MLCC Electrode Layout for Low ESL and Moisture Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face challenges in achieving low Equivalent Series Inductance (ESL) and moisture resistance reliability, particularly when exposed to humid environments, as moisture permeation occurs through the interface between external electrodes and ceramic bodies, degrading performance.
Innovation Solution
The design includes internal electrodes connected to external electrodes through lead-out portions, with a ratio of lead-out portion length to external electrode length (A/B) of 0.75 or less, minimizing overlap and optimizing the connection interface to reduce ESL and moisture permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is extended to cover the entire surface of the body for low ESL properties, then high-frequency performance is improved, but moisture permeation increases through the electrode-body interface
Solution Approach 1:
The external electrode is designed with non-uniform coverage: it covers the entire first surface (for low ESL) but is intentionally restricted from covering the second surface (to prevent moisture permeation). This local differentiation of electrode coverage resolves the contradiction between high-frequency performance and moisture resistance.
Solution Approach 2:
The patent converts the potential harm of reduced electrode coverage (which might increase ESL) into a benefit by strategically positioning the electrode restriction only on the second surface while maintaining full coverage on the first surface, thus achieving both low ESL and moisture resistance simultaneously.
2Reliability
If the lead-out portion length is increased to improve connection, then electrical connectivity is enhanced, but moisture permeation pathway is extended
Solution Approach 1:
The lead-out portion is designed with differentiated functionality: it extends sufficiently from the first surface to ensure excellent electrical connectivity with external circuits, but is intentionally restricted from extending onto the second surface, thereby eliminating the moisture permeation pathway while maintaining electrical performance.
3Strength
If the external electrode covers the entire surface for mechanical strength, then structural integrity is improved, but moisture resistance deteriorates
Solution Approach 1:
The external electrode provides comprehensive coverage on the first surface to ensure mechanical strength and low ESL, but is intentionally absent from the second surface to prevent moisture permeation, thus locally optimizing both structural integrity and moisture resistance.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and an internal electrode, and an external electrode disposed on the body. The internal electrode is connected to the external electrode through a lead-out portion. With respect to a cross-section of the internal electrode in the second and third directions, when an average length of the lead-out portion in contact with the external electrode is defined as “A” and an average length of the external electrode, connected to the lead-out portion, in contact with the body is defined as “B,”“A/B” is 0.75 or less.