Multilayer Ceramic Capacitor Electrode Layout Against Moisture Gaps
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in minimizing mounting space while maintaining reliability due to external moisture penetration and impact sensitivity, particularly with L-shaped electrodes that can separate from the ceramic body, leading to weakened reliability.
Innovation Solution
A multilayer electronic component design featuring a body with dielectric layers and internal electrodes, external electrodes with connection and bend portions, and insulating layers that satisfy specific distance relationships to prevent moisture penetration and enhance impact resistance, thereby improving reliability and reducing mounting space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If L-shaped electrode structure is used to minimize mounting space, then mounting space is reduced, but the junction between external electrode and ceramic body becomes easily separated due to external impacts
Solution Approach 1:
The external electrode is divided into two distinct portions: a connection portion that contacts the ceramic body and an extension portion that extends outward. This segmentation allows the connection portion to be optimally designed for strong adhesion to the ceramic body while the extension portion provides the necessary electrical connection, thereby resolving the contradiction between minimizing mounting space and ensuring junction reliability.
Solution Approach 2:
Different portions of the external electrode are given different functional qualities. The connection portion is designed with specific geometric features and material properties to maximize adhesion to the ceramic body, while the extension portion is optimized for electrical connectivity. This local differentiation of quality allows the electrode to simultaneously achieve strong junction reliability and compact mounting footprint.
2Area of stationary object
If L-shaped electrode structure is used to minimize mounting space, then mounting space is reduced, but plating solution or external moisture may pass through the separated gap
Solution Approach 1:
The connection portion of the external electrode is designed in advance with geometric features that ensure complete coverage and sealing of the interface between the electrode and ceramic body. This preliminary design prevents the formation of gaps that could allow moisture or plating solution penetration, thereby protecting against harmful factors while maintaining compact dimensions.
Solution Approach 2:
The connection portion acts as an intermediary element that bridges the ceramic body and the extension portion while simultaneously providing a sealing function. Its specific geometric configuration ensures that it completely covers the interface region, preventing moisture and plating solution from penetrating through potential separation gaps, thus protecting the internal structure.
3Reliability
If external electrode coverage is increased to protect internal electrodes, then reliability is improved, but mounting space increases
Solution Approach 1:
The external electrode transitions from a two-dimensional planar contact to a three-dimensional structure with vertical extension. The connection portion is designed to extend in the thickness direction of the ceramic body, providing comprehensive coverage and protection of the internal electrodes while maintaining a compact footprint in the planar mounting area. This dimensional transition allows enhanced protection without increasing mounting space.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and an internal electrode, an external electrode disposed outside the body, and an insulating layer disposed on the external electrode. The external electrode is disposed to cover an exposed surface of an outermost surface of the electrode layer, and is formed to have a thickness, equal to or less than a thickness of the body, and the insulating layer is disposed to cover an end of the external electrode, to improve moisture resistance reliability.