RS PRO Mica Capacitor, Capacitance 390 pF, Voltage 500 V DC, Model No 495818 (Pack of 5)

RS PRO Mica Capacitor, Capacitance 390 pF, Voltage 500 V DC, Model No 495818 (Pack of 5) is a type of capacitor that uses mica as the dielectric material. Mica is a naturally occurring mineral with excellent electrical insulating properties, making it suitable for capacitor applications that require high stability, low losses, and precise capacitance values.

The construction of a mica capacitor typically involves sandwiching a thin mica sheet between two metal electrodes. The mica sheet acts as the dielectric, providing insulation between the electrodes while allowing the storage and release of electrical charge. The electrodes are usually made of metal foils or metalized coatings.

One of the key advantages of mica capacitors is their high stability. They exhibit low temperature coefficients, meaning their capacitance values remain relatively constant over a wide temperature range. This stability makes mica capacitors well-suited for applications that require accurate and reliable capacitance values, such as in timing circuits, frequency filters, and high-frequency applications.

Mica capacitors also offer low losses, which means they have a high Q-factor. The Q-factor is a measure of the energy stored and dissipated by a capacitor, and a high Q-factor indicates low energy losses. This characteristic makes mica capacitors suitable for applications that require high efficiency and minimal energy loss, such as in RF circuits and resonant circuits.

Another advantage of mica capacitors is their ability to handle high voltages. They have excellent voltage ratings and can withstand high voltage levels without breakdown or failure. This feature makes them suitable for use in power electronics, high-voltage power supplies, and other applications that require reliable voltage handling capabilities.

Mica capacitors are also known for their low dielectric absorption. Dielectric absorption is the phenomenon where a capacitor retains some charge after being discharged. Mica capacitors exhibit minimal dielectric absorption, which is desirable in applications that require quick charging and discharging cycles.

However, mica capacitors also have some limitations. They tend to be physically larger compared to other capacitor types, which can be a disadvantage in space-constrained applications. Additionally, mica capacitors can be more expensive compared to other capacitor types due to the cost of mica as a raw material.

In summary, mica capacitors are known for their high stability, low losses, and accurate capacitance values. They offer excellent temperature stability, low dielectric absorption, and high voltage ratings. While they may be physically larger and relatively more expensive, mica capacitors are preferred in applications that demand precise and reliable performance, particularly in high-frequency and high-voltage circuits.

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