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ODM High Thermal Conductivity Aluminum PCBs from China Suppliers - Reliable Factory Solutions Manufacturers, Manufacturer
Product Description
What is Aluminum PCB?
| Structural Layer | Common Materials | Core Function |
|---|---|---|
| Circuit layer | Electrolytic copper foil ranging from 18 to 140μm | Make circuits and carry the welding of components |
| Insulating layer | Thermal conductive epoxy resin / ceramic filling adhesive | Insulation isolation + heat conduction (thermal conductivity 0.8–8W/m·K) |
| Metal base layer | Aluminum alloy (mainly 6061/5052) | The heat dissipation base quickly disperses the heat conducted by the insulation layer |
Main Application Scenarios
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💡LED Lighting LED beads (especially high-power LEDs) generate concentrated heat. Aluminum substrates are the core substrates for street lamps, spotlights, and panel lights, which can keep the temperature rise of the beads within a safe range.
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⚡Power Electronics Power modules (MOSFETs, IGBTs) of power adapters, frequency converters, and inverters need to dissipate heat quickly to prevent component burnout.
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🚗Automotive Electronics On-board LED headlights, power controllers in the engine compartment, motor driver boards for new energy vehicles.
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🔊Audio Equipment Power amplifier boards, audio power modules — reducing sound quality distortion caused by heat generation.
Core Features
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🌡️Ultra-High Heat Dissipation The metallic thermal conductivity of aluminum plates can quickly transfer the heat generated by components (such as LEDs, power transistors) to the external heat dissipation structure, significantly reducing the temperature rise of the components and extending their service life.
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⚖️Lightweight + High Mechanical Strength The density of aluminum alloy is much lower than that of copper and steel, and its bending resistance and impact resistance are superior to those of ordinary PCBs, making it suitable for portable and vehicle-mounted devices.
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📐Good Dimensional Stability The coefficient of thermal expansion (CTE) of aluminum alloy can be matched with components, reducing warping and solder joint cracking caused by temperature changes.
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🛡️Insulation Safety The insulation layer can withstand high voltage (common withstand voltage ≥3000V AC), preventing short circuits between the circuit and the aluminum plate.
Key Design and Manufacturing Points
Design Considerations
The heat dissipation pads need to be fully in contact with the aluminum plate: under the pads of high-power devices, "heat-conducting pads" should be designed and connected to the side of the aluminum plate through metallized vias (≥0.3mm) to enhance heat dissipation.
Line width adaptation current: Aluminum substrates are mostly used in high-current scenarios. The line width should be designed according to "1A current corresponding to 0.3mm line width (copper thickness 35μm)" to avoid heat generation.
Avoid burrs during aluminum plate cutting: Burrs on the edges of aluminum plates can easily puncture the insulation layer, so chamfering (≥0.5mm) treatment is required.
Line width adaptation current: Aluminum substrates are mostly used in high-current scenarios. The line width should be designed according to "1A current corresponding to 0.3mm line width (copper thickness 35μm)" to avoid heat generation.
Avoid burrs during aluminum plate cutting: Burrs on the edges of aluminum plates can easily puncture the insulation layer, so chamfering (≥0.5mm) treatment is required.
Manufacturing Process
Insulation layer bonding: High-temperature and high-pressure (180℃/3MPa) bonding is required to ensure that the insulation layer is free of bubbles and the peel strength is ≥1.0N/mm.
Surface treatment: Tin plating / nickel-gold plating is preferred, and OSP (organic film has poor heat resistance) should be avoided.
Forming method: CNC milling is adopted (instead of die-cutting for ordinary PCBs) to ensure the flatness of the aluminum plate edges.
Surface treatment: Tin plating / nickel-gold plating is preferred, and OSP (organic film has poor heat resistance) should be avoided.
Forming method: CNC milling is adopted (instead of die-cutting for ordinary PCBs) to ensure the flatness of the aluminum plate edges.
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Frequently Asked Questions (FAQ)
Q
What is an aluminum PCB and how does it differ from a standard PCB?
An aluminum PCB (also called aluminum substrate or metal core PCB) uses an aluminum alloy base instead of the traditional FR4 fiberglass. It consists of three layers: a circuit layer (copper foil), an insulating thermal layer, and a metal base. Unlike standard PCBs, aluminum PCBs offer significantly superior heat dissipation, making them ideal for high-power applications such as LED lighting and power electronics.
Q
What is the thermal conductivity range of aluminum PCBs?
The insulating layer of aluminum PCBs typically offers a thermal conductivity ranging from 0.8 to 8 W/m·K, depending on the specific material used (such as thermal conductive epoxy resin or ceramic filling adhesive). Higher thermal conductivity values are preferred for high-power applications where efficient heat transfer is critical.
Q
Which aluminum alloys are commonly used in aluminum PCB manufacturing?
The most commonly used aluminum alloys for PCB manufacturing are 6061 and 5052. These alloys are selected for their excellent combination of thermal conductivity, mechanical strength, lightweight properties, and dimensional stability, making them well-suited for demanding electronic applications.
Q
What surface treatment options are available for aluminum PCBs?
Tin plating and nickel-gold plating (ENIG) are the recommended surface treatments for aluminum PCBs due to their superior heat resistance and reliability. OSP (Organic Solderability Preservative) is generally not recommended because its organic film has poor heat resistance, which can negatively affect performance in high-temperature environments.
Q
What voltage can the insulation layer of an aluminum PCB withstand?
The insulation layer of a standard aluminum PCB can typically withstand voltages of ≥3000V AC. This high dielectric strength effectively prevents short circuits between the copper circuit layer and the aluminum base, ensuring reliable and safe operation in high-voltage applications.
Q
Why is CNC milling preferred over die-cutting for aluminum PCB forming?
CNC milling is preferred for aluminum PCB forming because it ensures precise, clean edges with consistent flatness. Die-cutting, which is commonly used for standard PCBs, can create burrs on the aluminum edges. These burrs are dangerous because they can puncture the insulation layer, leading to short circuits or insulation failure. CNC milling also allows for chamfering (≥0.5mm) to further prevent edge-related damage.
