Metal Core PCB Selection Overview

Since 2008, KnownPCB has partnered with more than 4,000 industry pioneers around the world to tackle challenging PCB projects. In our experience, common metal substrates include Aluminum-based MCPCB, Copper-based MCPCB, and Stainless Steel MCPCB, also known as Insulated Metal Substrate PCB.

The selection of Metal Core PCB is not a simple material replacement. It is a comprehensive decision involving thermal performance, application requirements, mechanical reliability, manufacturing feasibility, and cost efficiency.

Aluminum Core, Copper Core, and Steel Core MCPCBs

Aluminum Core MCPCB

Aluminum core MCPCBs are widely used in high-power LEDs, automotive lighting, and LED lighting systems because of their efficient heat dissipation, lightweight structure, and cost advantages.

• Thermal conductivity: Standard 6061-T6 aluminum typically provides approximately 150–170 W/m·K. High-purity aluminum or specialized grades may further improve thermal performance.
• Thermal path: In a finished MCPCB, the dielectric layer is usually the primary bottleneck for heat flow. Thermal performance should be evaluated by thermal resistance, dielectric thickness, dielectric thermal conductivity, copper thickness, and the actual heat-spreading path.
• Power density: Aluminum core MCPCBs can support applications with power densities of up to 10 W/in² and can help reduce LED or component junction temperature.

Typical Applications

• LED panels and street lighting
• Automotive headlights and taillights
• Outdoor LED displays
• Power modules and motor driver boards

Copper Core MCPCB

Copper core MCPCBs are suitable for designs with demanding thermal management requirements, especially in high-power-density electronics where faster heat spreading is required.

• Bulk thermal conductivity: Copper base materials typically provide about 380–400 W/m·K, significantly higher than aluminum.
• Thermal path performance: Copper cores can improve lateral heat spreading. However, in conventional IMS stack-ups, the through-thickness thermal path is still largely dictated by the dielectric layer.
• Power density: Copper core PCBs are suitable for high-power-density applications of 15 W/in² or higher, including 5G base-station RF modules and high-power IGBT modules.

Typical Applications

• 5G base-station RF modules
• Industrial power supplies and inverters
• High-power laser modules and medical electronics

Steel Core MCPCB

Steel core MCPCBs, including stainless steel and iron-based metal core PCBs, are selected less for thermal conductivity and more for mechanical strength, corrosion resistance, and electromagnetic shielding performance in harsh operating environments.

• Thermal conductivity: Steel and stainless steel base materials generally have lower thermal conductivity than copper and aluminum. Stainless steel is typically around 15–20 W/m·K depending on grade.
• Mechanical rigidity: Steel core MCPCBs can provide significantly higher mechanical rigidity than FR-4, with improved resistance to vibration and mechanical shock.
• EMI shielding: Certain steel grades can provide inherent electromagnetic shielding and help reduce electromagnetic interference.
• Cost efficiency: Steel-based MCPCBs can be cost-effective for mechanically demanding applications where thermal conductivity is not the only selection factor.

Typical Applications

• Engine control units, or ECUs
• PV inverters and servo drives
• Defense electronics and railway control systems
• Marine and deep-sea equipment

MCPCB Material Comparison

Cost Budget Selection

The cost budget selection of metal-based PCBs can be matched according to thermal performance, material cost, processing complexity, purchase volume, reliability requirements, and end-use application.

Aluminum-Based MCPCB

In our experience at KnownPCB, aluminum core PCBs usually provide the lowest raw material and processing cost among the three material types. Aluminum core PCB is a cost-effective choice for conventional projects where cost control, heat dissipation, and lightweight structure are key concerns.

Copper-Based MCPCB

Copper core PCBs are generally more expensive than aluminum-based PCBs. They are recommended for projects with stricter thermal conduction requirements, such as 5G base stations, high-power charging systems, high-current modules, and power electronics with high heat dissipation demands.

Stainless Steel-Based MCPCB

Stainless steel core PCBs are typically used in special applications with high requirements for structural strength, hardness, wear resistance, and corrosion resistance. They are suitable for applications such as military underwater sensing, precision instrument support, marine electronics, and harsh-environment equipment.

Mechanical Integrity and Environmental Adaptability

In high-stakes environments, the mechanical integrity of a PCB is as critical as its electrical performance. At KnownPCB, material durability is evaluated based on real-world stress, thermal load, vibration, corrosion, and operating environment.

Aluminum-Based MCPCB

For weight-sensitive devices such as portable lighting and outdoor LED screens, aluminum PCBs provide a good balance of lightweight design, durability, thermal performance, and cost efficiency.

Copper-Based MCPCB

Copper-based PCBs provide better thermal spreading and ductility than aluminum-based designs. They are often used in applications where high current, high heat, and mechanical stress must be managed together.

Stainless Steel MCPCB

Stainless steel core PCBs provide high hardness, wear resistance, corrosion resistance, and mechanical support. They are suitable for special equipment requiring structural pressure support, vibration resistance, or long-term operation in harsh environments.

The KnownPCB team helps customers balance extreme performance demands with commercial feasibility through multi-dimensional material evaluation and stack-up review.

Typical Applications

LED lighting modules, tail lights, DC-DC converters, power control units, and thermal management boards for consumer electronics.