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20 mil RO4003C PCB
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Aluminum Base Circuit Board PCB for LED

  • July 21. 2022
Aluminum Base Circuit Board PCB for LED 

While many conventional PCBs provide excellent functionality, not all PCBs are suitable for LED applications. For optimum performance in lighting applications, PCBs for LEDs must be designed to maximize heat transfer capabilities. Aluminum-based circuit boards provide a versatile foundation for a variety of high-output LED applications, and LED lighting solutions are rapidly gaining traction in a variety of industries, valued for their low power consumption, high efficiency, and impressive light output. Most high light output LED applications use aluminum-based circuit boards, mainly because aluminum-based circuit boards can achieve higher levels of heat transfer. Bicheng is a professional R&D and manufacturer of high-precision PCB circuit boards, which can mass produce 4-46-layer pcb boards, circuit boards, high-frequency boards, high-speed boards, HDI boards,  high-frequency high-speed boards, double-sided, Multilayer circuit boards, hdi circuit boards, mixed-voltage circuit boards, high-frequency circuit boards, rigid-flex boards, etc.

The biggest difference between aluminum-based circuit boards and conventional FR4 circuit boards is heat dissipation. Compared with aluminum-based circuit boards with a thickness of 1.6mm, FR4 circuit boards have a thermal resistance of 20 to 22°C for the former, and a much smaller thermal resistance of 1.0 to 2.0°C for the latter. . Aluminum-based circuit board is a metal-based copper clad laminate with good thermal conductivity, which has good thermal conductivity, mechanical processing performance, and gas and electrical insulation properties.


Aluminum PCB


(1) Heat dissipation
At present, many double-sided and multi-layer boards have high density and high power, and it is difficult to dissipate heat. Conventional printed circuit board substrates such as FR4 and CEM3 are poor conductors of heat, with insulation between layers, and heat cannot be dissipated. Local heating of electronic equipment cannot be ruled out, resulting in high temperature failure of electronic components, and aluminum-based circuit boards can solve this heat dissipation problem.

(2) Dimensional stability
Aluminum-based circuit boards are obviously much more stable in size than printed boards with insulating materials. Aluminum-based circuit boards and aluminum sandwich panels are heated from 30 °C to 140~150 °C, and the dimensional change is 2.5~3.0%.

(3) Thermal expansion
Thermal expansion and contraction are the common nature of substances, and the thermal expansion coefficients of different substances are different. The aluminum-based circuit board can effectively solve the problem of heat dissipation, so as to alleviate the problem of thermal expansion and contraction of different materials on the printed circuit board, and improve the durability and reliability of the whole machine and electronic equipment, especially to solve the SMT patch Processing thermal expansion and contraction problems.

(4) Other properties
The aluminum-based circuit board has a shielding effect, replaces the brittle ceramic substrate, and uses surface mounting technology with confidence, reduces the really effective area of the printed circuit board, replaces components such as heat sinks, improves product heat resistance and physical properties, and reduces production costs and labor. .

The advantage of aluminum-based boards is that heat dissipation is significantly better than that of standard FR4 boards, the dielectric used is typically 5 to 10 times the thermal conductivity of conventional epoxy glass, and the heat transfer index is one-tenth the thickness of conventional PCBs. Circuit boards are more efficient. What is the thermal conductivity of aluminum-based circuit boards? The thermal conductivity of the aluminum-based circuit board refers to the heat dissipation performance parameter of the aluminum-based circuit board, which is one of the three major standards to measure the quality of the aluminum-based circuit board. The thermal conductivity of the aluminum-based circuit board can be obtained by testing the data after the sheet is pressed together. The higher the thermal conductivity is, the better the performance of the aluminum-based circuit board.

The thermal conductivity of the aluminum-based circuit board varies from 1.0 to 2.5. The aluminum-based circuit board is a metal-based copper clad laminate with good heat dissipation function. Usually a single panel consists of a three-layer structure, which are the circuit layer (copper foil), Insulating layer and metal base layer. For high-end use, there are also double-sided designs with a structure of circuit layer, insulating layer, aluminum base, insulating layer, and circuit layer. Very few applications are multi-layer boards, which can be made by laminating ordinary multi-layer boards with insulating layers and aluminum bases. The thermal conductivity of the aluminum-based circuit board is determined by the thickness of the copper foil and the insulating layer. The thickness of the copper foil is 25mu, 35mu, and 70mu, respectively. ), ceramic powder (excellent thermal conductivity).

The thermal conductivity of aluminum-based circuit boards is generally fixed and will not change with external factors. The size of the thermal conductivity is mainly determined by the raw materials of aluminum-based circuit boards. If high thermal conductivity materials such as copper and silver are added, the thermal conductivity of aluminum substrate materials will definitely be higher. Thermal conductivity is a basic physical quantity, a fixed component of a material, and its thermal conductivity has nothing to do with thickness or area. Nowadays, the ones with high thermal conductivity are usually ceramics, copper, etc., but because of the question of cost, most of the circuit boards on the market are aluminum-based circuit boards. The thermal conductivity of the corresponding aluminum substrate is a parameter that everyone cares about. The higher the thermal conductivity It is one of the symbols that represents the better the function.

(1) Telecom industry: Telecom equipment usually uses PCB to control its LED indicators and displays. Lightweight and durable PCBs tend to be advantageous in this industry, mainly due to the density of mechanical equipment in the industry. Aluminum-based circuit boards are often found in telecom lighting applications as they tend to have better heat transfer characteristics than FR4 circuit boards.

(2) Automotive industry:  LED aluminum PCB displays are common in the automotive industry, especially in dashboard indicators, headlights, brake lights and advanced panel displays. The industry particularly likes PCB LEDs because of their low manufacturing cost and durability, which increases the value and lifespan of vehicles.

(3) Computer technology industry: PCB-based LEDs are becoming more and more common in the computer technology industry and are commonly found in monitors and indicators for desktop and laptop computers. Due to the heat-sensitive nature of computer technology, aluminum-based circuit boards are particularly suitable for LED lighting applications within computers.

(4) Medical industry: Lighting tools are extremely important in medical applications, especially in surgical and emergency applications, where strong light can help improve the doctor's vision. In these applications, LEDs tend to be the lighting method of choice due to their low power and small size. PCBs are often used as the basis for these applications, especially aluminum-based circuit boards, which have a longer lifespan and better heat transfer capabilities than other types of PCBs. In this way, aluminum-based circuit boards ensure long-lasting medical devices that can be used repeatedly in a variety of medical settings.

(5) Residential and storefront applications: In addition to the uses listed above, PCB LEDs are becoming increasingly popular in homes and businesses in the form of signage and displays. Smart LED lighting is an inexpensive way for homeowners to efficiently light their homes, and customizable LED displays can direct business to storefronts. Bicheng is a professional R&D and manufacturer of high-precision PCB circuit boards, which can mass produce 4-46-layer pcb boards, circuit boards, circuit boards, high-frequency boards, high-speed boards, HDI boards, pcb circuit boards, high-frequency boards High-speed boards, double-sided, multi-layer circuit boards, hdi circuit boards, mixed-voltage circuit boards, high-frequency circuit boards, rigid-flex boards, etc.

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