How to Dissipate Heat Effectively in Electronic Devices?

Why does the performance of the electronic devices you manufacture tend to fluctuate, and why are your after-sales costs so high? This may be due to overheating. Especially as today’s electronic products become increasingly slim and lightweight, your choice of cooling solutions has become increasingly important.

Why Do Electronics Need Heat Dissipation?

Where Does the Heat in Electronic Devices Come From?

Chips and Processors

When CPUs, GPUs, and MCUs operate at high performance in electronic devices such as gaming consoles, AI computing systems, and industrial control equipment, they perform high-speed computations that generate large amounts of heat. This causes their temperatures to rise rapidly, with the heat concentrated on the small surface area of the chips.

If your cooling system cannot dissipate the heat quickly enough, the device may trigger thermal protection, throttle the hardware to prevent damage, or even crash.

Power Devices

Power management modules such as MOSFETs, IGBTs also generate a significant amount of heat during the switching process, and because of their high power density, you need to use a more strict thermal design.

Battery System

Battery systems in electronic devices generate heat during both charging and discharging. If your product is designed for fast charging or high-current discharge, it may generate even more heat. Excessive battery temperatures not only accelerate battery degradation and reduce battery life but may also pose safety risks.

LEDs and Display Modules

LEDs operate by converting electrical energy into light energy. The wasted electrical energy is converted into heat, causing the temperature to rise. You must use an appropriate heat dissipation solution for the LEDs and display modules in electronic devices to prevent overheating from affecting luminous efficiency, which can lead to light decay and color shift.In LED lighting systems, thermal management is also critical for performance stability.

High-Frequency Communication Module

5G/RF modules typically require continuous working and generate heat during operation, so the right heat dissipation is necessary to achieve stable performance and prevent performance fluctuations and downtime.

Function of Dissipating Heat in Electronics

Allow the Equipment to Operate Normally

By quickly dissipating heat, the heat-generating components of electronic devices can operate continuously at their best operating temperature, preventing instability issues such as stuttering, lag, and system crashes.

Improve Equipment Performance

Effective cooling prevents devices from triggering overheating protection, helps them maintain high operating frequencies, and maximizes performance. It is a must for high-performance devices used in gaming, data processing, and other applications.

Extend the Service Life of Components

If electronic devices are operated in high-temperature environments for extended periods, it can accelerate wear and tear and shorten their lifespan. A good cooling system can help extend the life of your devices.

Improve Equipment Reliability

Heat dissipation not only improves equipment performance but also prevents equipment damage and mitigates safety risks in extreme conditions, thereby making the electronic devices you produce more reliable.

Common Ways to Dissipate Heat in Electronics

Thermal Interface Materials(TIMs)

Thermal interface materials replace air as the filling material between heating elements and heat sinks or enclosures. With their high thermal conductivity and high filling capacity, they minimize thermal resistance and create efficient heat transfer paths for your electronic devices. Thermal interface materials come in many materials, forms, and performance characteristics, allowing you to select the right option for different devices.

Main Types of Thermal Interface Materials

• Thermal Pads: As pre-formed thermal interface materials, thermal pads are easy to install and offer different selection of sizes and thermal conductivities. They can be used for both small and large gaps (0.2–20 mm) and for low or high thermal loads.
• Thermal Paste: Thermal paste is a flowable thermal interface material that provides greater fill capability than thermal pads. If the surface of your electronic components has many minor irregularities and the gap between them and the housing or heat sink is small, thermal grease is a good choice.
• Thermal Putty: Thermal putty is also a flowable thermal interface material. However, it is better for displacing air in larger gaps and offers higher thermal conductivity and a longer service life than thermal grease.
• Phase Change Materials: Phase change materials are typically solid at room temperature but transform into a paste-like form when they absorb heat. As a result, they combine the advantages of both thermal paste and thermal pads. Although they are more expensive, they achieve more precise temperature control.
• Thermal Tape: Thermal tape is a thermal interface material that provides both adhesion and heat dissipation, so it is a good choice for low-heat-load, thin, and lightweight electronic devices.

Thermal Interface Material Types

Air Cooling

Air cooling is a method of heat dissipation that relies on air to carry away heat. It primarily comes in two forms: natural convection and forced air cooling. Natural convection needs the air to carry away heat, while forced air cooling uses fans to further improve cooling efficiency. You need to use it with a heat sink, and it is good for you to use it in computers, power supply systems, communication equipment, industrial computers, and similar applications.

Advantages of Air Cooling

• Simple Design: Air-cooling systems feature a simple design that can be integrated into most of your devices and provide stable heat dissipation in low- to medium-power applications.
• Low Cost: Air-cooling solutions are affordable and have low operating costs, so they can be used for electronic devices with limited budgets.

Disadvantages of Air Cooling

• Low Cooling Efficiency: Compared to other cooling methods, it is not very efficient. In addition, since it relies on air, you’d better use it in well-ventilated areas with lower ambient temperatures.
• High Noise Levels: If you use a fan for forced air cooling, the moving parts can generate significant noise, and it is unsuitable for noise-sensitive applications.
• Large Structure: If you are looking for the right cooling method for compact or portable devices, air cooling is not a good choice.

Heat Sink

Heat sinks are typically made from materials with high thermal conductivity, such as aluminum and copper, which efficiently dissipate the heat transferred to them. You can choose from different types of heat sinks, including finned, extruded, die-cast, and stamped designs, and use them together with thermal interface materials to achieve high heat dissipation efficiency.

Advantages of Heat Sinks

• High Reliability: The heat sink is made of metal and has no moving parts. As a result, it requires less maintenance and is less prone to damage compared to air-cooled solutions. You can choose it for electronic devices that are built to last, achieving a longer service life.
• Quiet Operation: It dissipates heat without the need for a fan, thereby eliminating noise. So you can use it in audio or silent electronic devices.
• Zero Power Consumption: The heat sink operates without consuming electricity, and it does not influence the battery life of electronic devices. Therefore, it is a wise choice if you are seeking a cooling solution for mobile phones, tablets, or other portable devices.
• Customizable: You can customize the size and shape of the heat sink based on your product’s structure and available space to achieve an optimal layout.

Disadvantages of Heat Sinks

• Performance is Limited by Size: Generally, heat sinks with larger surface areas offer better heat dissipation performance. If you need to use a heat sink for electronic devices with high heat loads, you will need to allocate more space. Although copper heat sinks provide better heat dissipation, they are also heavier. Therefore, they may not meet your needs for compact devices with high heat loads.
• High Environmental Requirements: Heat sinks rely on air convection to dissipate heat. Consequently, their cooling efficiency is significantly reduced when used in applications with high ambient temperatures. Additionally, it is generally not recommended for you to use them in enclosed devices.

Heat Pipe / Vapor Chamber

Heat pipes are sealed, hollow metal structures filled with liquid. Vapor chambers, on the other hand, are flat heat pipes with a more compact design. Both heat pipes and vapor chambers are highly efficient heat-conducting components that can also help reduce local hotspots for your heating element. You can use it in compact electronic devices that require high heat dissipation, such as laptops, graphics cards, smartphones, servers, and gaming devices.

Advantages of Heat Pipes and Vapor Chambers

• High Heat Dissipation Efficiency: Heat pipes and vapor chambers can rapidly distribute the heat generated by heating elements to the surface of the fins or plate, thereby quickly transferring heat. As a result, they are well-suited for high-performance, compact devices and help maintain the stable working of high-power equipment.
• Even Heat Dissipation: For hotspots such as CPUs, GPUs, and power modules, heat pipes and vapor chambers can quickly dissipate heat and prevent temperature concentration. This helps prevent damage caused by localized overheating and further improves the reliability of your electronic products.
• Compact Design: Heat pipe structures can be custom-designed to fit the space available in your device and can be bent or flattened. Vapor chambers are very thin, typically less than 2 mm. You can use them in devices with limited space, such as laptops, smartphones, and graphics cards, enabling efficient heat dissipation within confined spaces.

Disadvantages of Heat Pipes and Vapor Chambers

• High Cost: Because heat pipes and vapor chambers have more complex manufacturing processes, they are more expensive than standard air-cooling solutions and heat sinks. Ultra-thin, large-area heat spreaders are even more expensive than heat pipes, so they are better suited to high-end electronic devices.
• Use with Other Cooling Components: Heat pipes and vapor chambers are responsible for heat diffusion and heat transfer. In electronic devices, heat sinks and other components are also used to dissipate heat further. They can also be used with thermal interface materials to create more efficient heat transfer pathways.

Liquid Cooling

Unlike vapor chambers and heat sinks, liquid cooling is an active cooling method that uses circulating water or coolant. Due to its higher thermal capacity, liquid cooling provides your equipment with greater sustained cooling performance. It is commonly used in high-power electronic devices, such as servers, data centers, and battery systems.

Advantages of Liquid Cooling

• High Heat Dissipation Capacity: Liquid cooling offers far better heat dissipation performance compared to air cooling, allowing your equipment to operate continuously under heavy loads. It also maintains a stable operating temperature for your equipment, minimizing performance degradation caused by temperature fluctuations.
• Resistance to Thermal Shock: Liquid cooling can absorb large amounts of heat in a shorter time. If your equipment suddenly operates at full load, liquid cooling can effectively buffer temperature changes, achieving stable operation.
• Low Noise: Compared to air-cooling systems that need high-speed fans running continuously, liquid cooling typically offers better cooling performance at lower noise levels and can be used in products with strict noise requirements.

Disadvantages of Liquid Cooling

• Low Reliability: Liquid cooling has many components, such as pumps, coolant, and hoses, and has a complex structure. Compared to other cooling methods, it is more prone to leaks and damage, which can lead to cooling failure. You should consider other alternatives for electronic devices that require high reliability.
• Complex Maintenance: Liquid cooling needs regular inspection of seals, replacement of coolant, and cleaning of pumps and cooling channels. They incur additional maintenance time and costs for your products.
• High Cost: Liquid cooling is typically more expensive than other thermal management solutions. Additionally, the use of pumps and coolant results in higher operating costs. Maintenance costs are also higher. Therefore, it is not cost-effective for you to choose them for low-power products.
• Large Space Requirement: Due to the greater number of components and increased weight, it is only suitable for high-power equipment with larger space.

Heat Dissipation Ways of Electronics

FAQs

Can Electronics Work Without Cooling?

Almost all electronic devices have a cooling design to make sure normal working. If your electronic device has very low power consumption, passive cooling can be achieved using a metal casing, heat sinks, or proper ventilation. However, for high-performance electronic products such as computers, smartphones, servers, and industrial equipment, you must use a good cooling solution.

Are Thermal Pads Better than Thermal Paste?

Thermal pads and thermal paste are both excellent thermal interface materials, and which one is better depends on your application. Thermal pads are easy to install and have a long service life, so they are ideal for automated production and gap-filling applications. Thermal paste, on the other hand, offers extremely low thermal resistance and is a good choice for high-performance equipment. However, it has a shorter service life.

Are Heat Pipes Better than Heat Sinks?

Heat pipes and heat sinks have different purposes. Heat pipes are responsible for rapidly conducting heat, while heat sinks are responsible for dissipating heat into the air. For standard devices, using a heat sink alone is enough to meet cooling needs. For high-heat-generating products such as laptops, graphics cards, and servers, heat pipes are better. You can also use both heat pipes and heat sinks together for your electronic devices.

How Do Thermal Pads Reduce Component Temperature?

Thermal pads dissipate heat from electronic components by filling gaps and increasing thermal conductivity. On the one hand, thermal pads replace air and compensate for surface irregularities, thereby minimizing thermal resistance. On the other hand, thermal pads have high thermal conductivity, creating more efficient heat transfer pathways to dissipate heat more quickly.

Are Thermal Interface Materials Safe for Electronic Components?

Most common thermal interface materials, such as thermal pads, thermal grease, and thermal putty, are electrically insulating. They can be used in consumer electronics, automotive electronics, and industrial equipment to offer electrical safety between electronic components. However, some special TIMs, such as graphite thermal pads, are conductive and require more attention to electrical isolation during use.

What Are the Signs of Poor Heat Dissipation in Electronics?

When electronic devices do not dissipate heat properly, the following issues may occur:

• Abnormally high case temperatures
• Fans running continuously at high speed and producing noise
• Slow system performance and lag
• Reduced performance in games or applications
• Automatic reboots or sudden shutdowns
• Significantly reduced battery life
• Device instability after prolonged use

This requires timely inspection and optimization of the cooling system design.

Which Is Better for Heat Sinks, Aluminum or Copper?

Copper heat sinks offer better thermal conductivity and can be used in high-power and high-thermal-density devices. However, they are heavier, which is not friendly for portable electronic devices. Aluminum heat sinks, on the other hand, are lightweight and more cost-effective, but they do not provide the same level of heat dissipation as copper heat sinks. Therefore, if you need higher heat dissipation, copper is the better choice. If cost and weight are your main concerns, aluminum is the better option.

Final Thoughts

You should select the most appropriate solution based on the device’s power rating, available space, operating environment, and budget. At GALLOP INNOTEK, we not only provide high-performance electronic TIM solutions but also offer professional selection guidance to improve thermal design efficiency. Contact us today!