MLCC Internal Electrode Layout for Stable Contact and Capacitance
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Solution Overview
Problem
Ultra-small multilayer ceramic capacitors (MLCCs) face issues with contact failure between internal and external electrodes due to reduced thickness and width, leading to reduced capacitance and capacitance dispersion.
Innovation Solution
A multilayer electronic component design with internal electrodes extending to one surface and connected to external electrodes, where the thickness (T1) and width (W1) of the central portion satisfy specific ratios (T1>T2 and 0.6≤W2/W1≤0.9) to enhance contact area and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness and width of the internal electrode are reduced to achieve ultra-small MLCC size, then the component size is reduced, but contact failure between internal electrode and external electrode occurs more easily
Solution Approach 1:
The internal electrode is designed to extend to one surface of the body (third or fourth surface) rather than being fully enclosed, creating a new dimensional configuration. This allows the electrode to emerge at a surface where the external electrode can be directly connected, effectively adding a surface-dimension interface that improves contact reliability without increasing the overall component volume.
Solution Approach 2:
The internal electrode exhibits non-uniform dimensions along its length: the central portion has thickness T1 and width W1, while the portion at the body center has thickness T2 and width W2, where T1>T2 and W2/W1 is between 0.6-0.9. This local variation in electrode dimensions allows the central portion to provide better contact area with the external electrode while maintaining the overall small size of the component.
2Volume of moving object
If the thickness and width of the internal electrode are reduced, then the component size is reduced, but capacitance decreases or capacitance dispersion occurs
Solution Approach 1:
The internal electrode is designed with varying dimensions along its length, where the central portion has greater thickness (T1>T2) and appropriate width (W2/W1 between 0.6-0.9) compared to the portion at the body center. This local quality variation ensures that the capacitance-forming region maintains sufficient electrode area for stable capacitance while the overall component remains ultra-small.
Solution Approach 2:
By extending the internal electrode to one surface of the body and configuring it with specific dimensional ratios, the patent creates an optimized capacitance structure that achieves stable capacitance in an ultra-small form factor, resolving the contradiction between size reduction and capacitance stability.
3Reliability
If the internal electrode thickness is increased to improve contact area, then contact reliability improves, but the component cannot achieve ultra-small thickness
Solution Approach 1:
The internal electrode has different thicknesses at different locations: the central portion has thickness T1 while the portion at the body center has thickness T2, where T1>T2. This allows the central portion to provide sufficient contact area with the external electrode for reliable contact, while the overall component thickness remains controlled by the thinner T2 region, enabling ultra-small form factor.
Solution Approach 2:
The patent extends the internal electrode to one surface of the body (third or fourth surface) rather than maintaining uniform thickness throughout. This dimensional configuration allows the electrode to provide adequate contact area at the surface where external connection is made, while keeping the overall component thickness minimal for ultra-small application.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and an internal electrode disposed alternately with the dielectric layer in a first direction, the internal electrode exposed to one exposed surface among the third and fourth surfaces opposing each other in a second direction and spaced apart from the fifth and sixth surfaces opposing each other in a third direction, and an external electrode disposed on the exposed surface. When a thickness and a width of a central portion of the internal electrode in the third direction, measured on the exposed surface, are respectively denoted by T1 and W1, and a thickness and a width of the central portion of the internal electrode, measured on a central portion of the body in the second direction, are respectively denoted by T2 and W2, T1>T2 and 0.6≤W2/Wi≤0.9 are satisfied.