EMI Filters For Medical Implantable Devices


Knowles Precision Devices (KPD) has released a range of EMI components under the Syfer brand, aiming designers in the medical implantable and space sectors as well as industrial, automotive, aerospace and telecom applications.

The new components help manufacturers of electronic equipment for hi-rel applications to meet stringent EMC and safety standards.

“The increasing use of surface mount filters over conventional panel mounted filters has simplified assembly methods, reduced production costs and enabled smaller volumetric efficiencies”, the company noted.


The Syfer E01 and E07 ranges of feedthrough MLCC C filters now have extended working voltages from 25 to 200V DC, and in certain cases up to 500V DC. These surface mount EMI filter three- terminal chip devices are designed to offer reduced inductance compared to conventional MLCCs when used in signal line filtering. The filtered signal passes through the chip’s internal electrodes with the ‘noise’ filtered to the grounded side contacts, resulting in reduced length noise transmission paths.

Available in C0G/NP0 & X7R dielectrics, in case sizes 0805 to 1812. Current ratings are 300mA to 3A with voltage ratings of 25 to 200V DC (500V DC in some case sizes).

The company’s Syfer E03 (X2Y) range in case sizes ranging from 0805 to 2220 for can be used to replace conventional array filters in medical implantable devices.

They feature both common and differential mode capacitors in a single MLCC chip.

C0G and X7R dielectric versions are also available as options. X7R dielectric versions are available with KPD’s FlexiCap termination which is recommended for new designs.

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The Syfer SBSP range of surface mount pi-filters ensures EMI filtering performance For both signal and power lines. The filters are suitable for telecomms, power supplies and industrial electronic equipment.

An operating temperature range of -55 to +125 degrees C ensures they are also suitable for mil/aerospace applications. The use of X7R and C0G ceramic dielectrics sees capacitance values from 22pF to 150nF with a 1A current rating. They have working voltages up to 100V DC.

FlexiCap termination is used throughout the range and all versions are available with either tin or tin/lead finishes.

Further information: http://www.knowlescapacitors.com



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