The Physics of Heat Dissipation in PCBA

According to the law of energy conservation, the portion of input electrical energy not converted into useful work (loss) is almost entirely transformed into heat energy. If this heat cannot be dissipated in time, the PCBA temperature will continue to rise, leading to functional issues. Therefore, thermal management is not an "option" but a mandatory physical requirement for maintaining normal operation of electronic systems.

Thermal Solution Material Selection

Selecting the right material is crucial for building an efficient thermal path. The following are the three most common interface material choices:

1. For Ultimate Performance: Aluminum Heatsink + Thermal Grease

Offers excellent thermal conductivity, perfectly fills microscopic gaps, and achieves almost gap-free heat transfer.

2. For Convenience & Insulation: High-Conductivity Silicone Pad

Ideal for pre-installation, or where vibration damping and electrical insulation are needed. Compressible to adapt to different gaps.

3. For Low Power & Easy Installation: Thermal Double-Sided Tape

Suitable for components with low heat generation requiring simplified installation (adhesive fixation). 1 Tap 2 Aluminum plate 3 PCBA

Application Scenarios

The following are typical thermal management solutions for high-power components:

CPU/GPU Chips

Best Practice: Use an aluminum channel heatsink paired with thermal grease (for performance) or a high-conductivity silicone pad (for maintainability and insulation) as the interface material.

High-Power LED Beads

Core Solution: Aluminum substrate paired with a large aluminum heatsink. The interface between them can be chosen based on the process: use thermal double-sided tape for strong bonding when thermal resistance requirements are not extreme, or use thermal grease for lower thermal resistance.

Characteristics of Aluminum Heatsink Shapes

Most standard parallel fin designs are mass-produced via extrusion, offering the best cost-effectiveness. More complex shapes may require die-casting, milling, or folding processes, resulting in higher costs.