Wafer Scale Heat Slug for IC Package Thermal Management

The patent combines the heat slug attachment process with the die attach process by integrating the heat slug into the carrier substrate before die mounting. This merging of steps eliminates separate heat slug attachment operations, reduces process complexity, and ensures proper thermal contact from the beginning of packaging.

The heat slug is pre-positioned and attached to the carrier substrate before the die is mounted. This preliminary action ensures that the thermal management structure is already in place and properly aligned, simplifying subsequent die attach operations and eliminating the need for separate heat slug positioning steps.

The patent applies a protective coating or encapsulation material before the main encapsulation process to prevent the molding compound from contacting and displacing the wire bonds. This preliminary protective action counteracts the harmful effect of wire sweep before it can occur during encapsulation.

The patent introduces an intermediary layer or protective structure between the wire bonds and the encapsulation material. This intermediary element acts as a barrier that prevents the molding compound from directly contacting and displacing the wire bonds during the encapsulation process.

The patent combines multiple wire bonding operations into a single automated process step by using pre-formed wire arrays or ribbons that can be attached to multiple bond pads simultaneously. This merging of operations maintains connection reliability while dramatically reducing the number of separate bonding steps required.

The patent replaces traditional mechanical wire bonding techniques with alternative connection methods such as conductive adhesives, solder paste, or printed circuit board trace connections. These substitutions eliminate the need for repeated mechanical wire attachment operations while maintaining electrical connectivity and improving throughput.

The patent implements localized thermal management solutions by positioning heat slugs directly under high-power density regions of the die. This local quality approach concentrates thermal management resources where they are most needed, effectively dissipating heat from critical high-speed circuitry without requiring uniform thermal management across the entire device.

The patent uses composite thermal management structures combining multiple materials with different thermal conductivities. These composite structures include high-conductivity heat slug materials (such as copper or aluminum) combined with thermally conductive but electrically insulating materials, creating an optimized thermal pathway that effectively dissipates heat from high-density circuitry while maintaining electrical isolation.