Multilayer Capacitor Electrode Layout for Low ESL and Flexural Strength
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges with high equivalent series inductance (ESL), which deteriorates electronic device performance, and require enhanced flexural strength for applications in miniaturized and high-reliability electronic components, especially in automotive systems.
Innovation Solution
A multilayer electronic component design featuring a body with dielectric layers, internal electrodes, external electrodes, and a dummy electrode that penetrates through the capacitance formation portion, reducing current loops and improving electrode filling rate to enhance flexural strength and prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of current loops is increased to reduce ESL, then ESL is reduced, but the device complexity increases
Solution Approach 1:
The first internal electrode is segmented into multiple portions (first through fourth portions) that are spatially separated and connected through lead portions. This segmentation allows the creation of multiple current loops without requiring a single complex continuous electrode structure, thereby reducing ESL while managing device complexity through modular electrode design
Solution Approach 2:
The electrode structure transitions from a planar two-dimensional arrangement to a three-dimensional configuration with electrodes extending in multiple directions (first, second, and third directions) and connecting through lead portions. This dimensional change enables the formation of multiple current loops in different spatial planes, reducing ESL without proportionally increasing complexity
2Strength
If the electrode filling rate is increased to enhance flexural strength, then flexural strength is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The lead portions of the internal electrodes are nested within the body structure, connecting different portions of the same electrode type (e.g., first lead portion connects first and second portions, second lead portion connects third and fourth portions). This nesting approach increases electrode filling rate and flexural strength while the modular design simplifies alignment requirements compared to a fully continuous complex electrode pattern
Solution Approach 2:
Different regions of the electrode structure have different functions: main portions provide capacitance formation with high filling rate for strength, while lead portions provide electrical connection with optimized paths for low ESL. This local differentiation allows optimization of each region's properties without uniformly increasing manufacturing precision requirements across the entire structure
3Reliability
If the internal electrodes are disposed perpendicular to the mounting surface to reduce current loops, then ESL is reduced, but the device complexity increases
Solution Approach 1:
The internal electrodes are divided into multiple portions (first through fourth portions) with different orientations and positions. The first and second portions extend in a first direction, while third and fourth portions extend in a second direction perpendicular to the first direction. This segmentation reduces current loops and ESL while making the electrode configuration more manageable and less complex than a single perpendicular electrode structure
Solution Approach 2:
The electrode configuration utilizes three-dimensional space with electrodes extending in multiple directions (first direction, second direction, and third direction for lead portions). This multi-dimensional arrangement reduces current loop areas for lower ESL while distributing the complexity across different spatial dimensions rather than concentrating it in a single plane
Data Source
AI summary
A multilayer electronic component includes a body including a plurality of dielectric layers, and a capacitance formation portion including first and second internal electrodes alternately disposed in a third direction with the dielectric layer interposed therebetween, the body including first and second surfaces opposing in a first direction, third and fourth surfaces connected to the first and second surfaces and opposing in a second direction, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing in the third direction, external electrodes disposed on the body, and a dummy electrode disposed to penetrate through the capacitance formation portion in the third direction.