Multilayer Capacitor Side Margin Structure for Crack Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to cracks in the side margin portions, which are prone to damage and crack propagation, especially when the thickness of these portions is reduced for miniaturization and high capacitance.
Innovation Solution
The multilayer electronic component design includes side margin portions with a controlled Sn amount gradient, where the region adjacent to internal electrodes has a lower Sn content, gradually increasing to the outer region, to suppress crack occurrence and propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the side margin portion is reduced to maximize electrode area, then capacitance per unit volume is improved, but reliability is lowered due to increased crack susceptibility
Solution Approach 1:
The side margin portion is designed with non-uniform thickness: a first thickness in a first region adjacent to the electrode and a second thickness greater than the first thickness in a second region adjacent to the outside. This local variation in thickness provides mechanical strength where needed (near the electrode) while maintaining minimal overall thickness to maximize electrode area and capacitance per unit volume.
Solution Approach 2:
The side margin portion is divided into two distinct regions with different thickness characteristics: a first region closer to the electrode with smaller thickness, and a second region closer to the outside with greater thickness. This segmentation allows each region to fulfill its specific function - the first region minimizes space consumption while the second region provides structural support and crack resistance.
2Volume of moving object
If the side margin portion thickness is uniformly reduced, then device size is minimized, but cracks are more easily generated and propagated
Solution Approach 1:
Instead of uniform thickness reduction, the side margin portion implements local quality variation with two distinct thickness regions. The first region has minimal thickness to reduce overall device volume, while the second region has greater thickness to maintain mechanical strength and prevent crack propagation, thereby resolving the contradiction between miniaturization and strength.
Solution Approach 2:
The second region with greater thickness acts as a pre-designed protective zone that cushions against external impacts and prevents cracks from propagating into the electrode region. This beforehand cushioning structure ensures that even when the overall device size is minimized, sufficient strength is maintained to prevent crack-related failures.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and internal electrodes disposed in a first direction with the dielectric layer interposed therebetween, and having first and second surfaces opposing each other in the first direction, third and fourth surfaces opposing each other in a second direction, and fifth and sixth surfaces opposing each other in a third direction; side margin portions disposed on the fifth and sixth surfaces; and external electrodes disposed on the third and fourth surfaces. Each of the side margin portions includes a first region adjacent to the internal electrodes, and a second region adjacent to an outside of each of the side margin portions. An average Sn amount of the first region is lower than an average Sn amount of the second region. An Sn amount of the first region gradually increases from a side of the internal electrodes to the second region.