Leadframe Die Pad Recess Protrusion Wire Length Adjustment
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Solution Overview
Problem
Conventional leadframes lack the ability to adjust the length of wires connecting the die to the leads, resulting in consistent wire length and increased manufacturing costs due to inefficient wire consumption.
Innovation Solution
The leadframe features a die pad with recess and protrusion portions, allowing for varying lengths of first and second leads, enabling adjustable wire lengths through the use of recess and protrusion portions, which correspond to the leads, thereby reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the die pad has aligned opposite sides with equal-length leads, then the structure is simple and easy to manufacture, but the wire length cannot be adjusted resulting in increased wire consumption and manufacturing cost
Solution Approach 1:
The die pad is segmented into multiple sides with recess portions and protrusion portions, allowing different leads to have different lengths. This segmentation enables wire length adjustment while maintaining a relatively simple overall structure that is easy to manufacture.
Solution Approach 2:
The die pad transitions from a symmetric design with equal-length leads to an asymmetric design with varying lead lengths. The recess and protrusion portions create asymmetric geometries that allow different wire lengths to be accommodated, solving the wire consumption problem while maintaining manufacturing simplicity.
2Loss of substance
If all leads have the same length, then the manufacturing process is simplified, but wire consumption increases due to inability to optimize wire length
Solution Approach 1:
Different leads are given different local qualities in terms of length based on their specific functional requirements. The recess and protrusion portions enable each lead to have the optimal length for its particular connection needs, reducing overall wire consumption while maintaining adequate manufacturing precision through standardized fabrication processes.
3Ease of manufacture
If the die pad structure is modified with recess and protrusion portions, then wire length can be adjusted to reduce cost, but the manufacturing complexity increases
Solution Approach 1:
The die pad geometry is segmented into recess and protrusion portions that can be integrated into standard manufacturing workflows. This segmentation allows for cost-effective wire length optimization while the modular nature of the segments keeps the overall manufacturing process relatively simple and scalable.
Data Source
AI summary
A leadframe includes a die pad and a plurality of leads corresponding to the die pad. The die pad for supporting a die is formed with a plurality of sides, each of the sides having at least one recess portion and at least one protrusion portion. The leads are substantially coplanar to the die pad. The leads include a plurality of first leads and a plurality of second leads. The first leads extend into the recess portions respectively, and the second leads are aligned with the protrusion portions. The length of the first leads is greater than that of the second leads. The length of wires electrically connecting the die to the leads or the die pad can be adjusted by the sides of the leadframe with the recess portion and the protrusion portion having a dimension corresponding to the leads, so as to save the manufacture cost of the leadframe.