The VHDL-AMS implementation of BCI ROM enforces heat-flow conservation, like KCL for electronic circuit simulation. This enables the creation of thermal networks to represent multi-component thermal interactions. Component manufacturers can capture the thermal characteristics of their components and provide them to the OEM circuit/system designers. These designers can connect them together through BCI ROMs of their PCBs, on schematics that also include functional electronic circuits. They can then accurately simulate electro-thermal interactions in both steady-state and transient operation.