Multilayer Ceramic Capacitor ESL Reduction via Electrode Thickness Ratio
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Solution Overview
Problem
Multilayer ceramic electronic components face increased equivalent series inductance (ESL) issues as they become smaller and higher in capacitance, leading to performance deterioration, particularly due to internal electrode compression which can result in cracking, delamination, and increased current paths.
Innovation Solution
A multilayer ceramic electronic component design with a ceramic body having a width smaller than its length, featuring internal electrodes with a thickness ratio of 0.5 to 2.0 to the ceramic layer thickness, and a compression ratio of 0.9 to 0.97 for side portions, along with thicker lead-out portions to reduce electrode density differences, is implemented. The manufacturing method involves laminating 250 or more internal electrodes between ceramic layers, compressing side portions, and forming external electrodes on side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of internal electrodes is increased to achieve higher capacitance, then capacitance increases, but equivalent series inductance (ESL) increases leading to performance deterioration
Solution Approach 1:
The patent optimizes the thickness ratio of internal electrodes to ceramic layers within 0.5≤Te/Td≤2.0, and controls the compression ratio of side portions to 0.9≤Ta/Tm≤0.97, achieving a balance between high capacitance and low ESL by adjusting dimensional parameters
2Stability of the object's composition
If side portions are compressed to reduce electrode density difference, then electrode density uniformity improves, but internal electrodes may break or bend increasing current path and ESL
Solution Approach 1:
The patent precisely controls the compression ratio parameter 0.9≤Ta/Tm≤0.97 to achieve uniform electrode density without causing internal electrode damage, thereby maintaining low ESL and stable current paths
3Volume of moving object
If the component size is reduced to achieve smaller form factor, then miniaturization is achieved, but ESL increases causing performance deterioration
Solution Approach 1:
The patent maintains low ESL in miniaturized components by optimizing the thickness ratio of internal electrodes to ceramic layers within 0.5≤Te/Td≤2.0 and controlling side portion compression to 0.9≤Ta/Tm≤0.97, achieving a balance between small size and low ESL
Data Source
AI summary
There is provided a multilayer ceramic electronic component, including: a ceramic body having external electrodes; and internal electrodes disposed between ceramic layers within the ceramic body, the ceramic body having a width smaller than a length thereof and the number of laminated internal electrodes being 250 or more, wherein when the thickness of the ceramic layer is denoted by Td and the thickness of the internal electrode is denoted by Te, 0.5≤Te/Td≤2.0, and when the thickness of a central portion of the ceramic body is denoted by Tm and the thickness of each of side portions of the ceramic body is denoted by Ta, 0.9≤Ta/Tm≤0.97, and thus, a multilayer ceramic electronic component having low equivalent series inductance (ESL) may be obtained.