Lower Price Copper Based PCB with Excellent Quality in China
What is Copper Based PCB?
Heavy copper PCB boards (also being called thick copper board, power board etc) are usually bonded with a layer of copper foil on a glass epoxy substrate. The thickness of copper foil is usually 18μm, 35μm, 55μm and 70μm. The most commonly used copper foil thickness is 35μm. The thickness of copper foil used in China is generally 35-50μm, and there are also thinner ones such as 10μm and 18μm; and thicker ones such as 70μm. The thickness of the composite copper foil on a substrate with a thickness of 1-3mm is about 35μm; the thickness of the composite copper foil on a substrate with a thickness of less than 1mm is about 18μm, and the thickness of a composite copper foil on a substrate with a thickness of more than 5mm is about 55μm. If the thickness of the copper foil on the PCB is 35μm and the printed line width is 1mm, then for every 10mm length, its resistance value is about 5mΩ, and its inductance is about 4nH. When the di/dt of the digital integrated circuit chip on the PCB is 6mA/ns and the working current is 30mA, the resistance and inductance contained in each 10mm printed line are used to estimate the noise voltage generated by each part of the circuit to be 0.15. mV and 24mV.
Copper-based PCB or copper core PCB is a metal core PCB that uses copper as the base material in place of commonly used FR4. Like all metal core PCBs, it also has three main layers. The top layer is made of copper, which is responsible for the electrical connection between the components. This layer is standard in all types of PCBs. The second layer is the dielectric layer that prevents current from the top layer to the base layer. Although this layer is electrically an insulator, it is a good conductor of heat. It transfers the heat produced by the components and helps in heat dissipation. The bottom layer of the PCB is copper, which is why it is a copper core PCB.
Advantages of heavy copper PCB board
Heavy copper plate has the characteristics of carrying large current, reducing thermal strain, and good heat dissipation.
1. The heavy copper circuit board can carry large current
In the case of a certain line width, increasing the copper thickness is equivalent to increasing the cross-sectional area of the circuit, which can carry a larger current, so it has the characteristic of carrying a large current.
2. Heavy copper circuit boards reduce thermal strain
Copper foil has a small electrical conductivity (also called electrical resistivity ), the temperature rise is small when a large current is passed, so it can reduce the amount of heat and thereby reduce the thermal strain.
Metal “conductors” are divided into: ” silver→copper→gold→aluminum→tungsten→nickel→iron ” according to conductivity.
3. The heavy copper circuit board has good heat dissipation
Copper foil has high thermal conductivity (thermal conductivity 401W/mK), which can play an important role in improving heat dissipation performance, so it has good heat dissipation;
Thermal conductivity refers to the heat transfer through an area of 1 square meter within 1H for a 1 meter thick material with a temperature difference of 1°C on both sides under stable heat transfer conditions, measured by W/m·K.
As the more active star products in the metal substrate, copper base PCBs and aluminium substrate PCBs have their advantages and are widely used, which are common in cars, stage lights, control panels, photographic lights, projection lights, Stage laser lamps and other products are excellent high-power accessories.
Copper Base PCBs are an essential part of high-performance electronics. It is characterized by a copper substrate that can enhance thermal conductivity and heat dissipation. Copper base PCBs are critical for applications that require efficient thermal management, such as LED lighting, power electronics, and high-frequency circuits, ensuring their reliability and longevity under demanding conditions.
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