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EMI Filter

EMI Filter

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What is an EMI Filter?
EMI filter (electromagnetic interference filter) also known as RFI filter, is an electronic passive device which is used in order to suppress conducted interference that is present on a signal or power line. Electromagnetic Interference (EMI) is unacceptable electromagnetic emissions, natural or man-made, which result in the degradation or malfunction of electronic equipment. EMI filters can be used to suppress interference that is generated by the device. Most EMI filters consist of components that suppress differential and common mode interference.
Types of EMI Filters
Coilmaster Electronics produces different kinds of EMI filters. Customer could find the EMI filter on our website categorized by dimension, IDC, impedance, DCR…etc. For instance, our C2L, C4S, RH, SMB series are most common type of EMI Filter in our produce line.
EMI Filters from Coilmaster Electronics
As mention above Coilmaster Electronics provide full range of EMI filter normally be used to design an RFI filter, EMI filter, Ethernet EMI filter, EMI air filter, EMI line filter, EMI suppression filter, EMI power filter, EMI noise filter, DC EMI filter, AC EMI filter or other circuit which may require an EMI filter. Customer could contact Coilmaster sales person to find the most suitable EMI filter which match your specific EMI filter application need. 
Coilmaster also could provide 100% alternative EMI filter against to other EMI filter manufacturer but with more competitive price and better lead time.
Applications for EMI Filters:
Normally EMI filter be used in the below applications:
  • Data lines
  • Digital audio / video and communications equipment
  • Computer pc boards.
  • USB hubs
  • CD and DVD ROMs
  • Printers
  • Hard disk drives
  • AC adapters
  • Musical instruments
Choosing the Right Power Inductor:
When you are looking for the right EMI filter, Coilmaster has professional RD group and sales person, please let us know your request on the EMI filter. We will provide the most suitable EMI filter in the shortest time. We trust you will be able to find the right EMI filter to design RFI filter, EMI filter,Ethernet EMI filter, EMI air filter, EMI line filter, EMI suppression filter, EMI power filter, EMI noise filter DC EMI filter, AC EMI filter
EMI Filter Free Of Charge Samples:
Coilmaster knows that it is very difficult to find the suitable EMI filter due to different size and characteristic. We provide free EMI filter samples to customer evaluation. Our sales person will advices the most suitable EMI filter to our customer, and customer also could choose the EMI filter by themselves. All the EMI filter is free of charge. (Below 30 pcs of EMI filter samples.)
SMD Type EMI Filter / EMI Suppression filter

Part number Description Size(mm)Max.
SMB403025 SMD ferrite EMI suppression filter 4.2x3.2x2.7
SMB784730 Ferrite SMD EMI filter 8.1x4.9x3.1
SMB853025 SMD ferrite beads 8.8x3.2x2.7
C4S S6H5x5 SMD wide band choke 5.0x5.0x4.6
C4S S6H5x8.5 SMD wide band choke 8.5x5.0x4.6
Click our part number could access to our specification
Axial Wide Band Choke / EMI Filter / EMI Suppression filter
Part number                                             Description                                              Size(mm)Max.
C4S R6Hx10 Axial wide band choke 6.3x10.4
RH 3.5x5 A/S Axial wideband choke 3.6x5.3
RH 3.5x6 A/S Axial wide band choke 3.6x6.3
RH 3.5x6 R/D Axial wideband choke 3.6x6.3
RH 3.5x9 A/S Axial wide band choke 3.6x9.3
S8H 11x11x10 Axial wideband choke 11.5x11.5x10.45
 
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