Metal Base PCB

A Metal PCB (Metal Core Printed Circuit Board) is a type of printed circuit board that uses a metal core as the substrate material instead of regular materials like FR4 The metal core provides several advantages, making metal PCBs suitable for specific applications, particularly those requiring efficient heat dissipation. In YaHengCircuit, we are able to manufacture metal PCBs like Aluminium, Copper, and Ceramic PCBs.

The Base Materials for Metal PCBS

  • Aluminum Base

    The most commonly used aluminum-based substrates for manufacturing metal-core printed circuit boards (MCPCBs) are LF, L4M, and LY12. These substrates are required to have a tensile strength of 294 N/mm² and an elongation of 5%. The commonly used thicknesses are 1 mm, 1.6 mm, 2 mm, and 3.2 mm. For MCPCBs designed for use in telecommunication power supplies, the typical aluminum substrate thickness is 140 μm with copper foils attached on both sides.

    Aluminum pcb

  • Copper Base

    The regularly used copper-based substrates typically have a tensile strength ranging from 245 to 313.6 N/mm² and an elongation of 12%. The standard thicknesses are 1 mm, 1.6 mm, 2 mm, 2.36 mm, and 3.2 mm.

  • Iron Base

    The iron-based substrates commonly used in production are often cold-rolled steel sheets, belonging to low-carbon steel. They are available in thicknesses of 1 mm and 2.3 mm. Alternatively, phosphorus-containing iron-based substrates are used with thicknesses of 0.5 mm, 0.8 mm, and 1.0 mm.

  • Ceramic Base

    The materials often used for ceramic bases are Al2O3,BeO and AlN.

  • Copper Foil

    The back of the copper foil undergoes a chemical oxidation treatment, while the surface is plated with zinc and brass to increase the peel strength. Copper foil thicknesses commonly used include 17.5μm, 35μm, 75μm, and 140μm.

The Key Characteristics of Metal PCB

  • Heat Dissipation

    Conventional printed circuit board (PCB) substrates like FR4 are generally poor at dissipating heat. In various electronic and power devices, internal heat cannot be promptly removed, leading to rapid component failure. Metal core PCBs exhibit excellent heat dissipation properties due to their high heat capacity and thermal conductivity. The metal core efficiently dissipates heat generated within the board. Connecting the metal core PCBs to the chassis and external heat sinks further enhances heat dissipation. The use of metal core PCBs in electronic devices and communication systems eliminates the need for internal fans, reducing the device’s volume significantly and improving efficiency. This is especially suitable for electronic equipment with enclosures.

  • Thermal Expansion

    Metal core PCBs exhibit a low thermal expansion rate, and their dimensions are much more stable with temperature changes compared to other insulating materials in PCBs. For aluminum-based PCBs and aluminum-clad PCBs, the size changes only 2.5%~3.0% from 30℃ to 140~150℃ meeting the reliable soldering requirements of ceramic chip carrier components.

  • Electromagnetic Shielding

    Metal core PCBs also have shielding capabilities, especially Ceramic Insulated Copper (CIC) core boards. They exhibit good resistance to electromagnetic interference, serving as an alternative to components for heat sinks and effectively reducing the PCB’s size. Additionally, they provide electromagnetic shielding, improving the product’s electromagnetic compatibility and lowering production costs.

The Manufacturing Flow Chart of Metal PCB

Single Sided Metal PCB
Double Sided Metal PCB
Multi-layer Metal PCB