, under the premise of meeting the requirements of use, should be as thin as possible to choose the copper plate.

PCB copper thickness setting rules

Design specification:At the design stage,engineers need to calculate the minimum copper foil area or width according to the current demand of the circuit,and then deduce the required copper foil thickness.For High Density Interconnect (HDI) boards or high frequency circuits,thinner copper foils may be required to minimize parasitic effects.

Manufacturing constraints:The process capability of different PCB manufacturers varies,and some complex multilayer boards or special requirements may be limited by the manufacturer's processing capability in terms of copper foil thickness.The design should be confirmed with the manufacturer in advance.

Environmental factors:For PCBs in extreme operating environments (e.g., high temperature, high humidity, or high vibration environments), copper foil thickness may need to be adjusted to enhance circuit stability and durability.

Circuit board production of open material is mainly considered board thickness and copper thickness,board thickness greater than 0.8 MM board, the standard series: 1.0 1.2 1.6 2.0 3.2 MM, board thickness less than 0.8 MM is not considered a standard series,the thickness can be determined by the need,but the thickness is often used: 0.1 0.15 0.2 0.3 0.4 0.6 MM, this material is mainly used for multilayer boards Inner layer.

Outer PCB design board thickness selection attention,production and processing needs to increase the thickness of copper-plated thickness,solder resistance thickness, surface treatment (tin spray, gold-plated, etc.) thickness and character,carbon oil and other thicknesses,the actual production of the board will be thicker than the gold plate 0.05-0.1MM, tin plate will be thicker than the 0.075-0.15MM.For example,the finished product when the design of the PCB requires a board thickness of 2.0 mm,the normal choice of 2.0mm sheet material openings For example, PCB design requires a finished board thickness of 2.0 mm, the normal choice of 2.0mm sheet material open, taking into account the plate tolerance and processing tolerance, the finished board thickness will reach between 2.1-2.3mm,if the PCB design must be required to finish the board thickness can not be greater than 2.0mm,the plate should be selected for the production of non-conventional 1.9mm sheet material,double-layer PCB circuit board manufacturers need to be ordered from the plate manufacturer temporary,the delivery cycle will become very long.

Inner layer production,you can adjust the thickness of the laminate through the thickness of the semi-cured sheet (PP) and the structure of the configuration,the range of choice of core plate can be flexible, for example,the finished product board thickness requirements of 1.6mm,the choice of the plate (core plate) can be 1.2MM can be 1.0MM,as long as the laminated out of the board thickness control within a certain range, you can meet the finished product board thickness requirements.

Another is the board thickness tolerance,PCB designers in the consideration of product assembly tolerances at the same time to consider the double PCB circuit board processing board thickness tolerance,the impact of the finished product tolerance is mainly three aspects, plate material tolerance,lamination tolerance and outer layer thickening tolerance. Now provides several conventional plate tolerance for reference: (0.8-1.0) ± 0.1 (1.2-1.6) ± 0.13 2.0 ± 0.18 3.0 ± 0.23 Lamination tolerance according to the number of different layers and plate thickness, the tolerance control in the ± (0.05-0.1) MM between. Especially for boards with board edge connectors (e.g. printed plugs), the board thickness and tolerances need to be determined according to the requirements for matching with the connectors.

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The above is the relevant knowledge of standard pcb thickness,I hope it will be helpful to you.