Wire Bond Via Package Stacking for Small-Pitch Microcontacts

The patent replaces conventional etching processes with a wire bonding process that uses mechanical deposition to form conductive structures. Wire bonds are deposited through openings in the substrate to create microcontacts, enabling high aspect ratios and small pitches that cannot be achieved through etching alone. This mechanical substitution resolves the contradiction by achieving superior manufacturing precision without excessive process complexity.

The patent changes the fundamental parameters of microcontact formation by transitioning from subtractive etching to additive wire bonding. This allows control over aspect ratio and pitch through wire bond geometry and placement parameters rather than being constrained by etching process limitations. The parameter change enables achieving aspect ratios and pitches beyond conventional capabilities.

The patent segments the interconnect structure into multiple components: wire bonds for flexible routing, conductive elements for electrical connection, and encapsulation layers for protection. This segmentation allows the package to maintain a compact footprint while providing versatile interconnect configurations through the flexible wire bond segments that can be routed as needed.

The patent utilizes the vertical dimension by forming wire bonds that extend through the substrate thickness, creating microcontacts with high aspect ratios. This three-dimensional approach allows compact footprint while maintaining interconnect flexibility, as wires can be routed vertically and laterally to achieve complex connections within a small planar area.

The patent employs composite structures combining wire bonds, conductive elements, and encapsulation materials to create reliable stacked package interconnections. The wire bonds provide mechanical strength and electrical conductivity, while the encapsulation layers provide protection and structural support. This composite approach enhances connection reliability in stacked arrangements by distributing mechanical and electrical functions across multiple materials.

The patent incorporates encapsulation layers that protect wire bonds and conductive elements before they are subjected to mechanical and electrical stresses. This protective cushioning is built into the structure beforehand, shielding the delicate interconnections in stacked packages from damage and ensuring long-term reliability under operational conditions.