291 Series, Mica and PTFE Capacitors

Mica and PTFE (Teflon®) capacitors are a type of capacitor that are specifically designed for applications requiring excellent parametric stability, low losses, and relatively high voltage ratings. These capacitors use mica or PTFE as their dielectric materials. One of the key advantages of mica and PTFE capacitors is their ability to maintain stable electrical properties over time and under varying conditions. They exhibit low losses, meaning they do not dissipate much energy in the form of heat. This makes them suitable for applications where efficiency and reliability are crucial. However, there are some drawbacks to consider. Mica and PTFE capacitors are generally more expensive compared to other types of capacitors due to the cost of the dielectric materials and their specialized manufacturing processes. Additionally, the range of available capacitance values for mica and PTFE capacitors is typically limited to a few tens of nanofarads or less. These capacitors find application in various fields such as aerospace, telecommunications, medical devices, and high-end audio systems. They are commonly used in circuits that require stable and precise capacitance values, high voltage tolerance, and low losses. In summary, mica and PTFE capacitors are specialized capacitors that offer excellent parametric stability, low losses, and high voltage ratings. They are well-suited for applications that prioritize reliability, efficiency, and precision. However, they tend to have higher costs and limited capacitance value options. They are widely used in industries where stable and high-performance capacitors are required.