Printed Circuit Boards (PCBs) do not inherently possess thermal insulation capabilities; their primary design objective is typically efficient heat dissipation rather than the prevention of heat transfer. However, in specific application scenarios where "thermal insulation" or thermal isolation is required, the following methods can be employed:
Blocking Heat Conduction Paths: By means of material selection and structural design, reduce the conduction of heat from high-temperature regions to low-temperature regions.
Mitigating the Effects of Thermal Radiation and Convection: Establish barriers between high-temperature sources and sensitive components to minimize heat exchange resulting from thermal radiation and airflow.
Use Substrates with Low Thermal Conductivity: In areas requiring thermal insulation, employ standard resin-based substrates-such as FR-4 (with a thermal conductivity of approximately 0.3 W/m·K)-and avoid the use of highly conductive metal substrates (e.g., aluminum substrates).
Increase Air Gaps: Utilize air as a natural thermal insulator by designating non-conductive regions between PCB layers or beneath components to minimize heat conduction.
Localized Copper Isolation: Avoid large-area copper connections around sensitive components; instead, employ a "Thermal Relief" pad design to restrict heat flow into the copper layer.
Addition of Thermal Insulation Materials: Apply flexible thermal insulation pads-such as polyimide (PI), ceramic fiber, or aerogel-with low thermal conductivity to the PCB surface or directly over the components.
Physical Separation Layout: Spatially separate high-heat-generating components from temperature-sensitive components (such as sensors, crystal oscillators, and electrolytic capacitors) to prevent thermal crosstalk.
Shielding Design: Install metal or ceramic shields over high-heat regions, and fill the interior of the shields with thermal insulation material to block thermal radiation and convection.
