Knowles, Brand SYFERPlanar Capacitor Arrays

Syfer Technology Limited has been manufacturing and supplying Planar Capacitor Arrays since 1990, and is the world's leading supplier. The multilayer ceramic Planar Capacitor Array is an application specific component designed for use in multi-line EMI/RFI filter circuits, typically found in filtered connectors. Planar Capacitor Array technology affords the user weight and volumetric efficiency as well as performance and reliability advantages compared to other capacitor technologies. Syfer's leading position has been achieved through utilisation of the advantages inherent in our "Wet-Stack" process. A stress-free component is produced with mechanical precision, enabling a filter assembly to withstand the most rigorous of electrical specifications.

The quality and reliability of Syfer's Planar Capacitor Arrays has been recognised by the approval of NASA for their use in the International Space Station (ISS).



The Planar Capacitor Array is a unitary block of ceramic containing capacitors or a combination of capacitors, feedthru's and ground lines. Our current capability extends from a simple 2 hole unit to a complex 155-way device. Individual line connection is made to each capacitor through a terminated hole, whilst the ground connection is made at the device perimeter. Very low impedances are encountered as signals are presented with multi-directional paths to ground.

Working with major customers in the EMC field has enabled Syfer to develop a comprehensive range of planforms.
These include the following:

? Circular (MIL-C-38999 and similar)
? ARINC 404 and 600
? "D" SUB (Rectangular and Trapezoidal)
? High Density "D" SUB
? Micro-D (MIL - C - 83513)

Special custom shapes are also available, please contact us with your custom requirements. Component thicknesses are produced from a minimum of 1.40mm (0.055") to 3.18mm (0.125").

The holes within the Planar Capacitor Array are required to perform differing electrical functions. This could embrace the following:

? Multiple capacitance values (to a wide value)
? Hole to hole insertion loss specification
? Hole grounding to a specific maximum resistance
? Functionless holes (Feedthru's)

Typical capacitance value range for C0G are 47pF to 4nF and X7R are 250pF to 600nF.

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