MC18FD331G-F

Mica and PTFE Capacitors

Mica and PTFE capacitors are a range of reliable, high-quality capacitors that are common in a number of applications. They are designed to provide high stability and low equivalent series resistance (ESR), making them an ideal choice for wideband and general-purpose applications.

The MC18FD331G-F is a popular mica and PTFE capacitor comprised of sputtered dielectric layers applied to an etched foil conductor. This design allows for superior performance with very low ESR and very low leakage current. This makes them ideal for applications that require high accuracy and stable operation over a wide temperature range, such as automotive electronics and industrial control.

Application Field

Mica and PTFE capacitors are typically used to store energy or filter signals in automotive electronics, industrial control systems, and various types of electronic equipment. The MC18FD331G-F is particularly well-suited for filtering signals such as radio-frequency (RF) signals in automotive and audio systems, as well as for bypassing high-voltage switching supplies, making them a highly versatile choice for many application fields.

Working Principle

The working principle of a mica and PTFE capacitor is quite simple. When a voltage is applied to the capacitor, electrons are transferred between the two layers of mica and PTFE insulation layers to form a space charge. This generates an electric field between the layers and a current is created. This current is proportional to the applied voltage and allows the capacitor to store energy.

The MC18FD331G-F capacitor is constructed with a very thin layer of mica (<0.2μm) that allows for high capacitance and low leakage currents. The outer layers of metallized PTFE also provide a very low ESR, allowing for high stability and operation in wide temperature ranges.

In a nutshell, mica and PTFE capacitors feature excellent performance over a wide temperature range and offer high stability and low equivalent series resistance. The MC18FD331G-F capacitor is especially well-suited for filtering RF signals, bypassing high voltage switching supplies, and providing excellent performance in automotive and audio systems.