INDUSTRY COMPONENT

Dielectric

Dielectric is an insulating material used in variable capacitors to store electrical energy by polarization without conducting current.

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Component Specifications

Definition
A dielectric is a non-conductive material that becomes polarized when subjected to an electric field, enabling energy storage in capacitors. In variable capacitors, it separates conductive plates and determines capacitance through its permittivity, thickness, and area. Dielectrics prevent electrical discharge while allowing electrostatic field formation, crucial for tuning and filtering in electronic circuits.
Working Principle
Dielectrics work by polarizing under an electric field, where molecular dipoles align to store electrostatic energy. In variable capacitors, adjusting the plate overlap area or dielectric insertion changes capacitance. The dielectric constant (relative permittivity) defines energy storage capacity, with higher values increasing capacitance. It insulates to prevent arcing while enabling reversible energy storage and release.
Materials
Common materials include ceramic (e.g., barium titanate), polymer films (e.g., polyester, polypropylene), mica, glass, or air. Specifications involve dielectric constant (εr), breakdown voltage (kV/mm), loss tangent (tan δ), temperature coefficient (ppm/°C), and moisture resistance.
Technical Parameters
  • Loss Tangent <0.01 for low-loss applications
  • Breakdown Voltage 10-100 kV/mm
  • Temperature Range -55°C to +125°C
  • Dielectric Constant 2-10,000 (material-dependent)
  • Thickness Tolerance ±5%
Standards
IEC 60384, ASTM D150, ISO 6721

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Dielectric.

dielectric material variable capacitor electrical insulation capacitance permittivity ceramic dielectric polymer film energy storage Dielectric Dielectric in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Variable Capacitor

A capacitor whose capacitance can be intentionally and repeatedly changed mechanically or electronically.

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Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown from overvoltage
  • Capacitance drift due to temperature/humidity
  • Increased losses at high frequencies
FMEA Triads
Trigger: Overvoltage exceeding breakdown strength
Failure: Dielectric breakdown, short circuit
Mitigation: Design with safety margins, use overvoltage protection circuits
Trigger: Material degradation from moisture absorption
Failure: Capacitance drift, increased leakage current
Mitigation: Use hermetic sealing, select moisture-resistant materials

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance tolerance ±5% to ±20%, depending on application
Test Method
IEC 60384 for capacitance, loss tangent, and insulation resistance measurements

Buyer Feedback

★★★★☆ 4.6 / 5.0 (34 reviews)

"As a professional in the Electrical Equipment Manufacturing sector, I confirm this Dielectric meets all ISO standards."

"Standard OEM quality for Electrical Equipment Manufacturing applications. The Dielectric arrived with full certification."

"Great transparency on the Dielectric components. Essential for our Electrical Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the role of dielectric in a variable capacitor?

The dielectric separates conductive plates, stores electrostatic energy via polarization, and allows capacitance adjustment by changing plate overlap or dielectric position, enabling tuning in circuits.

How does dielectric constant affect capacitor performance?

Higher dielectric constant increases capacitance for a given size, but may reduce stability or increase losses. Selection balances capacity, frequency response, and temperature stability.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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