Lead Frame Support Structure for DFN Lead Bending Resistance
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Solution Overview
Problem
Existing lead frames for DFN packages are prone to deformation during transportation due to the leads' susceptibility to bending, which can deteriorate the characteristics of electronic components.
Innovation Solution
A lead frame design featuring support leads with a cross-sectional second-order moment ratio that makes them less likely to bend, connected to the main leads to stabilize them, and a frame structure that includes connection bars and support leads to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If leads are made long in one direction to facilitate mounting and electrical connection, then ease of operation and electrical connectivity are improved, but the leads become more susceptible to deformation during transportation
Solution Approach 1:
The lead frame structure is segmented into multiple functional components: connection bars for electrical connection, support leads for mechanical stability, and terminal leads for mounting. This segmentation allows each part to perform its specific function optimally while the support leads provide structural reinforcement to prevent deformation of the terminal leads during transportation.
2Ease of manufacture
If the lead frame structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but the ability to suppress lead deformation during transportation deteriorates
Solution Approach 1:
The lead frame employs a composite structural design combining connection bars and support leads into a unified framework. This composite structure provides enhanced mechanical strength and deformation resistance while maintaining manufacturability through standard lead frame fabrication processes. The integrated design achieves both structural stability and manufacturing ease.
3Stability of the object's composition
If support leads with optimized cross-sectional moment of inertia are added to prevent lead bending, then lead shape stability is improved, but device complexity increases
Solution Approach 1:
Support leads are strategically positioned and dimensioned to provide localized reinforcement where bending stresses are most likely to occur during transportation. The cross-sectional dimensions of support leads are optimized to achieve sufficient moment of inertia for bending resistance while minimizing overall structural complexity and material usage.
Data Source
AI summary
A lead frame includes a die pad, a plurality of leads, at least one support lead, and a frame member. The frame member includes two first connection bars and two second connection bars. The plurality of leads include a plurality of specific leads. The plurality of specific leads are each connected to the first connection bar. At least one of the specific leads is connected to the second connection bar via the at least one support lead. The cross-sectional second-order moment of a cross section of the at least one support lead perpendicular to a Y direction around an X axis is equal to or more than the cross-sectional second-order moment of a cross section of the at least one support lead perpendicular to an X direction around a Y axis.