Knowles Precision Devices Discoidal Capacitors

Discoidal capacitors are at the heart of many EMI filters. More robust and reliable than tubular capacitors, they offer higher capacitance options, with values up to several microfarads. In addition to standard configurations, we are able to meet customers’ specific drawings in terms of electrical performance and mechanical design. Discoidal multilayer ceramic capacitors are of a configuration suitable for direct mounting into filters, onto bulkheads and hybrid circuits. Due to their geometry, they have excellent RF performance characteristics as well as very high self-resonant frequencies. They are offered with a choice of C0G/NP0 or X7R ceramic, or in MOV (metal oxide varistor) material for voltage protection applications. Varistor planar arrays and varistor discoidal Varistor planar arrays and varistor discoidal provide a dual function. The use of metal oxide based ceramic (MOV) provides the voltage protection, with bi-directional clamping, while the inherent capacitance, due to the multilayer construction, ensures effective low-pass EMI filtering up to at least 1GHz.