Lifetime @ Temp.:	2000 Hrs @ 125°C
Failure Rate:	--
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	C
Lead Spacing:	--
Height - Seated (Max):	0.110" (2.80mm)
Size / Dimension:	0.236" L x 0.126" W (6.00mm x 3.20mm)
Package / Case:	2312 (6032 Metric)
Mounting Type:	Surface Mount
Series:	T491
Operating Temperature:	-55°C ~ 125°C
ESR (Equivalent Series Resistance):	2 Ohm
Type:	Molded
Voltage - Rated:	35V
Tolerance:	±10%
Capacitance:	4.7µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Tantalum Capacitors

Introduction

Tantalum capacitors, commonly referred to as tantalums, are an electrochemical type of capacitor that offers very high capacitance ratings in a relatively small package. They are widely used in a variety of electronic applications, ranging from automotive, military, and aviation electronics to consumer products, telecommunications, and medical applications. In this article, we will discuss the application field and working principle of the T491C475K035AT2478 tantalum capacitor.

Application field

Specifically, the T491C475K035AT2478 tantalum capacitor is designed for high frequency and high ripple current applications such as switching power supplies, LCD display power supplies and mobile telephone power conversion circuits. This capacitor is also suitable for applications where low E.S.R. (Equivalent Series Resistance) is required, such as higher D.C. voltage, audio frequency, and pulse circuits.

Working Principle

Tantalum capacitors are composed of a tantalum metal powder core that is electrodeposited with manganese dioxide onto a metal substrate. The metal substrate is then wrapped in a protective separator layer of another metal, forming the anode and cathode of the capacitor. The capacitor is then filled with an electrolyte solution and sealed in a protective case.When the capacitor is charged, the positively charged manganese dioxide is attracted to the negatively charged tantalum metal powder core and forms a molecular trust layer. As the capacitor continues to charge, the trust layer becomes increasingly thicker and provides a barrier against further positive ions. The barrier has a specific capacitance which increases with the increasing trust layer thickness.When the capacitor needs to discharge, the trust layer conducts current back to the negative plate, allowing for a constant voltage drop across the capacitor. As a result, the capacitor can store energy for longer periods of time than other types of capacitors.

Conclusion

The T491C475K035AT2478 tantalum capacitor is designed for applications requiring high capacitance, high ripple current, and low E.S.R. The capacitor has a molecular trust layer which can store energy for longer periods of time compared to other types of capacitors, making it an ideal choice for a variety of electronic applications.

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