Coil Component Electrode Layout for Compact PCB Clearance
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Solution Overview
Problem
Coil components face challenges in achieving a reduced size and low-profile design while maintaining high capacitance properties and preventing short circuits when integrated with adjacent components on a printed circuit board.
Innovation Solution
The design includes a coil component with a body having specific surface configurations, a wound coil, and external electrodes that are strategically positioned to minimize size and prevent short circuits, featuring a wound portion around a perpendicular winding axis and lead-out portions connected to L-shaped external electrodes, which are only on one side of the body, reducing the risk of short circuits and increasing effective volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil component size is reduced and profile is lowered, then the component can be installed in limited space, but the effective volume for capacitance is reduced
Solution Approach 1:
The external electrodes are configured to extend onto the side surface of the body in addition to the top surface, utilizing the vertical dimension and lateral surface area to increase effective electrode area without increasing the horizontal footprint of the component. This dimensional expansion allows more electrode material to be positioned within the same planar space, thereby increasing effective volume for capacitance while maintaining a compact component size.
2Volume of moving object
If external electrodes extend onto side surfaces, then effective volume is increased, but the risk of short circuit with adjacent components increases
Solution Approach 1:
The external electrodes are positioned asymmetrically on the side surfaces, specifically on opposite sides of the body rather than adjacent sides. This asymmetric configuration increases the lateral spacing between electrode edges on the side surfaces, reducing the risk of short circuits with adjacent components while still utilizing the side surface area to increase effective volume.
Solution Approach 2:
The electrodes are configured with different extension patterns on different surfaces of the body. The top surface electrodes extend fully, while the side surface electrodes are positioned strategically to maximize area while maintaining clearance. This localized optimization of electrode placement ensures high effective volume where space is available while maintaining reliability where clearance is critical.
3Reliability
If external electrodes are positioned on multiple surfaces, then capacitance properties are enhanced, but manufacturing complexity increases
Solution Approach 1:
The external electrodes are formed as continuous conductive structures that extend across multiple surfaces of the body without discrete joints or connections. This merging of electrode segments into unified continuous structures simplifies manufacturing by reducing the number of separate electrode formation steps and potential failure points, while still achieving enhanced capacitance through the increased effective area on multiple surfaces.
Data Source
AI summary
A coil component includes a body having a first surface and a second surface opposing each other, and a first side surface and a second side surface connecting the first surface to the second surface and opposing each other, a wound coil disposed in the body, and including a wound portion wound around a winding axis perpendicular to the first side surface of the body and first and second lead-out portions spaced apart from each other on the first side surface of the body, and first and second external electrodes spaced apart from each other on the first surface of the body, extending only onto the first side surface of the body and connected to the first and second lead-out portions, respectively.