Multilayer Capacitor Electrode Structure for Moisture and Warpage Control
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with resistance reliability due to exposed internal electrodes, which can lead to moisture permeation and reduced mechanical strength, and warpage stress due to the use of brittle ceramic materials, leading to cracks and reduced lifespan.
Innovation Solution
The design incorporates dummy electrodes that are spaced apart from the main internal electrodes, reducing the exposed area and minimizing warpage, with external electrodes covering the dummy electrodes to prevent moisture ingress and enhance mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exposed area of the internal electrode is reduced to improve resistance reliability, then moisture permeation is reduced, but a step difference defect with the dielectric layer occurs
Solution Approach 1:
The internal electrode is segmented into a main body portion and a lead portion with different exposed areas. The lead portion has a reduced exposed area compared to the main body, allowing it to minimize moisture exposure while the main body maintains proper alignment with the dielectric layer, thus avoiding step difference defects.
Solution Approach 2:
Different portions of the internal electrode are given different properties: the main body portion has a larger exposed area for proper dielectric alignment, while the lead portion has a reduced exposed area for improved resistance reliability. This local differentiation resolves the contradiction between the two requirements.
2Reliability
If the exposed area of the internal electrode is reduced to prevent moisture ingress, then resistance reliability improves, but warpage stress increases due to brittle ceramic material
Solution Approach 1:
The internal electrode is divided into a main body portion that maintains larger dimensions for structural support and warpage resistance, and a lead portion with reduced exposed area for moisture protection. This segmentation allows both reliability and strength requirements to be satisfied simultaneously.
Solution Approach 2:
The internal electrode exhibits asymmetric geometry where the lead portion has different dimensions compared to the main body portion. This asymmetric design allows the main body to provide structural strength while the lead portion minimizes moisture exposure, resolving the contradiction between reliability and warpage strength.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer, and internal electrode layers disposed alternately in a first direction with the dielectric layer, and; first and second external electrodes disposed on the third and fourth surfaces, respectively, wherein internal electrode layer includes a main portion and an internal electrode extending from the main portion and connected to the external electrode through the lead portion, and a dummy electrode spaced apart from the internal electrode and connected to the external electrode, and a width of the lead portion may be smaller than a width of the main portion, at least a portion of the dummy electrode overlap the internal electrode in a length direction, and the dummy electrode may not overlap the internal electrode of another layer in a laminate direction.