IC Package Lead Frame Raised Features for Stability
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Solution Overview
Problem
Integrated circuit packages face mechanical instability and bending issues due to thin leads, which can affect the accuracy of magnetic field sensors under shock or vibration, especially when a ferromagnetic object is present, leading to unintended position changes of the sensing elements.
Innovation Solution
Incorporating raised features along the length of the leads in the lead frame, which increases mechanical stiffness and reduces bending, while allowing for a thinner lead frame design that reduces material costs and enhances stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the lead frame uses thin leads to reduce material costs, then material cost decreases, but mechanical stability and resistance to bending deteriorate
Solution Approach 1:
The lead frame leads are segmented into multiple sections with different thicknesses. The distal portion (farther from the die) has a reduced thickness to save material, while the proximal portion (closer to the die) maintains a greater thickness to provide mechanical support and resist bending. This segmentation allows the lead frame to use less material overall while maintaining the necessary mechanical stability in critical areas.
2Loss of substance
If the lead frame uses thin leads to reduce material costs, then material cost decreases, but position tolerance and sensor accuracy deteriorate
Solution Approach 1:
The leads are divided into sections with different thicknesses, where the thicker proximal section provides a stable mechanical foundation that maintains position tolerance, while the thinner distal section reduces material usage. This segmentation ensures that the critical positioning function is maintained in the thicker section while achieving material savings in the less critical distal section.
Solution Approach 2:
Different sections of the lead frame have different local qualities (thicknesses) optimized for their specific functions. The proximal portion has greater thickness to provide mechanical stability and maintain position tolerance, while the distal portion has reduced thickness to minimize material usage. This local differentiation of quality allows the structure to meet both mechanical stability and material efficiency requirements.
Data Source
AI summary
An integrated circuit package includes a lead frame having a first surface, a second opposing surface, at least one die attach portion configured to support at least one die, and a plurality of leads, wherein at least one of the leads has a raised feature extending along a portion of a length of the lead.