Coil Component Insulating Layer for ESD Resistance
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Solution Overview
Problem
Existing coil components lack sufficient Electro-Static Discharge (ESD) resistance, particularly against high transient voltages like 25 kV, leading to insulation breakdown.
Innovation Solution
Incorporating an insulating layer between the external terminals and the element body, covering the entire region except for the connection area, prevents direct contact and thus suppresses short-circuiting, enhancing ESD resistance by interposing insulating layers 30A and 30B between the external terminals and the element body in the coil component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external terminals are directly connected to the element body, then electrical connection is simplified, but insulation breakdown occurs under high transient voltage
Solution Approach 1:
An insulating layer is introduced as an intermediary component between the external terminal and the element body. This insulating layer prevents direct contact and potential insulation breakdown while maintaining the electrical connection function through designated connection regions, thereby resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The insulating layer is applied selectively only in specific regions where needed for insulation, rather than covering the entire element body. The connection regions remain exposed to maintain electrical connectivity, achieving local differentiation that balances insulation requirements with electrical connection needs.
2Reliability
If insulating layer is added between external terminals and element body, then withstand voltage against transient voltage is improved, but manufacturing process becomes more complex
Solution Approach 1:
The insulating layer's properties (material composition, thickness, coverage area) are optimized to achieve the required insulation performance while minimizing manufacturing complexity. By carefully controlling these parameters, the solution maintains ease of manufacture while significantly improving insulation performance.
Data Source
AI summary
In a coil component includes an insulating layer interposed between an external terminal and an element body and formed in an entire region excluding a connection region in a formation region in which the external terminal is formed, even when a high transient voltage is applied between the pair of external terminals, insulation breakdown does not occur or hardly occurs because of the insulating layer.