Aluminum PCB

Aluminum PCBs — also known as Metal Core PCBs (MCPCB) or Insulated Metal Substrate (IMS) boards — replace the standard FR4 fiberglass substrate with an aluminum base layer. This fundamental change in construction gives aluminum PCBs their defining characteristic: dramatically superior thermal conductivity compared to conventional FR4 boards.

While FR4 has a thermal conductivity of approximately 0.3 W/m·K, aluminum PCBs achieve 1.0 to 3.0 W/m·K depending on the dielectric layer specification — up to ten times better heat dissipation. Heat generated by power components is conducted rapidly through the dielectric layer into the aluminum base, where it spreads across the board and dissipates into the surrounding environment or heatsink.

The construction of an aluminum PCB consists of three layers: a copper circuit layer on top, a thermally conductive dielectric (insulating) layer in the middle, and the aluminum base at the bottom. The dielectric layer is the key component — it must provide electrical isolation between the circuit and the aluminum base while minimising thermal resistance to allow maximum heat transfer.

Aluminum PCBs are the preferred solution for high-power LED applications, where the junction temperature of LED chips must be tightly controlled to maintain light output, color consistency, and long operating life. They are equally valuable in power electronics, automotive lighting, and any application where concentrated heat from power components must be managed efficiently without bulky external heatsinks.