MC12FA251G-TF

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Mica and Polytetrafluoroethylene(PTFE) capacitors are two of the main stay solid dielectrics used in applications that demand high temperature stability, Class I and II safety from electrical shock, flexible form and construction, and dielectric strength. One such capacitor is the MC12FA251G-TF, a mica-PTFE combination used in military, medical, and other applications where such characteristics are needed.

Mica is composed of alumina-silicate, an infusible compound added to insulating materials that provides high surface area. Its microcrystalline structure also results in superior flame resistance and up to 200x the long-term rated voltage of other dielectric materials, thus making it suitable for extremely high voltage applications. The main drawback is cost as dielectrics made from mica are more expensive than other materials.

PTFE, on the other hand, is more cost effective than mica and comes with plenty of other advantages:  It is corrosion resistant, unaltered by extreme temperatures, and has an attenuation of 1/2 of other dielectric materials. It is also lightweight, non-toxic, easy to clean, and resistant to a broad range of chemicals. Coupled with mica, PTFE offers good capacitance, stability, and longevity.

The MC12FA251G-TF capacitor is a mica-PTFE combination boasting features like high insulation value, high acoustic insulation, dielectric strength up to 5 kV, and a voltage range of 500VAC-4 kVac. This capacitor is ideal for use in extreme temperature applications such as military, medical, aerospace, and automotive applications. It is also used in surge protection, in high voltage power supplies and transformers, and for radio frequency equipment.

The MC12FA251G-TF capacitors are formed of a metalized PTFE film wrap sealed between symmetrical mica plates. The mica plates are pressed into flat plates with a reliable voltage rating, and the PTFE layer provides the spacer between the two elements which is necessary for the electrical insulation of the device. The metalized layer on the PTFE helps to create a low equivalent series resistance (ESR).

The working principle of the   MC12FA251G-TF capacitor is based on its construction. The dielectric layer between the plates forms an electrostatic field, allowing energy to be stored, released, or passed through the capacitor according to the circuit requirements. The capacitor has a large capacitance, which is indicated by its low ESR as it allows more energy to be stored in the same space than other capacitors due to its cheap structure. It is also very reliable and durable with a long service life even in extreme temperature conditions.

In conclusion, the MC12FA251G-TF capacitor is an ideal choice for high temperature applications due to its mica-PTFE combination. Its dielectric strength of up to 5 kV, low ESR, and voltage range of 500VAC-4 kVac make it one of the most reliable solid dielectrics on the market. It is used in a variety of applications including military, medical, aerospace, automotive, and other high voltage applications.

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