Common-mode and Differential-mode EMI Filters

Reducing or eliminating electromagnetic interference is a must in electronics to ensure devices function well and are protected from damage caused by high-frequency noise and radiation. This is achieved using EMI filters, which are categorized into common- and differential-mode types and further into LC, RC, PI and T kinds based on configuration.

Widely available EMI suppression devices in China typically have a rated voltage of 115, 125 or 250VAC or 50 or 150VDC, rated current of 1 to 20A, frequency of 50/60Hz and operating temperature of -30 to 100 C. They conform to UL, cUL, CE, CSA, VDE, CQC and RoHS standards and are mostly for industrial automation, medical, communication, energy and military applications. Products based on custom specifications and for other applications can also be sourced.

To keep up with the miniaturization trend in electronics, Chinese manufacturers will continue to develop smaller and more lightweight EMI filters with enhanced noise suppression performance.

The main components used in the production of EMI filters, such as capacitors, varistors, choke coils, resistors and PCBs, are obtained from domestic and foreign companies. Their cost and supply are expected to stay generally stable in the coming months and keep the prices of EMI filters unchanged, according to suppliers interviewed by Global Sources.

EMI filter, 125/250VAC, 1 to 10A rating

Company: Dongguan Createn Electronics Co. Ltd

Dongguan Createn’s EMI filter, the FT-YA1803, has a rated voltage of 125/250VAC, rated current of 1 to 10A, operating frequency of 50/60Hz, hipot ratings of 1,450VDC line to line and 2,250VDC line to ground, and operating temperature of -25 to 85 C. It meets UL, CSA, VDE, CQC and CE standards.

MOQ: 500 units

Lead time: 15 days

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EMI filter, -25 to 85 C operating temperature

Company: Dongguan Createn Electronics Co. Ltd

The FT-YA1805 is an EMI filter from Dongguan Createn with 125/250VAC rated voltage, 1 to 10A rated current and 50/60Hz operating frequency. Its hipot ratings are 1,450VDC line to line and 2,250VDC line to ground. This unit, with an operating temperature of -25 to 85 C, meets UL, CSA, VDE, CQC and CE requirements.

MOQ: 500 units

Lead time: 15 days

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EMI filter, 50/150VDC, 10A rating

Company: Shaanxi Shinhom Enterprise Co. Ltd

Shaanxi Shinhom’s DW00X Series EMI filter has rated and withstand voltages of 50/150VDC and 125/375VDC, rated current of 10A, insulation resistance of 100Mohms and operating temperature of -30 to 85 C.

MOQ: Negotiable

Lead time: 15 days

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EMI filter, -40 to 120 C operating temperature

Company: Shaanxi Shinhom Enterprise Co. Ltd

This RoHS-compliant EMI filter from Shaanxi Shinhom, the DLF75L05, has an input voltage of 0 to 75V, output current of 5A, insertion loss of 43dB and operating temperature of -40 to 120 C. It measures 25.4x25.4x10.2mm.

MOQ: Negotiable

Lead time: 15 days

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EMI filter, 0 to 10MH rated inductance

Company: Shenzhen Yamaxi Electronics Co. Ltd

The Filter-5708 from Shenzhen Yamaxi has a rated current of 0 to 3A and rated inductance of 0 to 10MH. Its sealed housing is water-resistant.

MOQ: 100 units

Lead time: 14 days

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EMI filter, 0 to 3A rated current

Company: Shenzhen Yamaxi Electronics Co. Ltd

From Shenzhen Yamaxi, the Filter-0493 for EMI suppression has a water-resistant sealed housing. It has 0 to 3A rated current and 0 to 10MH rated inductance.

MOQ: 100 units

Lead time: 14 days

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