Thermal Adhesive Bonding for BGA Heat Spreader Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor packaging methods face challenges in efficiently dissipating heat from high-performance chips, as they rely on expensive and less reliable thermal conductivity materials, and existing solutions like internal heat spreaders and dummy dies are costly and complex to manufacture.
Innovation Solution
The use of a thermal adhesive to directly bond an internal heat spreader to the functional die, optionally with a dummy die, provides a low thermal conductivity path for heat dissipation without the need for expensive materials, utilizing standard package materials and existing manufacturing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If expensive mold compounds with higher thermal conductivity are used, then heat dissipation is improved, but cost increases and reliability decreases
Solution Approach 1:
An internal heat spreader is introduced as an intermediary component between the functional die and the external environment. The heat spreader conducts heat away from the die through its high thermal conductivity, then dissipates it through the package walls, eliminating the need for expensive mold compounds while maintaining reliable heat dissipation pathways
Solution Approach 2:
The heat dissipation function is segmented into separate components: the functional die generates heat, the internal heat spreader conducts and distributes it, and the package walls dissipate it to the environment. This segmentation allows each component to be optimized independently, using standard materials throughout
2Temperature
If internal heat spreader is used, then heat dissipation path is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The internal heat spreader serves multiple functions simultaneously: it acts as a thermal conductor, a structural support element, and a bonding substrate for the dummy die. This multi-functionality reduces the total component count and simplifies manufacturing while maintaining effective heat dissipation
3Temperature
If dummy die is placed on top of functional die, then thermal proximity to heat spreader is improved, but device complexity increases
Solution Approach 1:
A dummy die made from standard silicon substrate material is placed on the functional die to improve thermal contact with the heat spreader. The dummy die serves purely as a thermal management component without active circuitry, simplifying the overall device architecture while enhancing thermal proximity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves thermal dissipation by 10-20% with minimal cost increase and maintains reliability, while being compatible with existing manufacturing processes and materials, including Low-K dielectric devices.
Implementation Method 1
a thermal adhesive is used to bond an internal heat spreader to an active functional die
Data Source
AI summary
In a semiconductor chip, a thermal adhesive is used to bond an internal heat spreader to an active functional die. In an alternative embodiment a dummy die is place directly on top of the active functional die and a thermal adhesive is used to bond an internal heat spreader to the dummy die. This provides a direct and relatively low thermal conductivity path from the heat source, i.e., the functional device to the top of the package, that is, the internal metal heat spreader which is also exposed to the air.