Circuit & System Protection


EMI filters for Hi-Rel applications

13 June 2018 Circuit & System Protection

Manufacturers of electronic equipment for Hi-Rel applications often struggle to meet stringent EMC and safety standards. Knowles Precision Devices (KPD) has a range of EMI components, under the Syfer brand, that particularly appeal to designers in the medical implantable and space sectors as well as industrial, automotive, aerospace and telecom applications.

The increasing use of SMD filters over conventional panel mounted filters has simplified assembly methods, reduced production costs and enabled smaller volumetric efficiencies to be gained, giving a greater choice of options to the designer – particularly shorter lead times for development samples.

KPD continues to refine existing ranges, explore new ones and bring on board new materials, like lead-free dielectrics.

For example, the Syfer E01 and E07 ranges of feed-through MLCC ‘C’ filters now have extended working voltages from 25 V d.c. to 200 V d.c., and in certain case sizes up to 500 V d.c. These surface-mount, three-terminal EMI filter 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. They are available in C0G/NP0 and X7R dielectrics, in case sizes 0805 to 1812, and with current ratings of 300 mA to 3 A.

Particularly effective in replacing conventional array filters in medical implantable devices is the Syfer E03 (X2Y) range. Available in case sizes from 0805 to 2220, these are integrated passive devices featuring both common and differential mode capacitors in a single MLCC chip. C0G and X7R dielectric versions are both available options. X7R dielectric versions are available with KPDs proven FlexiCap termination which is strongly recommended for new designs.

Ideal for both signal and power lines, and ensuring impressive EMI filtering performance, is the Syfer SBSP range of surface mount pi-filters. With a size of only a 1206 chip they offer a beneficial combination of size and performance. Ideal for telecoms, power supplies and industrial electronic equipment, their operating temperature range of -55°C to 125°C ensures they are also suitable for military/aerospace applications. The use of X7R and C0G ceramic dielectrics sees capacitance values from 22 pF to 150 nF with a 1 A current rating, and they have working voltages up to 100 V d.c.

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

For more information contact Andrew Hutton, RF Design, +27 21 555 8400, andrew@rfdesign.co.za, www.rdesign.co.za



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