Ceramic Dielectric Composition for ESD Protection
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Solution Overview
Problem
Current ceramic dielectric compositions for automotive electronics face challenges in achieving both high mechanical strength and effective electrostatic discharge (ESD) protection, as ferroelectric materials can suffer from electrostrictive cracks under high electric fields and C0G-based paraelectric materials have low permittivity, leading to compromised ESD protection characteristics.
Innovation Solution
A ceramic dielectric composition using base material powders such as (Ca1-xSrx)(Zr1-yTiy)O3, Ca(Zr1-yTiy)O3, Sr(Zr1-yTiy)O3, and (Ca1-xSrx)TiO3, with specific ratios of x and y, which provide high room-temperature permittivity and excellent DC-bias characteristics, ensuring stable capacitance and enhanced ESD protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ferroelectric material is used to achieve high permittivity, then capacitance is improved, but electrostrictive cracks occur under high electric field causing deterioration of ESD protection characteristics
Solution Approach 1:
The patent changes the material composition parameters by using (Ca1-xSrx)(Zr1-yTiy)O3 with specifically controlled x and y values. This parameter optimization achieves high permittivity (≥50) while preventing electrostrictive cracks under high electric fields, thereby maintaining both capacitance and ESD protection characteristics
Solution Approach 2:
The patent employs composite ceramic material consisting of multiple elements (Ca, Sr, Zr, Ti) in specific proportions. This composite structure combines the high permittivity advantage of ferroelectric materials with the crack resistance needed for reliable ESD protection in automotive applications
2Reliability
If C0G-based paraelectric material is used to achieve low permittivity, then DC-bias characteristics are improved, but dielectric layer thickness must be reduced causing deterioration of withstand voltage characteristics
Solution Approach 1:
The patent optimizes the compositional parameters x and y in (Ca1-xSrx)(Zr1-yTiy)O3 to achieve a balance where DC-bias characteristics are maintained while permittivity is sufficiently high (≥50) to allow thicker dielectric layers with improved withstand voltage characteristics
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 composition achieves high capacitance, improved withstand voltage characteristics, and excellent ESD protection by maintaining permittivity unchanged under DC electric fields, allowing for thicker dielectric layers and enhanced reliability in automotive applications.
Implementation Method 1
having room-temperature permittivity of 50 or more and satisfying a dielectric constant (∈r) change rate of 10% or less when a DC electric field is changed from 0 V/μm to 5 V/μm
Data Source
AI summary
A ceramic dielectric composition contains a base material powder represented by one or more of (Ca1-xSrx) (Zr1-yTiy)O3, Ca(Zr1-yTiy)O3, Sr(Zr1-xTiy)O3, (Ca1-xSrx) ZrO3, and (Ca1-xSrx)TiO3, in which x and y satisfy 0≤x≤1.0 and 0.2≤y≤0.9, respectively. The ceramic dielectric composition have on may high room-temperature permittivity and excellent ESD protection characteristics and may secure withstand voltage characteristics while implementing relatively high capacitance.