High Performance Aluminum Core PCB with 2W/MK Thermal Conductivity
1.Introduction
What is an Aluminum Core PCB?
An aluminum core PCB is a type of metal core printed circuit board composed of a copper foil layer, an insulating dielectric layer (prepreg), and a metal aluminum base layer (typically an aluminum plate), bonded together through a hot pressing process. Its defining feature is the replacement of the traditional FR-4 substrate with a metal aluminum core, significantly enhancing the overall structure's thermal conductivity and heat dissipation capability.
Why Use an Aluminum Core PCB?
Due to their excellent thermal conductivity, mechanical strength, and dimensional stability, aluminum core PCBs are widely used in high-power, high-heat electronic devices. Compared to traditional PCBs, aluminum core boards can more efficiently transfer heat from heat-generating components (such as LEDs and power devices) to the metal base layer, which then dissipates into the environment through thermal management structures (like heat sinks or enclosures). This effectively reduces component operating temperatures, improving system reliability and lifespan.
Key Thermal Technology in Aluminum Core PCBs: Prepreg
Prepreg (pre-impregnated insulating layer) is the core dielectric material connecting the copper layer to the aluminum base in an aluminum core PCB. Its performance directly determines the board's insulation strength and thermal efficiency. The prepreg used in this product has a thermal conductivity of 2W/MK and features the following characteristics:
1.High Thermal Conductivity: The 2W/MK rating ensures efficient heat transfer from the copper layer to the aluminum base.
2.Excellent Insulation: With a thickness of 120μm, it provides reliable electrical isolation, preventing short circuits.
3.Thermal Stability: Maintains performance stability in high-temperature environments, suitable for continuous high-power operation.
4.Strong Adhesion: Ensures a tight bond between the copper layer, prepreg, and aluminum base during hot pressing, preventing delamination.
2.PCB Details
| Item | Specification |
|---|---|
| Product Type | Double-layer Copper, Aluminum Core PCB |
| Finished Dimensions | 100mm × 59mm (1 piece) |
| Thermal Conductivity | 2W/MK |
| Aluminum Type | AL 5052 (Supplier: Mingtai) |
| Dielectric Thickness | 120μm (Prepreg) |
| Finished PCB Thickness | 3.15–3.25mm |
| Plated Hole Wall Thickness | 20.5–24μm |
| Outer Copper Thickness | 73μm (~2oz) |
| Solder Mask | Lanbang W-8, White, Hardness 5H, Thickness 16–18μm (Top side only) |
| Silkscreen | Lanbang Thermasetting-08, Black (Top side only) |
| Surface Finish | Lead-Free HASL |
3.PCB Stackup (2-Layer Rigid Structure)
| Layer Sequence | Material | Thickness (mm) |
|---|---|---|
| L1 (Top Layer) | Copper Foil | 0.07 |
| Solder Mask + Silkscreen | 0.016–0.018 | |
| Dielectric Layer | 2W/MK Prepreg | 0.12 |
| L2 (Bottom Layer) | Copper Foil | 0.07 |
| Dielectric Layer | 2W/MK Prepreg | 0.12 |
| Core Substrate | Aluminum Base (AL 5052) | 2.8 |
| Total Thickness | Pressing Final Thickness | Approx. 3.18mm |
4.Typical Applications
LED Lighting: High-power LED modules, automotive lights, street lights, backlight modules, etc.
Power Modules: Switching power supplies, inverters, motor drives, EV chargers, etc.
Automotive Electronics: Vehicle control systems, power battery management, sensor modules, etc.
Industrial Control: High-power frequency converters, servo drives, industrial PC motherboards, etc.
Telecommunications Equipment: Base station power amplifiers, RF modules, communication boards with high thermal demands.
5.Quality Assurance
Artwork Format: Gerber RS-274-X
Quality Standard: IPC-Class-2
Availability: Worldwide
6.Conclusion
This aluminum core PCB, with its high 2W/MK thermal conductivity prepreg, stable aluminum base material, precise process control, and comprehensive surface finish, provides a reliable thermal management solution for high-power, high-heat electronic systems. It delivers excellent performance whether in lighting applications with strict energy efficiency requirements or in automotive and industrial scenarios where stability is paramount.
