Vicor Input Filter Solutions

Advanced EMI filtering solutions for power systems. Our M-FIAM and QPI series provide superior EMI performance while maintaining compact form factors and high reliability in demanding applications.

Input Filter Technologies Overview

In today's complex power systems, electromagnetic interference (EMI) poses significant challenges to system performance and regulatory compliance. Vicor's input filter solutions provide superior EMI suppression while maintaining high efficiency and compact form factors.

Our filter technologies address both common-mode and differential-mode noise across a wide frequency spectrum, ensuring your power systems meet stringent EMI regulations while maintaining high power density and efficiency.

Filter Product Families

M-FIAM™ Filters

Filter in Array Module - Highly integrated EMI filters with exceptional common-mode and differential-mode noise suppression.

Key Features:

  • Integrated array configuration for space-constrained applications
  • High-performance common-mode and differential-mode filtering
  • Optimized for high-frequency switching power supplies
  • Compact footprint with superior EMI performance
  • Low DC resistance to minimize voltage drop

Target Applications:

  • Data center power supplies
  • Telecom rectifiers
  • Industrial power systems
  • Medical equipment

QPI™ Filters

Quad Pack Isolated - Advanced EMI suppression in a compact, isolated package for isolated power systems.

Key Features:

  • Galvanic isolation between input and output
  • Four-channel configuration for multiple rails
  • Superior EMI suppression for isolated power systems
  • Compact packaging for space-constrained applications
  • Enhanced safety with isolation barrier

Target Applications:

  • Isolated DC-DC converters
  • Medical power supplies
  • Safety-critical systems
  • Avionic power systems

Standard EMI Filters

Traditional EMI filter solutions for common applications with various package options.

Key Features:

  • Multiple package options (through-hole, SMD)
  • Wide range of current ratings
  • Compliance with international standards
  • Cost-effective solutions
  • Easy integration

Target Applications:

  • General purpose power supplies
  • Consumer electronics
  • Commercial equipment
  • Basic industrial systems

Custom Filter Solutions

Tailored EMI filtering solutions for specific application requirements with custom frequency response.

Key Features:

  • Application-specific tuning
  • Custom frequency response
  • Optimized for your specific noise spectrum
  • Collaborative design process
  • Prototype to production support

Target Applications:

  • Proprietary power architectures
  • Unique frequency requirements
  • Specialized military/aerospace
  • Research applications

Understanding EMI in Power Systems

Common-Mode vs. Differential-Mode Noise

Common-Mode (CM) Noise: Appears equally on both power lines with respect to earth ground. Generated by parasitic capacitances in transformers and semiconductor switching.

Differential-Mode (DM) Noise: Appears between the power lines. Generated by the switching action of power converters and conducted through the power path.

Effective EMI filtering requires addressing both CM and DM noise components.

Frequency Considerations

EMI requirements vary by frequency range:

  • 9kHz - 150kHz: Conducted emissions (mostly differential mode)
  • 150kHz - 30MHz: Both common and differential mode emissions
  • 30MHz - 300MHz: Radiated emissions (often caused by common mode currents)

Vicor filters are designed to provide attenuation across these critical frequency ranges.

Typical Specifications by Series

Series Type Current Rating CM Attenuation DM Attenuation Package Applications
M-FIAM Integrated Array 10A-40A 80dB @ 500kHz 70dB @ 150kHz Array Module High-density applications
QPI Isolated Quad 5A-20A per channel 85dB @ 2MHz 75dB @ 500kHz Quad Package Isolated systems
Standard EMI Discrete Filter 1A-30A 70dB @ 300kHz 60dB @ 100kHz Various General applications

Target Applications

Data Center Power

48V power distribution systems require EMI filtering to maintain signal integrity and comply with data center regulations.

Telecommunications

Base station power supplies and 5G infrastructure require filtering to prevent interference with sensitive RF circuits.

Industrial Systems

Factory automation and process control systems require filtering for reliable operation in noisy environments.

Medical Equipment

Patient-connected devices must meet stringent EMI requirements for safety and reliable operation.

Aerospace & Defense

Mission-critical systems require filtering that operates reliably in harsh environments.

Automotive

Electric and hybrid vehicle systems require EMI filtering to prevent interference with vehicle electronics.

Design Resources

EMI Application Notes

Detailed guidance on EMI design practices and filter selection for specific applications.

Filter Selection Guide

Step-by-step guide to selecting the right filter for your specific EMI requirements.

Custom Design Support

Work with our FAE team to design a custom filter solution for your unique requirements.

Find the Right EMI Solution for Your Application

Our FAE team specializes in EMI filter selection and design. Contact us to discuss your specific EMI challenges and requirements.

Contact Filter Experts Access Selection Guides