T540D476K020AT8505

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T540D476K020AT8505 is a type of tantalum - polymer capacitor. It is mainly characterized by its high volumetric efficiency and low ESR performance, which makes it an ideal choice for many applications. So what are the application fields and working principle of T540D476K020AT8505? Let’s have a look at this in the following.

Application Field

T540D476K020AT8505 is mainly used in high frequency/high temperature/high voltage applications, as well as in general purpose circuits. Popular applications include：

• Computer memory systems: It is widely used in data storage, dynamic random access memory (DRAM) and Random-access memory (RAM) production.
• High frequency applications: High frequency DC-DC converters for sub-4GHz communication systems.
• Telecommunications: Communication equipment such as mobile phones, electronic meters, etc.
• Medical applications: It is used in network control system and portable equipment of medical electric appliance.

Working Principle

T540D476K020AT8505 utilizes a special combination of electric double layer capacitors (EDLCs) and solid tantalum capacitors connected in series. The utilization of this technology allows for a large capacitance in a small package, with a relatively low ESR. The EDLCs allow high-voltage operation, an extremely low leakage current, and high volumetric efficiency. The solid tantalum capacitors make it possible to reduce the ESR. Therefore, the combination of the two offers a low ESR and high volumetric efficiency operation in high frequency/high temperature/high voltage applications.

T540D476K020AT8505 utilizes two external connections, one to ground and one to the output signal. The EDLCs are connected between the ground and output signals using a series of electrodes. The signal charges the EDLCs until the voltage across them reaches its rated maximum value. It then automatically prevents over-charging and the voltage across them stays at its maximum value until the input signal is zero. Once the signal is zero, the EDLCs automatically discharge the stored energy and get ready for the next cycle.

T540D476K020AT8505 also uses a so-called “self-healing” feature which utilizes electrochemical migration and redistribution of metals to heal potential short-circuiting created by external faults. The unique construction of this device allows for a short-circuit recovery with no external heating.

In summary, T540D476K020AT8505 is a tantalum - polymer capacitor which is ideal for applications that require high volumetric efficiency and low ESR performance. It can be used in high frequency/high temperature/high voltage applications and general purpose circuits, and its “self-healing” feature is also beneficial. This makes it very popular in memory systems, high frequency circuits, and medical apparatuses.

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