Today’s world is experiencing a major shift in all processes and machines. All activities are becoming automated by incorporating a centralised control unit. This control unit is majorly made of several components and Printed Circuit Boards (PCBs). PCBs have enabled the functioning of countless devices, gadgets, industrial equipment and machinery. Depending on the requirement and specification, PCBs come in various materials and designs. One of the special kinds is metal core PCB, having several advantages over regular PCBs in certain applications.
What is a Metal Core PCB?
Metal core PCB has a metal-based core between the layers. A regular PCB is prepared with the aid of using a conducting layer of copper over an insulating layer, normally called fibreglass (FR4). The circuit traces are etched out over the copper layer to make electrical conductivity between the components. This layer is adjusted over the FR4 substrate layer. The PCB substrate layer acts as a strong base for the circuit. In metal core PCB, the substrate material is metal like aluminium or an alloy of conducting metals. Aluminium is the most used metal core material for PCB due to its lightweight and cost-effectiveness. Since, copper and metal core are both conductors of electricity, an insulating layer is inserted between the copper layer and metal layer to make an insulation barrier.
Advantages of Metal Core PCB
Compact and Efficient Product Layout - In regular PCBs, to dissipate the generated heat during the operations, additional cooling assemblies or heat sink assemblies are required. This makes PCB bulky in design. In metal core PCBs, the core metal layer itself acts as a heatsink which further eliminates the need for additional cooling assembly. Integrating high-power and high-density components into the required space without altering the product performance is the most critical task for PCB and product designers.
Better Heat Dissipation - In high-power applications, heat generation is a common phenomenon. This heat needs to be transferred frequently for the PCB and product to function reliably. The metal core layer absorbs the heat effectively and spreads across the entire surface area. In this way, the complete heat is extracted from the PCB. This event also reduces the possibility of uneven heat accumulation over the PCB surface, which may damage any particular component or section of the PCB. So metal core PCB has popularity in PCB fabrication manufacturers.
Cost-effective Solution - The initial cost of the metal core seems high due to metal processing costs. But the overall cost at the end PCB is much more effective in the long run also. The absence of the additional cooling assembly and heat sink part is removed from the final cost of the PCB assembly. Also, the product life is longer due to better heat management, which indirectly results in a lower operational and replacement cost of the product.
Greater Durability and Reliability - The usage of a metal layer in the PCB core enhances the overall strength of the PCB. Outside elements such as mechanical stress and thermal stress have little effect on the metal core PCB assembly. The metal core inside the PCB makes the PCB more suitable for high-temperature applications.
Limitations of Metal Core PCBs
Not Useful for Low-Power Applications - Metal core PCBs are more useful in high-power applications in which heat generation is a key factor. In low-power applications, the quantity of heat generated is extensively lower. The metal core is of little use for this kind of situation. The product and PCB cost for the low-power applications is also limited, which does not require integration of the metal core inside the PCB assembly.
Flexibility Issues - Designing the PCB with metal core has a few design degree-demanding situations. Due to the presence of a metal core, there is very limited scope available for circuit routing. This restricts the complex and high-density circuit design with metal core PCB. For multi-layer PCB stack-up, the correct order of the layers is critical in order to maintain the heat transfer effectively.
Soldering Challenges - Soldering is a vital process in PCB assembly which creates a permanent electrical connection among the components and board. Soldering calls for a specific temperature range wherein solder melts and is applied to the PCB surface. The core absorbs the heat and dissipates it from the PCB, which results in difficulty in the soldering process. Hence, the soldering of the metal core PCB requires additional precision and care.
Maintaining Thermal Profile - Maintaining the thermal profile across the PCB is sometimes challenging. As the metal core absorbs the heat and further dissipates it. Under certain conditions, heat accumulates in some specific areas of the PCB, which need to be evacuated with the help of additional cooling methods. Also, the mismatch in the thermal expansion coefficient of the metal and copper may lead to stress and failure of the PCB under extreme temperature conditions.
Application of Metal Core PCBs
- LED Lighting Solution - LED lighting has become very popular in current lighting systems due to its longer lifespan and energy efficiency. Metal core PCBs are widely used in LED lights due to efficient heat dissipation for consistent performance.
- Consumer Electronics - Compact user devices and gadgets incorporate metal core PCBs for effective thermal management and long life.
- Automobile Solution - The automobile sector is integrating various lighting and automation features into the latest models. For longer lifespans and longer runs, metal core PCBs are used in these systems.
- Medical Equipment - Medical equipment is required to work with more precision and consistency under harsh conditions. To fulfil this requirement, metal core PCBs are used to manufacture and assemble these kinds of products.
Conclusion
Metal core PCBs are completely unique sorts of PCBs designed and manufactured with metal substrates to provide better thermal management for products. By means of presenting effective thermal management, high-power applications can be implemented. The need for compact and energy-efficient systems is continuously increasing, and metal core PCBs are having a prime role in meeting those challenges. No matter having some limitations in manufacturing and during application, metal core PCBs nevertheless continue to be a premier choice for high-power applications with effective heat management. A reliable metal core PCB fabrication manufacturer is the key to the ideal product. So we need to pay attention to the current flow of the manufacturing markets.