Three-Terminal MLCC with Penetrating Electrode for Low ESL
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face challenges in achieving high capacitance per unit volume due to size miniaturization and difficulties in implementing three-terminal type external electrodes, which also increases mounting area and equivalent series inductance.
Innovation Solution
A capacitor component design featuring a body with dielectric layers and internal electrodes, margin portions, and connection parts, where the first and second margin portions cover the connection parts, and a connection electrode penetrates through the body to connect the internal electrodes, reducing the need for external lead parts and enhancing capacitance per unit volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the MLCC is reduced according to miniaturization demand, then the mounting area is reduced, but it becomes difficult to secure high capacitance
Solution Approach 1:
The patent introduces a three-terminal configuration with external electrodes extending in multiple directions (first, second, and third directions) rather than conventional two-terminal opposite placement. This dimensional expansion allows current to flow through multiple paths simultaneously, reducing ESL and maintaining high capacitance performance in a smaller footprint package.
Solution Approach 2:
The capacitor is divided into multiple terminal segments (first external electrode, second external electrode, and third external electrode) with internal electrodes (first internal electrode, second internal electrode, third internal electrode) arranged in alternating layers. This segmentation creates multiple current paths and reduces the equivalent series inductance while maintaining compact dimensions.
2Reliability
If a three-terminal type MLCC is used to reduce ESL, then the equivalent series inductance is reduced, but the mounting area is increased
Solution Approach 1:
The patent embeds multiple internal electrodes (first, second, third internal electrodes) within the dielectric layers in a nested configuration, where each internal electrode is surrounded by dielectric material. The external electrodes are positioned at different locations on the same body, nesting the three-terminal functionality within a compact package without requiring additional mounting space.
3Reliability
If multiple MLCCs are connected in parallel to reduce impedance, then the impedance is reduced, but the mounting area is increased
Solution Approach 1:
The patent combines multiple capacitor functions into a single integrated component by stacking multiple internal electrodes (first, second, third internal electrodes) with dielectric layers alternately. This merging of multiple capacitor units into one component achieves the impedance reduction effect of parallel connection while occupying the space of only one component, eliminating the need for multiple separate MLCCs.
Data Source
AI summary
A capacitor component includes a body including a dielectric layer and first and second internal electrodes disposed to face each other in a first direction while having the dielectric layer interposed therebetween, and including first and second surfaces, third and fourth surfaces, and fifth and sixth surfaces; first and second margin portions disposed on the fifth and sixth surfaces, respectively; first and second connection parts disposed on the third and fourth surfaces, respectively, and including metal layers connected to the first internal electrode and ceramic layers disposed on the metal layers; a connection electrode penetrating through the body and connected to the second internal electrode; a first external electrode disposed on one surface of the first connection part; a second external electrode disposed on one surface of the second connection part in the first direction; and a third external electrode disposed on the body and connected to the connection electrode.