MLCC Internal Electrode Coverage Layout for Lower DC Resistance
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face increased DC resistance due to reduced internal electrode thickness, leading to decreased connectivity and metal coverage, which affects their performance and reliability.
Innovation Solution
The multilayer ceramic capacitor design includes internal electrode layers with specific extension portions and connection regions that enhance metal coverage and connectivity, ensuring higher coverage of the dielectric layers, thereby reducing DC resistance and preventing delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thicknesses of the internal electrodes are reduced to increase the number of laminated layers, then the capacitance increases, but the internal electrodes are liquefied and coagulated during sintering, causing coverage decrease and DC resistance increase
Solution Approach 1:
The patent applies local quality by creating different coverage ratios in different regions of the internal electrodes. The extension portions have a coverage ratio of 80% or more, while the central portions have a coverage ratio of less than 80%. This local differentiation ensures that the extension portions maintain high connectivity and low DC resistance, while the central portions can be optimized for capacitance by using thinner electrodes.
2Quantity of substance
If the thicknesses of the internal electrodes are reduced to increase the number of laminated layers, then the capacitance increases, but the connectivity between internal electrodes and external electrodes decreases
Solution Approach 1:
The patent applies local quality by creating different coverage ratios in different regions of the internal electrodes. The extension portions have a coverage ratio of 80% or more, ensuring high connectivity and low DC resistance, while the central portions have a coverage ratio of less than 80%, allowing for thinner electrodes and higher capacitance.
3Quantity of substance
If the coverage of internal electrode layers with respect to dielectric layers is decreased, then the area of current path decreases and resistance increases, but reducing electrode thickness increases capacitance
Solution Approach 1:
The patent applies local quality by creating different coverage ratios in different regions of the internal electrodes. The extension portions have a coverage ratio of 80% or more to maintain low DC resistance and high connectivity, while the central portions have a coverage ratio of less than 80% to allow for thinner electrodes and higher capacitance.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body and three or more external electrodes. A first internal electrode layer includes a first counter electrode portion, a first extension portion, and a second extension portion. The first counter electrode portion includes a first central region, a first connection region connected to the first extension portion, and a second connection region connected to the second extension portion. Coverages of the first and second connection regions with respect to the dielectric layers are higher than a coverage of the first central region with respect to the dielectric layers, and coverages of the first and second extension portions with respect to the dielectric layers are higher than the coverage of the first central region with respect to the dielectric layers.