Presumably all engineers and partners know that the commonly used PCB boards are single-sided or double-sided copper cladding on the surface of the insulating sheet. As a specific form of PCB, the aluminum substrate usually adopts single-sided copper cladding, and the insulating layer is made very thin. , and then superimpose an aluminum plate on the side without copper cladding, the so-called aluminum substrate, which is usually used in audio, power supply, communication electronic equipment, automobiles, computers, lamps and lanterns, etc.
So, what's so good about aluminum substrates?
Good heat dissipation performance: The aluminum substrate can minimize thermal resistance, have a smaller thermal resistance, and the thermal expansion coefficient is closer to that of copper foil, which makes the aluminum substrate have excellent thermal conductivity and heat dissipation performance, reduces the operating temperature of the module, and prolongs the service life. .
High current carrying: With the same thickness and the same line width, the aluminum substrate can carry higher current.
Good machinability: can replace ceramic substrate, better mechanical durability. At the same time, high strength and toughness can realize large-area printed board manufacturing and component placement.
Good electromagnetic wave shielding: In order to ensure the performance of electronic circuits, some components in electronic products need to prevent electromagnetic wave radiation and interference. The aluminum substrate can act as a shielding plate to shield electromagnetic waves
Environmental protection: The aluminum used in the raw material is non-toxic and recyclable. Compliant with RoHS requirements.
Lightweight: Aluminium has a surprisingly light weight with excellent strength and elasticity, which is very convenient.
However, from the point of view of process and selectivity, aluminum substrates still have some disadvantages in the existing market, such as:
High cost: Compared with cheap commodities, the price of aluminum substrates accounts for more than 30%.
High process difficulty: At present, it is difficult to make double-sided panels, the process is complicated, and in the manufacturing process, problems are also prone to occur in terms of voltage resistance and electrical strength.
Plates are not uniform: CPCA industry standards, national standards, international standards, etc., and there is no uniform standard for material specifications.
Others, such as aluminum base, will cause substandard impact on the board's withstand voltage index, and the thickness of copper foil will not meet the standard, which will lead to some phenomena such as burning the circuit and frying the power supply. There are also reasons why manufacturers cut corners.
Choose a reliable manufacturer to ensure product quality. Jie is equipped with a special aluminum substrate production line, and has introduced advanced equipment such as AOI optical detector, CNC numerical control machine tool, LDI exposure machine, etc., and also provides substrate thermal conductivity detection and insulation layer detection. Provide customers with high-quality aluminum substrate proofing services.