Thermal Pad

A thermal pad is a pre-formed sheet of conductive, pliable material, usually silicone loaded with ceramic or other fillers, placed between a heat-producing component and its heatsink. Like thermal paste, its job is to displace insulating air from the contact interface, but a pad arrives at a fixed thickness and conforms under pressure rather than flowing like a grease.

Pad versus paste

The two solve different problems. Paste is best for tight, flat interfaces such as a bare die against a polished heatsink, where it forms an extremely thin, low-resistance layer. A pad shines where there is a measurable gap or an uneven surface, for example secondary components that sit lower than the main chip, because it spans the space that paste cannot fill. Pads are also forgiving to install, peel-and-place rather than spread-and-judge, and many are electrically insulating, which protects nearby traces. The trade-off is higher thermal resistance than a well-applied thin paste layer on a flat contact.

Durability and use in miners

A practical advantage for hardware that runs hot for years is longevity: quality pads do not dry out, crack, or pump out the way paste can under repeated thermal cycling, so they hold their performance over long deployments. In ASIC repair, pads are typically reserved for gap-filling roles, while the primary chip-to-heatsink joint stays on paste for the lowest resistance. Choosing the wrong one, a thick pad where a thin paste belongs, needlessly raises chip temperature.

For the paste it complements and the failure mode it resists, see Thermal Paste and Pump-Out Effect.