The influence of copper thickness on printed circuit boards

The pcb is one of the indispensable components in electronic engineering. It is usually a thin plate, whose surface is covered with many fine lines and wires to transmit current and signals. The copper thickness of printed circuit boards is one of the important factors affecting their performance.

The selection of copper thickness for printed circuit boards will affect their performance, including resistance, current transmission capacity, and signal transmission capacity.

Firstly, the thickness of copper determines the resistance of the printed circuit board. The larger the thickness of copper, the lower the resistance of the printed circuit board. Contemporary circuit boards require very high manufacturing accuracy, and the accuracy of electronic components is also increasing. Therefore, it is necessary to ensure that the resistance of the printed circuit board is as small as possible. Choosing an appropriate copper thickness can enhance the anti noise interference ability of the printed circuit board to a certain extent, and improve the stability and reliability of the signal.

Secondly, the ability of printed circuit boards to transmit current is also related to the thickness of copper. Copper is equivalent to the conductor of a printed circuit board, so the thicker the copper, the stronger its conductivity and can withstand larger current loads. For example, in high-end electronic devices, the current load borne by printed circuit boards is often very large, and it is necessary to choose copper materials with moderate thickness to achieve the goal of accommodating efficient current transmission.

The signal transmission capability of printed circuit boards is also closely related to the thickness of copper. Due to the fact that signals are transmitted through wires on the printed circuit board, the transmission capacity of signal strength and quality depends on the thickness of copper. If the thickness of copper is too small, it will cause signal transmission loss, which will affect the efficiency and accuracy of the entire electronic system.

The commonly used thicknesses of international PCB copper foil are 17.5um, 35um, 50um, and 70um. If the customer does not specify, single and double sided copper thickness is generally 35um, that is, 1 amp copper. Of course, some special circuit boards will use 3OZ, 4OZ, 5OZ, 8OZ, etc., according to the product needs to choose the appropriate copper thickness.

Due to different uses, the thickness of the copper sheet also varies. Ordinary 0.5oz, 1oz, and 2oz are commonly used in consumer and communication products. Above 3oz belongs to thick copper products, mostly used for high current, such as high-voltage products and power boards!

The influence of copper thickness on printed circuit boards cannot be ignored. Choosing an appropriate copper thickness can achieve good circuit operation performance, while ensuring the reliability and stability of the circuit. Therefore, when selecting the material of a printed circuit board, different thicknesses of copper should be selected based on the specific application situation to fully utilize the performance of the board.