Semiconductor Lid Standoffs for Thermal Interface Material Control
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Solution Overview
Problem
Conventional semiconductor packaging methods face challenges in efficiently managing thermal interface materials during lid assembly, as pre-applied materials tend to smear and stick when stacked, leading to inconsistent application and handling issues during manufacturing and shipping.
Innovation Solution
The integration of standoffs on the semiconductor package lid, formed by pressing structures into the lid, creates a gap that prevents thermal interface material from smearing and provides a protective cover during shipping, allowing for better material handling and uniform application, while also enabling tilt control and hermetic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pre-applied thermal interface material is used on the lid, then thermal management is improved, but the material smears and sticks when lids are stacked during shipping and handling
Solution Approach 1:
The patent segments the lid structure by adding standoffs that create distinct regions - the thermal interface material is applied only in specific areas between the standoffs, separating it from edges that contact other lids during stacking. This segmentation prevents smearing while maintaining thermal contact where needed.
Solution Approach 2:
The standoffs act as intermediary structures that physically separate adjacent lids during stacking. They create a mechanical barrier that prevents the thermal interface material from contacting and sticking to adjacent lids, while still allowing the material to perform its thermal function in the designated contact areas.
2Ease of operation
If standoffs are added to the lid to prevent material smearing, then material handling is improved, but the lid structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into the standoff structure - they serve as both mechanical support elements for the lid and as spacing features that prevent thermal interface material smearing. By combining these functions into a single structural element, the overall complexity is reduced compared to adding separate components.
Solution Approach 2:
The standoffs perform multiple functions simultaneously: they provide structural support for the lid, create spacing to prevent material smearing during stacking, define application areas for the thermal interface material, and contribute to the overall mechanical integrity of the package. This multi-functionality reduces the need for additional separate components.
3Productivity
If thermal interface material is pre-applied to the lid, then manufacturing efficiency is improved, but handling and storage during shipping becomes problematic
Solution Approach 1:
The patent applies the thermal interface material in advance during lid manufacturing, before the lids are shipped and assembled. This preliminary action allows the material to be applied under controlled factory conditions, improving manufacturing efficiency. The standoffs are also formed during this preliminary stage to prevent smearing during subsequent handling and shipping.
Solution Approach 2:
The standoffs provide beforehand protection by creating physical separation between stacked lids during shipping and storage. This prior cushioning prevents the thermal interface material from smearing and sticking to adjacent lids, maintaining reliability throughout the supply chain from manufacturing through final assembly.
Data Source
AI summary
Semiconductor package lid thermal interface material standoffs are disclosed and may include a substrate, a semiconductor die bonded to the substrate, a package lid bonded to the substrate and the semiconductor die thermal interface material in contact the semiconductor die, and standoffs that define a distance between the package lid and the substrate. The package lid may comprise thermal conducting material. The standoff may be within a portion of the thermal interface material. The package lid may provide a hermetic seal with the substrate. A passive device may be bonded to the substrate and covered by the package lid. A standoffs may also be formed on portions of the lid that are not in contact with the substrate. The standoff may be formed on four edges of the package lid. The standoff may comprise structures pressed into the lid.