Semiconductor Package Clip Constriction for Heat-Restricted Switching

The patent applies parameter changes by carefully controlling the resistance and impedance values of the electrical interconnections. Each interconnection is designed with specific resistance values (e.g., R1, R2, R3, R4) and impedance characteristics that are matched to achieve symmetric switching behavior. This parameter matching allows multiple dies to switch synchronously without requiring complex interconnect routing, thus resolving the contradiction between high current capacity and interconnect congestion.

The patent applies local quality by creating a non-uniform geometry in the metal clips through local constrictions. The clips have varying cross-sectional areas along their length, with narrower sections (constrictions) positioned at specific locations. This local geometric variation creates corresponding local variations in thermal conductivity, allowing the clips to maintain high electrical conductivity in load-bearing regions while introducing thermal resistance at the constriction points to block heat flow from the die to the package terminal, thus preventing overheating.

The patent introduces metal clips with local constrictions as intermediary elements between the discrete type III-V semiconductor devices and the package terminals. These intermediary clips serve a dual function: they provide efficient electrical connection for low-power-loss operation while simultaneously acting as thermal barriers through their constricted geometry. The constrictions create localized thermal resistance that blocks heat flow, allowing the high-efficiency III-V devices to operate without transferring excessive heat to the package terminals, thus resolving the heat dissipation management challenge.