Capacitor (Fixed): Voltage Rating 10 V to 1000 V DC

Component Specifications

Definition

A fixed capacitor is an electronic component with a constant capacitance value, constructed from two conductive plates separated by a dielectric material. In resonant circuits, it works with inductors to create specific resonant frequencies for applications like signal filtering, oscillation, and impedance matching. Unlike variable capacitors, its capacitance cannot be adjusted after manufacturing.

Working Principle

It operates by storing electrical charge between its plates when voltage is applied, creating an electric field across the dielectric. In a resonant circuit, it interacts with an inductor to form an LC circuit, where energy oscillates between the capacitor's electric field and the inductor's magnetic field at a resonant frequency determined by the capacitance and inductance values.

Materials

Common materials include aluminum or tantalum for electrodes, with dielectrics such as ceramic (e.g., Class 1 or Class 2), polyester film, polypropylene, or electrolytic materials (e.g., aluminum oxide). Leads are typically made of tin-plated copper.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±1% to ±20%
Capacitance	1 pF to 1000 μF
Voltage Rating	10 V to 1000 V DC
Dielectric Type	Ceramic, Film, Electrolytic
Temperature Coefficient	-55°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60384, MIL-PRF-39014

Parent Products

This component is used in the following industrial products

Resonant Circuit

An electronic circuit that naturally oscillates at a specific resonant frequency determined by its inductance and capacitance components.

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Engineering Analysis

Risks & Mitigation

Dielectric breakdown due to overvoltage
Capacitance drift with temperature changes
Leakage current leading to circuit inefficiency

FMEA Triads

Trigger: Overvoltage or voltage spikes
Failure: Dielectric breakdown causing short circuit
Mitigation: Use capacitors with voltage ratings above operating conditions and implement surge protection.

Trigger: High operating temperatures
Failure: Reduced capacitance or premature aging
Mitigation: Select capacitors with appropriate temperature ratings and ensure adequate cooling.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Capacitance tolerance typically ±5% to ±10% for industrial applications

Test Method

Testing per IEC 60384 standards for capacitance, voltage rating, and insulation resistance.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Capacitor (Fixed)

Manufacturer profiles associated with Capacitor (Fixed).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the role of a fixed capacitor in a resonant circuit?

It sets the resonant frequency by storing and releasing electrical energy in conjunction with an inductor, enabling precise frequency selection for filtering or oscillation.

How does material choice affect capacitor performance?

Dielectric materials determine properties like stability, temperature tolerance, and loss characteristics; for example, ceramic capacitors offer high stability, while electrolytic types provide high capacitance in small sizes.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Capacitor (Fixed)