Leadframe Paddle Packaging for Compact Reliable Semiconductors

The patent transitions from conventional two-dimensional planar packaging to three-dimensional vertical stacking architecture. Multiple semiconductor devices are stacked vertically on the substrate, with through-substrate vias providing electrical interconnections between layers. This dimensional change enables compact packaging while maintaining or improving reliability through reduced interconnect lengths and enhanced thermal management pathways.

The patent implements nested packaging by placing multiple semiconductor devices within a single package footprint. Devices are stacked vertically like nested dolls, with each device layer containing additional functional elements. The leadframe structure is nested within the package, with paddles positioned to contact specific device regions while leads extend outward for external connections.

The patent employs preliminary action by pre-forming through-substrate vias and conductive pathways in the substrate before mounting semiconductor devices. The leadframe is pre-assembled with paddles and leads in their final positions. This preliminary preparation enables faster device assembly and reduces manufacturing steps, lowering costs while improving device performance through precise positioning and reduced interconnect parasitics.

The substrate serves multiple functions simultaneously: it provides mechanical support for stacked devices, establishes electrical interconnections through through-substrate vias, and manages thermal pathways. The leadframe structure performs dual functions of electrical connection and mechanical positioning. This multi-functionality reduces the number of separate components needed, simplifying manufacturing and reducing costs while enhancing device performance.