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EMI & EMC Solutions > EMI Filters  
 

EMI Filters

  • We are the experts in electromagnetic interference.
  • Power, signal, tempest, or otherwise, we tackle all interference with disdain!
  • We offer:
    • Filter circuit design and analysis
    • Quick turn-around prototyping
    • Complete engineering support from inception to completion
    • Any chassis configuration imaginable
    • Filter packaging and layout
    • Qualification Testing
    • ESS Testing
    • Built in transient and HEMP/EMP protection
    • Build to print
    • Over 10,000 designs to date
    • Multiple termination interfaces including:
      • Threaded Terminals
      • Solder Terminals
      • Connectors (military, commercial, D-sub, IEC, & numerous others)
      • Wire Leads and Harnesses
      • Custom designed interface
What is an EMI Filter?

EMI filters are electronic devices that are designed to eliminate the effects of electromagnetic interference or “noise” in electrical and electronic systems. An EMI filter cannot eliminate the noise; however, it can suppress it, mitigating its impact. When installed, they operate as a passive system component, and because of the many types and variations in EMI, there is virtually no limit to the type of EMI filter that can be engineered. Some of the more common types include C, Single L, Single p, Single T, Double L, Double p, and Double T.

Like any filter, an EMI filter eliminates noise through resistance; by delivering higher resistance to high-frequency signals, it filters out the high-frequency noise. Typically, EMI filters do this through a combination of inductors and capacitors. Inductors are basically very small electromagnets, and hold electric current in a magnetic field. As the current passes through, voltage is reduced. The capacitors are designed to let alternating current (AC) pass, while hindering direct current (DC), which is where the lion’s share of EMI enters an electrical system. The capacitors used in an EMI filter are also known as “shunting capacitors”, as they shunt specific high-frequency signals away from the circuit.

When selecting an EMI filter, there are some device parameters that are essential to the selection process and include rated voltage, current, frequency, and insertion loss. These are the basic considerations; others that may affect the ultimate choice include voltage drop, DC resistance, leakage current, insulation resistance, dielectric withstanding voltage, and power dissipation.

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0-400 VDC EMI Filters

DC EMI Filters

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  • Voltage Rating : 0 - 400 VDC
  • Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
  • Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
  • DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
  • Insertion Loss : Per MIL-STD 220
  • Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
  • Terminal Strength : Per MIL-STD-202, Method 211
  • Operating Temperature : -55º C to +71º C
  • Storage Temperature : -55º C to +105º C
  • Threaded Terminals : 10-32UNF-2A
  • Threaded Inserts : 10-32UNF-2B
  • Bracket Mounting Holes : 0.203" Diameter
  • Chassis & Terminal Finish : Electro Tin-Lead
  • Chassis Material : CRS
120/208 VAC Three Phase with Filtered Neutral EMI Filters

AC Three Phase EMI Filters

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  • Voltage Rating : 120/208 VAC @ 50/60 Hz and 400 Hz
  • Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
  • Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
  • DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
  • Insertion Loss : Per MIL-STD 220
  • Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
  • Terminal Strength : Per MIL-STD-202, Method 211
  • Operating Temperature : -55º C to +71º C
  • Storage Temperature : -55º C to +105º C
  • Threaded Terminals : 10-32UNF-2A
  • Threaded Inserts : 10-32UNF-2B
  • Bracket Mounting Holes : 0.203" Diameter
  • Chassis & Terminal Finish : Electro Tin-Lead
  • Chassis Material : CRS
120/208 VAC Three Phase with Filtered Neutral EMI Filters

AC Three Phase with Filtered Neutral EMI Filters

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  • Voltage Rating : 120/208 VAC @ 50/60 Hz and 400 Hz
  • Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
  • Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
  • DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
  • Insertion Loss : Per MIL-STD 220
  • Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
  • Terminal Strength : Per MIL-STD-202, Method 211
  • Operating Temperature : -55º C to +71º C
  • Storage Temperature : -55º C to +105º C
  • Threaded Terminals : 10-32UNF-2A
  • Threaded Inserts : 10-32UNF-2B
  • Bracket Mounting Holes : 0.203" Diameter
  • Chassis & Terminal Finish : Electro Tin-Lead
  • Chassis Material : CRS
125/250 VAC Single Phase EMI Filters

AC Single Phase EMI Filters

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  • Voltage Rating : 125/250 VAC @ 50/60 Hz and 400 Hz
  • Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
  • Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
  • DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
  • Insertion Loss : Per MIL-STD 220
  • Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
  • Terminal Strength : Per MIL-STD-202, Method 211
  • Operating Temperature : -55º C to +71º C
  • Storage Temperature : -55º C to +105º C
  • Threaded Terminals : 10-32UNF-2A
  • Threaded Inserts : 10-32UNF-2B
  • Bracket Mounting Holes : 0.203" Diameter
  • Chassis & Terminal Finish : Electro Tin-Lead
  • Chassis Material : CRS
Circuit Card Assembly (CCA) Mounted Electromagnetic Interference (EMI) Filters

Circuit Card Assembly (CCA) Mounted Electromagnetic Interference (EMI) Filters

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If your system has MIL-STD-461 compliance requirements, many of the DC-DC converters on the market will not be compliant. The EMI filters listed below have been designed to meet this requirement. In addition, custom voltages/current ratings/size can be designed to meet your specific application.
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