The ability to eliminate heat is crucial for electronics to operate properly. As components get smaller and closer together, it is more difficult to dissipate generated heat. Gap-fillers, also called thermal pads, are essential components in electronic assembly to ensure proper power transfer from the electronic devices to the dispersing medium (or heat sink) that will keep them cool and functioning optimally.
There are so many different types on the marketplace that it can be difficult to select. Some are gels that need refrigeration and are dispensed with a nozzle, while others are like putty that can be squeezed out of a tube. There are some that can be cured in-place on the PCB, using a system of pressure mapping that creates a map of pressure distribution.
It is important to consider both the hardness and conformability of a material when choosing a gap filler. The higher the hardness, the less the material will conform to a surface and can lead to air gaps between the mating surfaces. Softer gap-fillers with low modulus that are flexible and more flexible will adapt better to different surface topologies and eliminate air-gaps.
What is Thermal Gap Pad ,Thermal pads are not only cost-effective but also protect delicate components. They can also prevent mechanical damage on circuit boards by absorbing vibrations. Depending on the product, some thermal pads can also be used for moisture protection or corrosion prevention by acting as an airtight barrier. They can even be used as light electrical insulators to improve reliability.
The softness of the gap filler allows it to conform to the mating parts, creating a tight fit and eliminating air bubbles for better heat dissipation. This is crucial for applications that have high surface temperatures or require a thinner pad to prevent putting excessive stress on components or heat sinks.
Some of these thermo pads are formulated in a way that includes a special reinforcement to help increase the handling strength and cut through resistance. This helps to preserve their integrity and reduce re-work while still allowing them to die-cut using standard steel-rule-die.
Thermal gap filler can be die-cut in a variety shapes and sizes to allow for a more precise assembly. Most of them can also be bonded onto the mating surfaces using an appropriate glue. It’s important that you choose an adhesive that meets NASA’s outgassing standards to avoid contaminating sensitive cameras and optical parts. Thermal gap fillers may also be available in pre-cut versions to make the process more convenient.