T551B687K008AT4251

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Tantalum - Polymer Capacitors are a type of capacitor that is composed of a porous Tantalum anode, a dielectric and a conductive polymer electrolyte. The T551B687K008AT4251 is a type of tantalum capacitor that is widely used in a variety of electronics, including mobile phones, computers, LCD and plasma TVs, automotive, medical and industrial electronics. This article will discuss the application field and working principle of the T551B687K008AT4251.

Application Field

The T591B687K008AT4251 is designed for applications where high capacitance, low ESR and high energy density are required. It is an ideal solution for board-level energy storage and filtering in portable, low voltage, and high frequency applications. It is often used in RF and high-speed digital applications, where its small form-factor and relatively low ESR/ESL make it an appropriate choice. It is also widely used in low-power PWM applications, due to its high ripple current, low losses, and low ESR/ESL characteristics. Its high thermal stability makes it suitable for harsh operating environments such as those found in military, aerospace, and medical applications.

Working Principle

The T591B687K008AT4251 works on the principle of electrostatic capacitance. This involves a dielectric material, such as tantalum nitride, sandwiched between two electrodes. When a voltage is applied, the electric field that is generated causes the electrons within the dielectric material to redistribute through a mechanism known as inductive polarization. This higher polarization allows for an increase in the electric field strength, which results in higher capacitance. Through this process, the T591B687K008AT4251 is able to store electrical energy across a wide range of frequencies, making it ideal for high frequency applications.

These capacitors also feature a positive temperature coefficient (PTC) that helps protect the device from significant over-voltage or current transients. This sensed voltage bias allows the device to autonomously adjust its capacitance by varying the dielectric constant to maintain a constant amount of stored energy as well as providing short-term over-voltage protection. This also helps to reduce power losses and allows the capacitor to perform more efficiently in higher power applications.

The capacitance of the T591B687K008AT4251 can also be maximized by using larger surface area electrodes, reducing the gap between the anode and the dielectric, and by using a conductive polymer as the electrolyte. A conductive polymer electrolyte provides a higher capacitance because of the higher mobility of charges contained within it. Overall, the combination of these properties makes the T591B687K008AT4251 a very robust and capable capacitor.

In conclusion, the T591B687K008AT4251 is a popular capacitance choice for a variety of applications due to its small form factor, low ESR/ESL, and high energy density. It works on the principle of electrostatic capacitance, utilizing a dielectric, an anode, and a conductive polymer electrolyte to store energy. Its high capacitance, high energy density, and positive temperature coefficient make it a suitable choice for RF and high-speed digital applications.

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