Integrated ESD Discharge Layer in Multilayer Ceramic Capacitor
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Solution Overview
Problem
The miniaturization and integration of portable electronic devices make it challenging to provide effective electrostatic discharge (ESD) protection for internal components and prevent electric shocks, especially with the increasing use of metallic cases that can lead to electric shorts and external charge transfer.
Innovation Solution
A complex electronic component with a vertically stacked ESD protection structure, featuring a laminate with first and second external electrodes, discharge electrodes, an ESD discharge layer between them, and a cover layer, where the distance between the discharge electrodes is within 30 μm to 60 μm, ensuring excellent durability against static electricity and overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional ESD protection devices are provided, then ESD protection performance is improved, but device complexity increases and miniaturization becomes more difficult
Solution Approach 1:
The patent combines the ESD protection function with the existing capacitor structure by integrating an ESD discharge layer between the electrodes of the capacitor. This merging approach allows the same component to serve dual purposes: energy storage (capacitor function) and electrostatic discharge protection, thereby improving ESD protection performance without increasing device complexity or requiring additional separate protection devices.
Solution Approach 2:
The capacitor structure is designed to perform multiple functions simultaneously. The electrodes serve both as energy storage elements for the capacitor and as discharge paths for ESD protection. The dielectric layer and ESD discharge layer work together to provide both capacitance and ESD protection, making the component universal and eliminating the need for separate protection devices.
2Reliability
If the distance between discharge electrodes is reduced, then ESD protection effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the distance between the third and fourth electrodes to a specific range (30-60 μm) to achieve effective ESD protection while managing manufacturing precision requirements. By carefully selecting and controlling this parameter within a defined range, the invention balances ESD protection effectiveness with feasible manufacturing tolerances, avoiding excessively tight spacing that would be difficult to manufacture.
Solution Approach 2:
The ESD discharge layer is selectively positioned between the third and fourth electrodes in the region where ESD discharge occurs. This local placement of the discharge layer ensures that ESD protection is provided precisely where needed (between the discharge electrodes) without requiring uniform high-precision construction throughout the entire component, thereby reducing overall manufacturing precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced turn-on characteristics and high ESD durability, preventing damage from repeated exposure to static electricity and overvoltage, while maintaining positional freedom for PCB design due to the insulating cover layer.
Implementation Method 1
an ESD discharge layer disposed between the third electrode and the fourth electrode
Implementation Method 2
ESD discharge layer disposed between the third electrode and the fourth electrode, where a distance between the third electrode and the fourth electrode is within a range of 30 μm to 60 μm
Data Source
AI summary
A complex electronic component includes a body including a first external electrode and a second external electrode, disposed on an external surface thereof and a laminate; a plurality of first electrodes and a plurality of second electrodes, disposed in the laminate and electrically connected to the first external electrode and the second external electrode, respectively; a third electrode and a fourth electrode, disposed on the laminate to be spaced apart from each other and electrically connected to the first external electrode and the second external electrode, respectively; and an ESD discharge layer disposed between the third electrode and the fourth electrode. In addition, a distance between the third electrode and the fourth electrode is within a range of 30 μm to 60 μm.