Thermal pad is a soft or elastic thermal interface material designed to transfer heat between a component and a heatsink or other cooling surface. Unlike thermal paste, a pad has a defined physical thickness and can compensate for a larger gap between two surfaces.

Thermal pads are commonly used where a component cannot directly contact the heatsink. The pad compresses during assembly and provides a thermal path between the two surfaces.

Where Thermal Pads Are Used

  • electronic components separated from a heatsink by a defined gap;
  • chips or components connected to metal heat spreaders;
  • cooling assemblies where surfaces have different heights;
  • selected ASIC miner and power supply designs.

Thermal Pad vs Thermal Paste

Thermal paste is primarily intended to fill microscopic surface irregularities between two closely contacting surfaces. A thermal pad provides both thermal transfer and physical gap filling.

For this reason, pads are selected not only by thermal conductivity but also by thickness, compressibility, and mechanical properties. A pad that is too thick or too rigid can create excessive mechanical pressure or interfere with other components.

Importance in Mining Hardware

The condition of thermal pads can affect the temperature of individual components in ASIC miners. Aging, loss of elasticity, or incorrect pad thickness can reduce heat transfer.

Replacement requires a pad with appropriate thickness and thermal characteristics. A thermal pad should not automatically be replaced with a thick layer of thermal paste because the two materials serve different mechanical and thermal functions.