TACU475M004RTA

Tantalum Capacitors

Tantalum capacitors are small, solid, electrolytic capacitors with a dielectric of tantalum oxide. Due to their small size and higher capacitance, much better performance than ceramic capacitors, and lower cost, Tantalum capacitors are used in a variety of applications, including power supply filters and decoupling, audio coupling and decoupling, and impedance matching.

TACU475M004RTA Application Field and Working Principle

TACU475M004RTA (from TDK Corporation) is a solid tantalum capacitor with an anode material of MnO2, a cathode terminal of an anode film with a conductive polymer, and a solid electrolyte of Ta2O5. This type of capacitor is usually used in general purpose applications, such as automotive and consumer electronics. Because of its low ESR, this type of capacitor is often used as an alternative to tantalum bead capacitors to reduce switch-mode power supply ripple.

The working principle of the TACU475M004RTA is based on the formation of the MnO2 layer between the anode and cathode terminals. When a positive voltage is applied to the capacitor\'s anode and cathode terminals, the MnO2 layer acts as an ionic electrolyte, allowing for a reversible electrochemical reaction to occur. As current is passed through the capacitor, a charge builds up on the anode terminal, forming a positive layer of ions on the anode material, increasing the capacitance. This process is repeated while current is supplied to the capacitor, forming the equivalent of a flyback converter.

The MnO2 layer also provides additional protection against AC and DC surges, allowing the capacitor to operate in more extreme temperatures. In addition, the MnO2 layer reduces the formation of dendrites, which can cause electrical arcs and fail to provide the capacitor with its required capacitance.

The TACU475M004RTA capacitors are designed to be used in a wide range of applications, such as automotive, consumer electronics, and medical. As a general-purpose capacitor, it offers good linearity and low ESR, making it suitable for use in switch-mode power supplies, DC power distribution loads, audio filtering and pulse trimming, among others. The high temperature range makes it suitable for automotive applications, and it is also RoHS compliant.

Conclusion

The TACU475M004RTA is a Tantalum capacitor that is designed for general purpose applications. It features an anode material of MnO2, a cathode terminal of an anode film with a conductive polymer, and a solid electrolyte of Ta2O5 that provides high temperature resistance, long cycle life, and a low ESR profile. With its wide range of applications, high temperature range, and RoHS compliance, the TACU475M004RTA has become a popular choice for many applications.