Meaning
A physical property that quantifies the efficiency of heat transfer through a silicon or organic substrate used in high-density electronic packaging. This interposer thermal conductivity determines how quickly heat generated by a processor can be moved to the heat sink or the printed circuit board. The value is measured in watts per meter-kelvin and varies significantly based on the material composition and the density of through-silicon vias.
Heat Dissipation
Silicon interposers offer much higher performance than traditional organic substrates because of the naturally high conductivity of the base material. Heat flows through the substrate and is further assisted by the vertical copper interconnects that provide a direct thermal path. This mechanism is essential for preventing the formation of hotspots that could degrade the performance of the logic dies.
Material Property
Advanced ceramic or glass materials are sometimes used to achieve a specific balance between thermal expansion and heat transfer. These materials are chosen to match the expansion rate of the silicon chip to reduce mechanical stress during temperature changes. Testing the conductivity requires specialized equipment that can measure small temperature gradients across a very thin sample.
Thermal Performance
System designers use these measurements to create thermal models that predict the operating temperature of the device under full load.
