Multilayer Capacitor Electrode Layout for Low ESL Moisture Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) with multi-terminal structures face challenges in achieving low equivalent series inductance (ESL) while maintaining sufficient moisture resistance reliability due to the lead-out portions of internal electrodes, which act as pathways for moisture penetration.
Innovation Solution
The proposed solution involves a multilayer electronic component design with a body comprising stacked dielectric layers and internal electrodes, where connection electrodes are embedded and extend in specific directions to connect internal electrodes to external electrodes, with margin portions disposed on the connection electrodes to enhance moisture resistance and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-terminal structure with three or more terminals is used to lower ESL, then the equivalent series inductance is reduced, but moisture resistance reliability deteriorates due to lead-out portions serving as penetration paths
Solution Approach 1:
The patent introduces a lead-out portion as an intermediary structure between the internal electrode and external electrode. This lead-out portion is specifically designed with a configuration that extends along the external electrode, creating a longer moisture penetration path. The lead-out portion acts as a mediator that maintains electrical connectivity while impeding moisture access to the internal electrode, thus resolving the contradiction between maintaining low ESL and improving moisture resistance.
2Reliability
If lead-out portions are formed on internal electrodes for connection to multiple external terminals, then connectivity is improved, but moisture resistance reliability deteriorates
Solution Approach 1:
The patent resolves the contradiction by transitioning the lead-out portion from a simple planar connection to a three-dimensional structure that extends along the external electrode in a direction substantially perpendicular to the stacked direction. This dimensional change allows the lead-out portion to achieve both electrical connectivity and moisture protection functions without significantly increasing structural complexity, as the extension utilizes the vertical space already available in the multilayer capacitor architecture.
3Adaptability or versatility
If internal electrodes are connected to multiple external electrodes through lead-out portions, then multi-terminal functionality is achieved, but moisture penetration paths are created
Solution Approach 1:
The patent segments the electrode connection structure into distinct functional portions: the internal electrode, the lead-out portion, and the external electrode. The lead-out portion is further segmented to extend along different external electrodes, with each segment maintaining electrical connectivity while creating a longer moisture penetration path. This segmentation allows the structure to achieve multi-terminal functionality while systematically addressing moisture resistance at each connection point.
Data Source
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AI summary
A multilayer electronic component includes: a body including a stacked portion including a dielectric layer and first and second internal electrodes alternately disposed with the dielectric layer interposed therebetween, first and second connection electrodes connected to opposing respective ends of the first and second internal electrodes in two orthogonal directions, and margin portions respectively disposed on the first and second connection electrodes; and first and second external electrodes respectively disposed on the body and connected to the first and second connection electrodes. The first connection electrode includes a first main portion in contact with at least a portion of the first internal electrode and a first lead-out portion extending from the first main portion, and the second connection electrode includes a second main portion in contact with at least a portion of the second internal electrode and a second lead-out portion extending from the second main portion.