ESD Protection Device with Ceramic Multilayer Substrate
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Solution Overview
Problem
Existing ESD protection devices face challenges in achieving desired ESD responsivity due to limited adjustability of discharge electrode areas and susceptibility to short circuits when exposed to high-voltage static electricity, leading to increased discharge starting voltage and potential melting of electrodes.
Innovation Solution
An ESD protection device with a ceramic multilayer substrate, featuring a mixture portion containing metal and semiconductor materials dispersed along the substrate's surface, connected by interlayer conductors with higher thermal conductivity, which facilitates efficient discharge and reduces temperature increases, thereby enhancing reliability and adjustability of ESD characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of opposing regions of discharge electrodes is increased to achieve desired ESD responsivity, then ESD protection performance is improved, but device size increases beyond product constraints
Solution Approach 1:
The patent transitions from a planar electrode arrangement to a three-dimensional stacked configuration by placing multiple discharge electrode pairs between laminated ceramic insulating layers. This vertical stacking enables increased total discharge electrode area without increasing the device's planar footprint, thereby achieving desired ESD responsivity while maintaining compact device dimensions.
Solution Approach 2:
The patent employs a composite structure combining ceramic insulating layers with conductive discharge electrodes and introduces a heat dissipation material layer with high thermal conductivity between the discharge electrodes. This composite approach enables both effective ESD discharge and heat management within a compact form factor, resolving the contradiction between performance and size.
2Reliability
If discharge electrodes are positioned close together to reduce discharge starting voltage, then ESD responsiveness is improved, but risk of short circuit increases
Solution Approach 1:
The patent employs a composite structure with ceramic insulating layers maintaining electrical isolation between discharge electrodes while a heat dissipation material layer provides thermal management. This composite approach enables close positioning of discharge electrodes for low discharge starting voltage while the insulating ceramic prevents short circuits and the heat dissipation material prevents thermal runaway.
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 allows for enhanced ESD responsivity and reliability by dissipating heat effectively, reducing the risk of short circuits and melting, and enabling precise adjustment of discharge characteristics, thus protecting electronic circuits from static electricity.
Implementation Method 1
When a voltage that produces an electrical breakdown is applied between the discharge electrodes 6, a discharge is generated between the discharge electrodes 6 in the hollow portion 5
Implementation Method 2
a discharge is generated between the discharge electrodes of the ESD protection device so that the static electricity can be made to flow to the ground
Implementation Method 3
heat generated at the time of the application of static electricity can be dissipated through the interlayer connecting conductor having a higher thermal conductivity than in-plane connecting conductors
Data Source
AI summary
An ESD protection device includes a ceramic multilayer substrate in which a plurality of ceramic insulating layers are laminated; a first connecting conductor extending through the main surfaces of the insulating layer; a mixture portion extending along a main surface of the insulating layer including the first connecting conductor and connected to the first connecting conductor, the mixture portion including a material dispersed therein, the material including at least one selected from a metal and a semiconductor, a metal and a ceramic, a semiconductor and a ceramic, a semiconductor, and a metal coated with an inorganic material; and a second connecting conductor that has electrical conductivity and is connected to the mixture portion and extends along the main surface of the insulating layer on which the mixture portion is provided.