F931A475MAA Capacitors

Introduction

Tantalum capacitors are polarized capacitors with low equivalent series resistance (ESR) and constant capacitance over a wide range of frequencies. They feature a high volumetric efficiency and a wide range of operating temperatures.

F931A475MAA Tantalum Capacitor

The F931A475MAA is a polarized tantalum capacitor intended for use in general purpose applications. It has a rated capacitance of 47uF and a rated voltage of 25V. Its capacitance can vary from 33uF to 62uF depending on the temperature. It has a low ESR and a long working life. It is also able to operate over a wide range of temperatures from -55C to +125C.

Application Field and Working Principle

The F931A475MAA is primarily used as a bypass or decoupling capacitor, where it provides a path for high frequency noise to bypass the signal path or decoupling of a voltage supply. It has a low ESR which enables it to be used in high frequency switching applications. It also has a low turn-on voltage which makes it suitable for use in applications where high ripple currents are present.

The principle of a tantalum capacitor is based on the electrochemical reaction. When a positive voltage is applied to the anode (positive) terminal a chemical reaction occurs which causes an oxide film to form on the negative (cathode) terminal. This oxide film acts as a dielectric medium and stores electric charge.

When the capacitor is discharged, there is no chemical reaction, so the oxide film gradually regenerates and the capacitor will refill itself. This regenerative action is why the capacitance does not change significantly with temperature.

Conclusion

The F931A475MAA is a polarized tantalum capacitor intended for general purpose applications. It has a low ESR and a wide operating temperature range from -55C to +125C. It is primarily used as a bypass or decoupling capacitor, where it provides a path for high frequency noise to bypass the signal path or decoupling of a voltage supply. The principle of a tantalum capacitor is based on the electrochemical reaction that stores electric charge.