ODM Aluminum PCB Suppliers, Quotes
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
LED lighting
LED beads (especially high-power LEDs) generate concentrated heat. Aluminum substrates are the core substrates for street lamps, spotlights, and panel lights, keeping bead temperature rise within a safe range.
Power electronics
Power modules (MOSFETs, IGBTs) in power adapters, frequency converters, and inverters require rapid heat dissipation to prevent critical component burnout and ensure circuit longevity.
Automotive electronics
Widely integrated into on-board LED headlights, engine compartment power controllers, and motor driver boards engineered for new energy vehicles requiring rugged thermal resilience.
Audio equipment
Applied in power amplifier boards and audio power modules, mitigating sound distortion caused by localized overheating while maintaining clean audio output signals.
Core features
Ultra-high heat dissipation
The metallic thermal conductivity of aluminum plates quickly transfers heat generated by components (such as LEDs and power transistors) directly to the external heat sink structure, significantly lowering operating temperatures and extending service life.
Lightweight + high mechanical strength
The density of aluminum alloy is significantly lower than copper and steel. Its superior bending and impact resistance outperform conventional PCBs, making it ideal for portable devices and vehicle installations.
Good dimensional stability
The coefficient of thermal expansion (CTE) matches surface-mounted components effectively, significantly reducing structural warping, mechanical stress, and solder joint cracking during sudden temperature shifts.
Insulation safety
Engineered with specialized dielectric layers capable of withstanding high electrical breakdown voltages (common withstand voltage ≥3000V AC), effectively preventing short circuits between circuits and the aluminum plate.
Key design and manufacturing points
Design considerations
Heat dissipation pads full contact: High-power device pads require dedicated thermal conductive designs connected to the aluminum base via metallized vias (≥0.3mm) for accelerated thermal conduction.
Line width adaptation: Given high-current operations, trace layouts follow the rule of "1A current per 0.3mm trace width (35μm copper thickness)" to mitigate trace heating.
Burr prevention: Sharp edges from aluminum plate cutting can puncture the insulation layer; a chamfering process (≥0.5mm) is strictly required.
Manufacturing process
Insulation layer bonding: Processed under high temperature and pressure (180℃ / 3MPa) to eliminate air voids and ensure a peel strength of ≥1.0N/mm.
Surface treatment: Tin plating or Immersion Gold/Nickel is strongly preferred; OSP is avoided due to organic film degradation under sustained high thermal loads.
Precision forming: High-accuracy CNC milling replaces mechanical die-cutting used on standard FR4 to ensure smooth, burr-free aluminum edge perimeters.
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Frequently Asked Questions (FAQ)
Q What is the thermal conductivity difference between FR4 and Aluminum PCB?
Standard FR4 PCB has very poor thermal conductivity, typically around 0.2 to 0.3 W/m·K. In contrast, Aluminum PCBs offer thermal conductivity values between 1.0 and 8.0 W/m·K, which is 5 to 40 times higher, allowing rapid dissipation of heat from active components.
Q Can an Aluminum PCB have multiple copper circuit layers?
Yes. While single-sided Aluminum PCBs are the most common, multi-layer aluminum-backed PCBs can be manufactured by laminating multi-layer FR4 structures onto an aluminum base with a dedicated thermally conductive prepreg/dielectric.
Q Why are 6061 and 5052 aluminum alloys commonly selected?
Aluminum 5052 provides superior formability, high fatigue strength, and high corrosion resistance. Aluminum 6061 offers higher mechanical strength, excellent machinability, and superior hardness, ensuring minimal bending under high mechanical load.
Q What is the role of the dielectric insulating layer?
The dielectric layer is the critical core of an insulated metal substrate (IMS). It provides both high electrical insulation (voltage breakdown rating up to 3000V AC or higher) and high thermal path efficiency, bonding the copper layer firmly to the aluminum plate.
Q Which surface finish is recommended for high-power Aluminum PCBs?
Electroless Nickel Immersion Gold (ENIG) and Lead-Free HASL are strongly recommended. Organic Solderability Preservatives (OSP) are generally avoided because organic coatings degrade rapidly under the continuous high-temperature cycles typical of power electronics.
Q How does an Aluminum PCB prevent thermal mismatch cracking?
Aluminum substrates disperse concentrated heat across the entire metal surface, preventing localized thermal stress concentrations that cause board warping and solder fatigue failure under continuous operating conditions.
