Metal Core PCB

A Metal Core Circuit Board (MCPCB), also known as a Metal Core Printed Circuit Board (MCPCB), is a type of printed circuit board that uses a metal core instead of the traditional FR4 material as its substrate. The metal core offers higher thermal conductivity and heat dissipation, making MCPCBs suitable for applications where high-power components generate significant heat.

The main difference lies in the substrate. FR-4 uses glass fiber reinforced epoxy resin for insulation. MCPCBs, on the other hand, use a metal substrate (aluminum or copper) and a thin thermally conductive dielectric layer, resulting in significantly faster heat dissipation than FR-4.

Yes, but there are limitations. While standard MCPCBs are single-sided, multilayer versions exist. These multilayer versions typically laminate circuit layers onto one or both sides of the metal core and use special prepregs and thermally conductive media to maintain heat transfer.

Geyuan Electronics offers comprehensive customization services for your Metal Core Printed Circuit Boards. Whether you need non-standard shapes, custom sizes, or specific hole configurations, we can tailor designs to your requirements.

We ensure the thermal efficiency of our MCPCBs through advanced thermal simulation and precise thermal via design. Carefully designed dielectric layers, copper foil weight, and thermal vias enable efficient heat transfer, while our rigorous testing processes ensure that each board performs optimally under high-temperature conditions.

The lead time for Geyuan Electronics' custom metal core PCBs depends on the complexity and quantity of the order. For standard fast-delivery MCPCBs, we can typically complete the order within 3-5 business days. More complex or high-volume orders may take longer, but we work closely with our customers to ensure on-time delivery.

Typically, the aluminum layer thickness in metal core PCBs ranges from 1.0 mm to 3.2 mm. Heat sinks with metal bases are used for heat dissipation and component protection. The thickness of the aluminum layer depends on the application type of the circuit board and the metal core PCB. The dielectric layer thickness is typically 0.075 mm to 0.2 mm (0.003 inches to 0.008 inches). The dielectric layer thickness depends on the current and voltage.

The manufacturing process for metal core PCBs is as follows: ① Grinding the board (500# brush) → ② Cleaning → ③ Passivation → ④ Cleaning × 3 → ⑤ Drying → ⑥ Drying. Grinding the board: Only the metal surface is ground, according to FR4 parameters.

Due to the presence of the metal layer, metal core PCBs must follow specific process flows. If the circuit board is a single-layer board without interlayer transition to the metal board, standard FR4 dielectric material can be used to press and bond the dielectric layer to the metal board.

For multilayer dielectric stack-up structures, holes must first be drilled in the metal core layer to achieve interlayer transition without causing short circuits. First, slightly larger holes are drilled in the metal layer and filled with insulating gel. After the gel has cured and hardened, copper plating can be performed like a standard via. Then, the remaining parts of the stack-up structure are pressed together and bonded to the metal layers. Finally, through-holes are drilled through the stack, plated, and cleaned.

The first circuit board must be inspected to ensure it is free of scratches, black tin surfaces, other defects, and uniform wear marks.

Yes. MCPCBs are designed for high-power environments. The metal core has high thermal conductivity, preventing components from overheating and stabilizing the performance of high-current circuits such as motor drivers and power converters.

No. The metal core is separated from the circuit by a dielectric insulating layer. In fact, grounding the metal core can act as electromagnetic interference shielding and provide additional planar capacitance, thereby improving signal integrity and reducing noise in high-speed designs.

Yes, plated vias (PTH) can be used on metal core PCBs, but only in specific structures, such as double-sided or multi-layer MCPCBs. In these designs, the metal core is typically positioned between two dielectric layers, allowing vias to pass through without contacting the conductive core.

When a via intersects the metal substrate, insulation must be applied before copper plating, such as by coating a dielectric sleeve, filling with resin, or applying a via isolation layer. This prevents short circuits between the plated via and the metal core. Via diameters typically start from 0.2 mm, with positional tolerances of approximately ±0.05 mm. Maintaining a proper gap (typically ≥0.3 mm) between the via and the metal core is crucial for maintaining electrical isolation and structural integrity.