Multilayer Ceramic Capacitor Electrode Width Ratio for Moisture Resistance
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Solution Overview
Problem
Thin multilayer ceramic capacitors have low moisture-resistance reliability due to the increased equivalent series resistance (ESR) and equivalent series inductance (ESL) caused by narrower lead-out portions, which are smaller than the body portions contributing to capacitance generation.
Innovation Solution
The ratio of the width of the lead-out portions to the body portions of the internal electrodes is adjusted to satisfy 0.3≤w2/w1≤0.5, allowing for a balance between reducing ESR and ESL while maintaining reliability, by ensuring the lead-out portions are narrower than the body portions but not excessively so.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the lead-out portion is made much smaller than that of the body portion to prevent moisture-resistance deterioration, then reliability is improved, but equivalent series resistance (ESR) and equivalent series inductance (ESL) increase
Solution Approach 1:
The patent applies parameter changes by optimizing the width ratio of the lead-out portion to the body portion within a specific range (0.05 ≤ w2/w1 ≤ 0.5). This quantitative parameter adjustment resolves the contradiction by finding the optimal balance point where reliability is improved without causing excessive increases in ESR and ESL, rather than using an extremely narrow lead-out portion.
Solution Approach 2:
The patent applies partial action by making the lead-out portion narrower than the body portion (but not excessively so), achieving partial reduction in moisture exposure while maintaining acceptable electrical performance. The width ratio is set to a specific range rather than making the lead-out portion minimally narrow, thus achieving partial optimization of both reliability and electrical characteristics.
2Productivity
If the mounting area is reduced to meet higher mounting density requirements, then productivity is improved, but moisture-resistance reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the lead-out portion width ratio within a specific range (0.05 ≤ w2/w1 ≤ 0.5). This allows the capacitor to achieve compact dimensions for high mounting density while maintaining adequate moisture-resistance reliability through the optimized geometric parameter, thus resolving the contradiction between productivity and reliability.
3Adaptability or versatility
If the thickness of the capacitor is reduced to enable embedding in substrate or LSC mounting, then adaptability is improved, but moisture-resistance reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the lead-out portion width ratio (0.05 ≤ w2/w1 ≤ 0.5) which compensates for the reduced thickness. This allows thin capacitors to be embedded in substrates or mounted in LSC configurations while maintaining adequate moisture-resistance reliability through the optimized geometric parameter, resolving the contradiction between adaptability and reliability.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body comprising dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween. The first internal electrode comprises a body portion contributing to the capacitance generation and a lead-out portion having a narrower width than the body portion and an end exposed from a surface, and the second internal electrode comprises a body portion contributing to the capacitance generation and a lead-out portion having a narrower width than the body portion and an end exposed from another surface. A ratio (w2/w1) of a width (w2) of the lead-out portion of the first and second internal electrodes to a width (w1) of the body portion satisfies 0.3≤w2/w1≤0.5.