Color-Coded MLCC Mounting Substrate for Low Inductance
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Solution Overview
Problem
Multilayer ceramic capacitors mounted on substrates face challenges in maintaining low insertion loss characteristics due to difficulties in determining the orientation of internal electrodes, leading to variations in equivalent series inductance and insertion loss, especially in high-frequency regions.
Innovation Solution
A mounting substrate design with a multilayer ceramic capacitor having internal electrodes parallel or perpendicular to the mounting surface, where the external electrodes cover the end and principal surfaces, and the internal electrodes are connected to these external electrodes, ensuring a consistent orientation and reduced equivalent series inductance, thereby minimizing variations in insertion loss characteristics across different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the multilayer ceramic capacitor is mounted with internal electrodes perpendicular to the mounting surface to reduce equivalent series inductance, then insertion loss characteristics in high-frequency regions are improved, but it becomes difficult to determine the laminating direction by appearance, leading to mounting orientation errors and variation in insertion loss
Solution Approach 1:
The patent applies different colored glazes to different surfaces of the multilayer ceramic capacitor. Specifically, the first principal surface and second principal surface (opposed in the laminating direction) are covered with a first glaze having a first color, while the first side surface and second side surface (opposed in the width direction) are covered with a second glaze having a second color. This color coding allows easy visual identification of the laminating direction, ensuring correct mounting orientation while maintaining the low insertion loss characteristics achieved by perpendicular internal electrode arrangement.
2Loss of energy
If alignment is performed in advance to ensure internal electrodes are perpendicular to the mounting surface, then equivalent series inductance is reduced, but additional cost and time are required for alignment, and insertion loss characteristics still vary if orientations are wrong
Solution Approach 1:
The patent incorporates the orientation identification function into the capacitor component itself during manufacturing, rather than requiring separate alignment procedures during mounting. By pre-applying different colored glazes to different surfaces during the capacitor manufacturing process, the laminating direction is permanently marked and easily identifiable during mounting, eliminating the need for complex pre-alignment procedures while ensuring correct orientation for minimal equivalent series inductance.
Solution Approach 2:
The patent uses color-coded glazes to provide visual cues for correct mounting orientation. The first glaze (first color) is applied to the first and second principal surfaces, while the second glaze (second color) is applied to the first and second side surfaces. This allows mounters to quickly identify the laminating direction without complex alignment tools or procedures, reducing both the complexity and cost of the mounting process while ensuring optimal electrical characteristics.
Data Source
AI summary
A multilayer ceramic capacitor connected to an output electrode and an input electrode of a mounting substrate includes a laminated body. In the laminating direction of the laminated body, the shortest distance from an outer first internal electrode to the surface of an external electrode on the side closer to a first principal surface, and the shortest distance from an outer second internal electrode to the surface of an external electrode on the side closer to a second principal surface are each about 40 μm or less. In the width direction of the laminated body, the shortest distance from an end of an internal electrode to the surface of the external electrode on the side closer to a first side surface, and the shortest distance from an end of an internal electrode to the surface of the external electrode on the side closer to a second side surface are each about 40 μm or less.