What is an EMI Filter?

An EMI filter, or electromagnetic interference filter, is an electronic passive device which is used in order to suppress conducted interference that is present on a signal or power line. EMI filters can be used to suppress interference that is generated by the device or by other equipment in order make a device more immune to electromagnetic interference signals present in the environment. Most EMI filters consist of components that suppress differential and common mode interference.

Types of EMI Filters

There are many different kinds of EMI filters.  we stock many of the most common types categorized by type, case size / dimension, impedance, maximum DC resistance, capacitance and rated current. The parametric filters on our website can help refine your search results depending on the required specifications.

The most common values for capacitance are 100 pF, 470 pF, 1 nF, 2.2 nF and 22 nF. We also carry EMI filters with capacitance up to 27 µF. Rated current can have a range between 1 mA and 100 A, with the most common EMI filters having a rated current of 200 mA, 300 mA, 2A or 6 A.

EMI Filters from 

Has a full EMI filter selection from several manufacturers that can be used to design an RFI EMI filter, DC EMI filter, AC EMI filter, 3 phase EMI filter, Ethernet EMI filter, EMI air filter, EMI line filter, EMI suppression filter, EMI power filter, EMI noise filter or any circuit that may require an EMI filter. Simply choose from the EMI filter technical attributes below and your search results will quickly be narrowed in order to match your specific EMI filter application needs.

If you have a preferred brand, we deal with several manufacturers such as Murata, Panasonic Industrial Devices, TDK, TE Connectivity or Tokin, among other manufacturers. You can easily refine your EMI filter product search results by clicking your preferred EMI filter brand below from our list of manufacturers.

Applications for EMI Filters:

Typical EMI filter applications include:

• Data lines

• Secondary power supply lines for digital audio / video and communications equipment

• Computer motherboards

• USB hubs

• Printers

• Hard disk drives

• CD and DVD ROMs

• AC adapters

• Electronic musical instruments

Choosing the Right EMI Filter:

When you are looking for the right EMI filters, with  parametric search, you can filter the results by various attributes: by Type (Capacitor Type, LC Combined Type, Line, …), Case Size/Dimension (0805, 1206, 2606,…) and Rated Current (from 1 mA to 100 A) to name a few. You will be able to find the right EMI filter to design an AC or DC EMI filter, RFI EMI filter, 3 phase EMI filter, EMI air filter, Ethernet EMI filter, EMI line filter, EMI suppression filter, EMI noise filter, EMI power filter or to design any circuit that may require an EMI filter.

EMI Filters in Production Ready Packaging or R&D Quantities

If the quantity of EMI filters that you require is less than a full reel, we offer customers many of our EMI filter products in tube, tray or individual quantities that will help you avoid unneeded surplus.

In addition,  offers clients a unique bonded inventory program that is designed to eliminate potential problems that could arise from an unpredictable supply of products containing raw metals and products with long or erratic lead times.