Aluminium PCB are metal-based, copper-clad laminates with a good heat dissipation function. Usually, Aluminium PCB is refer to LED PCB board, which is the most important part of LED display and lighting products, etc.
Hitech Circuits Co., Limited is a professional aluminum pcb board, LED PCB manufacturer in China. Through 10 years of aluminum pcb board designing and manufacturing experience, Hitech are able to provide high quality and cost effective single layer, double layer and multi layer aluminum pcb boards to global customers. For any of your requirements regarding aluminum pcb board, please don’t hesitate to contact [email protected] .
The heat generated by the LED is conducted to the metal substrate through the insulating layer and then transmitted to the heat sink through the thermal interface material so that most of the heat generated by the LED is diffused into the surrounding air by convection. Generally, the thermal conductive paste will be applied to come into contact the thermal conductive part. Very few applications are multi-layer aluminium PCB boards. The printed circuit board is both the power supply carrier for the LED and the heat dissipation carrier for the LED, so the heat dissipation design of the heat sink and the printed circuit board is very important.
What is aluminium PCB board ?
Aluminium PCB board, also named Aluminium based PCB, metal clad (MCPCB) PCB, insulated metal substrate(IMS or IMPCB) PCB, thermally conductive PCBs, etc. Aluminum printed circuit board ( PCB ) is a unique metal-based copper clad laminate with good thermal conductivity, electrical insulation performance and mechanical processing performance. It is composed of copper foil, thermally conductive insulating layer and metal substrate. It is generally including single layer, double layer and multi layer aluminum pcb board.
The structure of aluminum printed circuit boards
Generally speaking, the PCB aluminum substrate is composed of a circuit layer, a thermally conductive insulating layer and a metal base layer; it can be divided into three layers:
Circuit layer: equivalent to the copper clad laminate of an ordinary PCB, the thickness of the circuit copper foil is 1 to 10 oz. The circuit layer (that is, copper foil) is usually etched to form a printed circuit to connect the various components of the assembly. Generally, the circuit layer requires a large current-carrying capacity, so thicker copper foil should be used, with a thickness of 35μm~ 280μm;
Insulation layer: The insulation layer is a layer of low thermal resistance thermally conductive insulating material. The thickness is 0.003 to 0.006 inches. It is generally composed of a special polymer filled with special ceramics. It has low thermal resistance, excellent viscoelasticity, thermal aging resistance, and can withstand mechanical and thermal stress. It is the core technology of aluminum-based copper clad laminates. Our aluminum printed circuit boards have obtained UL certification.
Metal base layer: The metal base layer is the support member of the aluminium pcb, which requires high thermal conductivity, generally aluminum plate will be used, copper plate can also be used (copper plate can provide better thermal conductivity), suitable for conventional machinery such as drilling, punching and cutting processing.
Main usages and applications of aluminium PCB board:
- Audio devices: input, output amplifiers, balanced amplifiers, audio amplifier, preamplifier, power amplifier etc.
- Power Supply: switching regulator, DC / AC converter, SW regulator .
- Telecommunications electronic equipment: high-frequency electric amplifiers, filtering appliance, transmitter circuit etc .
- Office automation equipment: electric motor, drivers etc .
- Automotive: electronic regulator, ignition, power controllers etc .
- Computer: CPU board, floppy drive, power device etc .
- Power Modules: converter, solid-state relay, power rectifier bridges etc .
- Lamps Lighting: with the promotion of energy-saving lamps, Aluminum base PCB , are widely used on LED lights.
Aluminum pcb vs fr4 pcb board
FR4 board is a code name for the grade of flame-retardant material. It represents a material specification that the resin material must be able to extinguish by itself after burning. It is not a material name, but a material grade. Therefore, there are many types of FR-4 grade materials used for pcb, but most of them are composite materials made of so-called Tera-Function epoxy resin, Filler and glass fiber.
FR-4 PCB board, according to different uses, industry insider generally call them: FR-4 Epoxy Glass Cloth, insulating board, epoxy board, epoxy resin board, brominated epoxy resin board, FR-4 , Fiberglass board, fiberglass board, FR-4 reinforcement board, FPC reinforcement board, flexible circuit board reinforcement board, FR-4 epoxy resin board, flame-retardant insulation board, FR-4 laminated board, epoxy board , FR-4 light board, FR-4 fiberglass board, epoxy glass cloth board, epoxy glass cloth laminate, circuit board drilling pad etc.
Main technical features and applications of FR-4 board: stable electrical insulation performance, good flatness, smooth surface, no pits, thickness tolerance standards, suitable for high-performance electronic insulation requirements products, such as FPC reinforcement board, PCB drilling pad, glass fiber meson, potentiometer carbon film printed glass fiber board, precision star gear (wafer grinding), precision test plate, electrical (electrical) equipment insulation support spacer, insulation backing plate, transformer insulation plate, motor insulation, grinding gear, electronic switch insulation board, etc.
The aluminum pcb board is a metal-based copper-clad laminate with good heat dissipation function. Generally, a single-sided aluminum PCB is composed of a three-layer structure, which is a circuit layer (copper foil), an insulating layer and a metal base layer. For high-end use, it is also designed as a double-sided board, and the structure is circuit layer, insulating layer, aluminum base, insulating layer, and circuit layer. Very few applications are multi-layer boards, which can be formed by bonding ordinary multi-layer boards with insulating layers and aluminum bases.
Compared with traditional FR-4 PCB, aluminum pcb circuit boards have the following advantages:
- Good thermal conductivity. The metal layer of the aluminum pcb board can quickly dissipate heat, transfer the heat of the device, minimize the thermal resistance, and have good thermal conductivity.
- More environmentally friendly. Aluminum-based pcb boards do not contain substances harmful to human health and the environment, and are more environmentally friendly than FR-4 circuit boards.
- High durability. FR-4 pcb may be warped, bent, cracked etc during production and transportation; ceramic substrates are also more fragile. Aluminum pcb circuit boards make up for the shortcomings of FR-4 boards and ceramic substrates, have longer durability, and avoid board cracks caused by production and transportation.
- Higher performance. The circuit layer of the aluminum-based PCB board is etched to form the circuit. Compared with the traditional FR-4 pcb board, under the same line width, thickness, etc., the current carried by the aluminum pcb is higher than that of the FR-4 pcb board.
Advantages of aluminum PCB printed circuit boards
- It is more suitable for SMT process;
- Meet the requirements of RoHs;
- The heat dissipation has been effectively treated, thereby reducing the operating temperature of the module, prolonging the service life and improving the reliability;
- The volume is decreasing, reducing the assembly area of radiators and other hardware, reducing product volume, and reducing hardware and assembly costs;
- Good mechanical durability, better than ceramic circuit boards made by some simple processes.
Disadvantages of aluminum pcb printed circuit boards
- Higher cost: Compared with other cheap PCB products, the price of aluminum-based PCB boards accounts for 30% of the total product price.
- At present, the mainstream manufacturer can only make single-sided PCB boards, and it is difficult to make double-sided aluminum PCB boards. At present, single-sided aluminum PCB boards are relatively skilled in China, and the process and technology of multi-layer aluminum PCB boards are relatively mature in foreign countries. Good news is, through years of aluminum pcb board designing and manufacturing, Hitech are able to provide high quality and cost effective single layer, double layer and multi layer aluminum pcb boards.
- The thermal conductivity test method and the test result do not match, the thermal conductivity of the dielectric layer and the thermal conductivity of the aluminum-based PCB board are different to a certain extent.
- The material standards for aluminum-based copper-clad PCB boards are not unified. There are CPCA industry standards, national standards, international standards, etc.
- If the thickness of the copper foil does not meet the standard, it will cause some phenomena such as burning the circuit and exploding the power supply. However, we never occur such problems.