SMT Capacitors offer extended capacitance ratings

Already renowned as a leading manufacturer of high voltage capacitors, Syfer has further pushed the boundaries by applying its product development and production expertise to delivering higher capacitance values for its 2kV capacitor range. Starting with the smallest device in the range, the 1206 packaged part, with an X7R dielectric, now offers a capacitance range from 10pF to a remarkable 2.2nF, more than doubling the maximum capacitance value previously available. Similarly, the popular 2225 footprint device has seen a capacitance range increase from 180pF to 33nF, up from a maximum of 15nF previously.

The primary advantages to designers of this significant performance improvement are reduced footprint and/or higher capacitance. The breakthrough is the consequence of Syfer’s ongoing materials and process improvement activities. The company has developed and introduced a new process for the preparation of the ceramic used to manufacture the product. This has resulted in a doubling of the effective breakdown voltage, allowing for this dramatic increase in the capacitance range of devices in the 2kV range.

John Shreeve, Syfer Technical Director commented: “It is rare to achieve such a huge increase in performance from process changes. In fact, in this case the effect was considerably more favourable than anticipated”.

Syfer’s 2kV range is available with the class Il stable X7R dielectric. These devices are generally used for by-passing (decoupling), coupling, filtering, frequency discrimination, DC blocking and voltage transient suppression, typically delivering greater volumetric efficiency than Class l units, while maintaining stability within defined limits.

The extensive 2kV series of X7R surface mount capacitors ranges from 1206 to 8060 parts, with capacitance ranges from 1pF to 150nF. All X7R types are also available with the Syfer FlexiCap TM flexible termination. This proprietary flexible epoxy polymer termination material is applied to the device under the usual nickel barrier finish. FlexiCap will accommodate a greater degree of board bending than conventional capacitors. The benefit to the user is to facilitate a wider process window giving a greater safety margin and substantially reducing the most common cause of failures in multilayer capacitors – mechanical cracking.