The ultimate solution for high-power thermal management, combining superior heat dissipation with mechanical durability.
Aluminum-based PCBs, also known as Metal Core PCBs (MCPCB) or Insulated Metal Substrates (IMS), are engineered for applications where heat is the primary enemy of performance. By replacing traditional fiberglass (FR4) with a thermally conductive metal base, these boards can dissipate heat up to 10 times more efficiently.
The performance of an aluminum PCB depends on the synergy between its three core layers:
1. Circuit Copper Layer
Typically 1oz to 6oz. Thicker copper is used for high-current applications to minimize voltage drops.
2. Dielectric Layer
The "heart" of the board. A ceramic-filled polymer layer with high thermal conductivity ($1.0 - 8.0 W/m \cdot K$).
3. Aluminum Base
Commonly 5052 or 6061 alloys. Provides mechanical support and the final heat dissipation path.
What is Aluminum PCB
Cross-Section View of Aluminum Core PCB with LED
Aluminum PCBs are primarily single-sided, but advanced designs allow for increased complexity:
- Single-Layer: The standard for LED lighting. Single-sided component mounting.
- Two-Layer (Single-Sided Mounting): Internal copper plane for routing, but components remain on one side.
- Double-Sided (PTH): Components on both sides. Requires specialized resin-filled holes to isolate the aluminum core.
- Multi-Layer (HDI): Used in power converters, often incorporating blind/buried vias for high-density routing.
| Base Material | Thermal Conductivity ($W/m \cdot K$) | Mechanical Strength | Cost Profile |
|---|---|---|---|
| Standard FR4 | 0.25 - 0.5 | Moderate | Lowest |
| Aluminum (MCPCB) | 1.0 - 8.0 | High | Moderate |
| Copper Base | 380 - 400 | High | High |
| Stainless Steel | 15 - 20 | Very High | Moderate |
Wherever high-power components generate excessive heat, aluminum PCBs are the preferred choice:
- LED Technology: Street lights, high-bay lighting, and automotive headlights.
- Power Conversion: DC-DC converters, inverters, and power supply modules.
- Automotive: Power steering controllers, ignition systems, and EV battery management.
- Audio: High-power amplifiers where thermal stability is critical for sound quality.
| Parameter | Capability Range |
|---|---|
| Supported Alloys | 5052, 6061, 1060 Aluminum Alloys |
| Thermal Conductivity | Standard: 1.0 - 3.0 $W/m \cdot K$; Premium: up to 8.0 $W/m \cdot K$ |
| Board Thickness | 0.6mm, 1.0mm, 1.6mm, 2.0mm, 3.2mm |
| Solder Mask | Super-White (High Reflectivity >90%), Black, Green |
| Surface Finish | HASL (LF), ENIG, OSP, Immersion Silver |
| Breakdown Voltage | >3000V AC (Ensures electrical safety) |
