INDUSTRY COMPONENT

Filter Capacitor

Filter capacitor for smoothing rectified AC to DC in LED drivers

Component Specifications

Definition
A filter capacitor is an electronic component used in power supply circuits to reduce ripple voltage by storing and releasing electrical charge, ensuring stable DC output in high-efficiency LED driver modules. It smooths the pulsating DC from rectifiers, minimizing electromagnetic interference (EMI) and protecting sensitive LED components from voltage fluctuations.
Working Principle
Operates by charging during voltage peaks and discharging during troughs, acting as a low-pass filter that attenuates high-frequency AC components while allowing DC to pass through. In LED drivers, it maintains consistent voltage levels across the load, preventing flicker and ensuring optimal LED performance and longevity.
Materials
Typically constructed with aluminum electrolytic or ceramic dielectric materials; aluminum electrolytic capacitors offer high capacitance values (e.g., 100-1000µF) for bulk filtering, while ceramic capacitors provide low ESR for high-frequency noise suppression. Electrolyte: non-solid or solid polymer; electrodes: aluminum foil; casing: aluminum can with insulating sleeve.
Technical Parameters
ParameterTypical rangeNotes & selection driver
ESRLow ESR (<0.1Ω)
Lifetime2000 to 10000 hours at rated temperature
Tolerance±20%
Capacitance100µF to 1000µF
Voltage Rating16V to 450V DC
Temperature Range-40°C to +105°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
ISO 9001, IEC 60384, AEC-Q200

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Overheating from high ripple current
  • Electrolyte leakage causing circuit damage
  • Reduced lifespan in high-temperature environments
FMEA Triads
Trigger: High operating temperature exceeding rated limits
Failure: Capacitance degradation or open circuit
Mitigation: Use capacitors with higher temperature ratings (e.g., 105°C), improve thermal management with heatsinks or ventilation
Trigger: Voltage spikes from power surges
Failure: Dielectric breakdown leading to short circuit
Mitigation: Implement overvoltage protection circuits, select capacitors with higher voltage ratings (e.g., 1.5x operating voltage)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Capacitance tolerance within ±20% as per IEC 60384 standards
Test Method
Testing includes capacitance measurement (LCR meter), ESR analysis, leakage current test, and temperature cycling per AEC-Q200 for automotive-grade applications

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
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Filter Capacitor

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

ZHIYUE GROUP CO. LTD
Zhejiang, CN
Founded 19916800 square meters
ISO9001 CCC CE TSE
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

Why are filter capacitors important in LED driver modules?

They smooth rectified AC to stable DC, preventing LED flicker, reducing heat generation, and extending LED lifespan by minimizing voltage fluctuations.

What are common failure modes of filter capacitors in LED drivers?

Electrolyte drying, increased ESR, capacitance loss, or short circuits due to overvoltage, high temperature, or poor quality, leading to driver malfunction or LED damage.

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.

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