Definition

Metal-core PCBs (MCPCB) use an aluminum or copper base layer for thermal management. Heat from components conducts through a thin dielectric (0.075-0.2mm) into the metal core, which spreads and dissipates it. Thermal conductivity: aluminum ~1-2 W/mK for the dielectric layer, copper core ~380 W/mK. Used for high-power LEDs, motor drives, and power supplies. Single-sided is most common; double-sided requires insulated vias. Aluminum is standard; copper costs more but conducts better. The dielectric layer is the thermal bottleneck - thinner is better but reduces voltage isolation.