INDUSTRY COMPONENT

Output Filter Capacitor

Output filter capacitor for smoothing DC voltage in PSU voltage regulator modules.

Component Specifications

Definition
An output filter capacitor is an electronic component used in computer power supply units (PSUs) within voltage regulator modules (VRMs) to smooth and stabilize the direct current (DC) output voltage by filtering out high-frequency ripple and noise generated during AC-to-DC conversion and switching operations.
Working Principle
The capacitor stores electrical charge and releases it during voltage dips, acting as a low-pass filter that attenuates AC ripple components while allowing DC to pass through, thereby maintaining a stable output voltage for sensitive computer components.
Materials
Aluminum electrolytic or polymer capacitors with specifications including aluminum foil electrodes, electrolyte (liquid or solid polymer), and insulating oxide layer.
Technical Parameters
  • ESR 10-50 mΩ
  • Lifetime 2000-10000 hours at rated temperature
  • Capacitance 1000-4700 μF
  • Ripple Current 1-5 A RMS
  • Voltage Rating 6.3-16 V DC
  • Temperature Range -40°C to +105°C
Standards
IEC 60384, MIL-PRF-39018

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Output Filter Capacitor.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Overheating leading to reduced lifespan or failure
  • Voltage spikes causing dielectric breakdown
  • Incorrect capacitance or ESR values destabilizing output voltage
FMEA Triads
Trigger: High operating temperature or poor ventilation
Failure: Electrolyte evaporation and increased ESR
Mitigation: Use capacitors with high-temperature ratings and ensure adequate cooling in PSU design.
Trigger: Voltage transients from switching operations
Failure: Dielectric breakdown and short circuit
Mitigation: Implement overvoltage protection circuits and select capacitors with sufficient voltage derating.
Trigger: Aging and material degradation over time
Failure: Capacitance loss and reduced filtering efficiency
Mitigation: Regular maintenance, use of long-life capacitors, and monitoring ESR changes.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance tolerance typically ±20%, voltage tolerance as per rated specifications
Test Method
ESR measurement, capacitance testing, leakage current test, ripple current testing per IEC 60384 standards

Buyer Feedback

★★★★☆ 4.6 / 5.0 (25 reviews)

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Output Filter Capacitor meets all ISO standards."

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Output Filter Capacitor arrived with full certification."

"Great transparency on the Output Filter Capacitor components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

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Frequently Asked Questions

What is the main function of an output filter capacitor in a PSU?

It smooths the DC output voltage by filtering out high-frequency ripple and noise, ensuring stable power delivery to computer components.

How do I select the right output filter capacitor for a PSU?

Consider capacitance, voltage rating, ESR, ripple current rating, temperature range, and lifetime based on the PSU's output requirements and operating conditions.

What are common failure modes of output filter capacitors?

Electrolyte drying, increased ESR, capacitance loss, and short circuits due to overheating, voltage spikes, or aging.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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