PCB Capabilities
Metal Core PCB (MCPCB)
Aluminum and copper core boards for superior thermal performance.
A metal core PCB — commonly abbreviated MCPCB — uses a metal base layer (typically aluminum or copper) as the structural and thermal foundation of the circuit board. A thin dielectric layer separates the metal core from the copper circuit layer, providing electrical isolation while conducting heat from the components through the metal base to an external heatsink or enclosure. AstroPCB manufactures metal core PCBs for LED lighting, power supplies, motor drivers, automotive electronics and any application where thermal management through the substrate is a primary design requirement.
How an MCPCB works
The construction of a metal core PCB is straightforward compared to multilayer organic boards. A single-layer MCPCB consists of three elements: a copper circuit layer (typically 1-4 oz), a thermally conductive dielectric layer (0.075 mm to 0.20 mm), and an aluminum or copper base plate (typically 0.8 mm to 3.0 mm). Heat generated by components on the circuit layer conducts through the thin dielectric into the metal base, which spreads the heat laterally and transfers it to the mounting surface.
The dielectric layer is the critical performance element. Its thermal conductivity — typically 1 to 3 W/mK for standard grades and up to 8 W/mK for premium grades — determines how effectively heat moves from the circuit layer to the metal core. Lower thermal resistance means lower junction temperatures, longer component life and higher power density.
Aluminum core vs copper core
Aluminum-core MCPCBs account for the majority of metal core PCB production. Aluminum is lightweight, inexpensive and easy to machine. Its thermal conductivity (approximately 200 W/mK) is more than sufficient for most LED and mid-power applications. Aluminum MCPCBs are the standard choice for LED street lights, automotive LED headlamps, commercial LED panels and general-purpose power conversion circuits.
Copper-core MCPCBs provide roughly twice the thermal conductivity of aluminum (approximately 400 W/mK). Copper cores are specified when the application generates more heat per unit area than aluminum can manage — for example, high-power laser diode drivers, concentrated solar cell receivers, and GaN power amplifier pallets. The trade-off is higher material cost and greater weight.
Applications
LED lighting is the largest application for MCPCBs. LED efficacy and color stability depend directly on junction temperature — every degree of temperature reduction extends LED life and maintains lumen output. An aluminum MCPCB with a 1.5 W/mK dielectric provides significantly better thermal performance than a standard FR-4 board with thermal vias, and at lower cost for single-layer LED circuits.
Power electronics use MCPCBs for DC-DC converters, motor drivers, battery chargers, inverters and power factor correction stages. The metal base provides both thermal management and mechanical stiffness, reducing the need for external heatsink brackets. In automotive applications, MCPCBs are specified for LED headlamp drivers, body control modules with integrated power stages, and starter-generator controllers.
Manufacturing capabilities
AstroPCB manufactures single-layer, double-layer and multilayer MCPCBs. Single-layer is the most common configuration for LED and simple power circuits. Double-layer MCPCBs use plated through-holes to connect circuit layers on both sides of the dielectric, with the metal core providing thermal grounding. Multilayer MCPCBs combine organic prepreg layers above the metal core to provide additional routing layers — useful when the circuit requires both thermal management and routing density.
Standard aluminum base thicknesses range from 0.8 mm to 3.0 mm. Copper weights from 1 oz to 4 oz are supported on the circuit layer. Board dimensions up to 500 mm x 600 mm are available. Countersink holes, slots and custom board outlines are machined using CNC routing.
Request an MCPCB quote
Provide your Gerber files, base material preference (aluminum or copper), dielectric thermal conductivity target, and quantity. The engineering team will confirm the dielectric grade, base thickness and manufacturing approach, then return a quotation with pricing and lead time.