QFP Leadframe Integrating Power Bars and Ground Rings
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Solution Overview
Problem
Current quad flat pack (QFP) semiconductor packages face limitations in increased I/O capacity and size reduction, with power bars and ground rings in existing leadframes being structurally unstable and requiring external support, leading to electrical noise and poor thermal performance.
Innovation Solution
A leadframe design for QFP packages that integrates power bars and ground rings as integral parts, eliminating the need for external support structures and optimizing lead placement to maximize exposed leads, while using standard low-cost forming techniques to enhance stability and reduce package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power bars and ground rings are added to increase I/O capacity, then electrical functionality is improved, but structural stability deteriorates requiring external support
Solution Approach 1:
The patent integrates power bars and ground rings as integral parts of the leadframe structure, merging previously separate components into a unified design. This eliminates the need for external support structures while maintaining structural stability and enhancing I/O capacity with better thermal and electrical performance.
2Adaptability or versatility
If lead length is increased to accommodate more I/O, then functionality is improved, but package size increases
Solution Approach 1:
The patent utilizes the bottom surface area of the package by exposing the die pad and arranging leads in a quad flat pack configuration. This dimensional optimization allows increased I/O capacity without proportionally increasing package volume, as leads are strategically positioned to maximize space utilization.
3Device complexity
If power bars are made integral to reduce complexity, then manufacturing is simplified, but structural support is reduced
Solution Approach 1:
The power bars are formed as integral portions of the leadframe, combining previously separate support structures into a unified component. This merging reduces manufacturing complexity and eliminates the need for external support while the leadframe's inherent strength provides sufficient structural support for the semiconductor device.
Data Source
AI summary
In accordance with the present invention, there is provided a semiconductor package (e.g., a QFP package) including a uniquely configured leadframe sized and configured to maximize the available number of exposed leads in the semiconductor package. More particularly, the semiconductor package includes a generally planar die pad or die paddle defining multiple peripheral edge segments. In addition, the semiconductor package includes a plurality of leads. Some of these leads include bottom surface portions which, in the completed semiconductor package, are exposed and at least partially circumvent the die pad, with other leads including portions which protrude from respective side surfaces of a package body in the completed semiconductor package. The semiconductor package also includes one or more power bars and/or one or more ground rings which are integral portions of the original leadframe used to fabricate the same.