Series:	CD7
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance:	1200pF
Tolerance:	±2%
Voltage - Rated:	100V
Dielectric Material:	Mica
Operating Temperature:	-55°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	Radial
Lead Spacing:	0.173" (4.40mm)
Features:	General Purpose
Size / Dimension:	0.319" L x 0.154" W (8.10mm x 3.90mm)
Height - Seated (Max):	0.299" (7.60mm)

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Mica and PTFE Capacitors

Mica and PTFE capacitors, (CD7FA122GO3) are essential components in many military and aerospace systems. They are capable of handling high temperatures and extremely high voltages. They are commonly used as part of the frequency control or electronic filtering circuits found in military aircraft, missile guidance systems, and some navigation and communication systems.Mica and PTFE capacitors are composed of mica and polytetrafluoroethylene (PTFE). The construction of a mica and PTFE capacitor begins with a series of mica sheets, each charged with a predetermined voltage and impregnated with dielectric fluid to fill the interlaminar spaces and provide a more uniform electrical field. This creates an orderly stacking of dielectric layers. The mica layers are then alternately sandwiched between two layers of PTFE, one on top and one on the bottom, which forms the base of the capacitor. Mica and PTFE capacitors have several advantages over traditional self-healing or paper capacitors. First, their dielectric properties are highly reliable and frequently follow a predictable trend. Unlike other types of capacitors, their capacitance change nearly linearly with voltage and temperature. Additionally, they exhibit very low leakage currents and excellent insulation resistance.The most common application of a mica and PTFE capacitor is power filtering. This application requires a high degree of stability, uniformity, and reliability due to the constant voltage and current that flow through the capacitors over long periods of time. Mica and PTFE capacitors are also used in timing and control circuits and in radio and radar systems due to their predictable capacitance change with voltage and temperature. One of the unique features of mica and PTFE capacitors is their ability to handle high temperatures. Mica and PTFE capacitors are highly resistant to thermal distortion or melting, and can stand temperatures up to 300 degrees Celsius. This makes them especially suitable for use in electronic components that must function in extraordinarily high temperatures, such as those found in aircraft and missile guidance systems. The working principle of mica and PTFE capacitors is similar to that of standard paper or ceramic capacitors. However, mica and PTFE capacitors employ a unique combination of electrical and heat resistance properties to provide superior performance in extreme temperatures. When an AC voltage is applied to the capacitor, the opposing dielectric layers will cause the voltage to be divided between them, resulting in an alternating electric field. This field will cause a polarization effect that will partially reduce the electric field, allowing for a steady current and power transmission. Mica and PTFE capacitors are extremely reliable and efficient components for the military and aerospace industry. They are able to withstand recurrent exposure to extreme temperatures and voltage levels, and they are capable of delivering superior performance over standard capacitors. The predictability of their capacitance change with temperature and voltage makes them an ideal choice for filtering, timing, and control applications.

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