Multilayer Capacitor Electrode Layout for Low ESL and 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 the lead-out portions of internal electrodes create pathways for moisture penetration, worsening moisture resistance reliability
Solution Approach 1:
The patent extracts the harmful lead-out portions from the internal electrodes and replaces them with connection electrodes formed on the external electrode surfaces. This separation removes the moisture penetration pathway while maintaining the electrical connection function, thereby improving moisture resistance reliability without excessive structural complexity
Solution Approach 2:
The patent introduces connection electrodes as intermediary elements that bridge the internal electrodes and external electrodes. These connection electrodes are formed on the external electrode surfaces and provide electrical connectivity without creating moisture pathways, serving as a mediator that resolves the contradiction between low ESL and moisture resistance
2Reliability
If lead-out portions are formed on internal electrodes to connect to external electrodes, then connectivity is achieved, but these lead-out portions serve as major paths for external moisture or plating solution penetration
Solution Approach 1:
The patent removes the lead-out portions from the internal electrodes and relocates the connection function to separate connection electrodes formed on the external electrode surfaces. This extraction eliminates the moisture penetration pathway while preserving the electrical connectivity between internal and external electrodes
Solution Approach 2:
The connection electrodes act as intermediary elements that provide the necessary electrical connection between internal and external electrodes without creating direct pathways for moisture or plating solution penetration. They mediate the connection function while blocking harmful factor transmission
Data Source
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.