T491B476K004AT4280

Lifetime @ Temp.:	2000 Hrs @ 125°C
Failure Rate:	--
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	B
Lead Spacing:	--
Height - Seated (Max):	0.083" (2.10mm)
Size / Dimension:	0.138" L x 0.110" W (3.50mm x 2.80mm)
Package / Case:	1411 (3528 Metric)
Mounting Type:	Surface Mount
Series:	T491
Operating Temperature:	-55°C ~ 125°C
ESR (Equivalent Series Resistance):	2 Ohm
Type:	Molded
Voltage - Rated:	4V
Tolerance:	±10%
Capacitance:	47µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Tantalum Capacitors

Tantalum capacitors, also known as tantalum electrolytic capacitors, are polarized capacitors that contain a tantalum oxide anode and an electrically conductive liquid cathode. They are widely used for applications requiring a wide range of capacitance values, from around 0.01µF up to thousands of farads, and in higher-voltage applications up to 75 V. Their exact construction and method of operation differ from conventional aluminum electrolytic capacitors.

T491B476K004AT4280 Application Field

The T491B476K004AT4280 is a low-profile, high-temperature, high-voltage tantalum electrolytic capacitor featuring an extended temperature range of -55C to +125C and a high pulse load capability due to its high thermal stability and low equivalent series resistance (ESR). It is designed to provide increased capacitance stability in higher voltage applications that require improved temperature.The T491B476K004AT4280 is designed for use in a wide variety of electronic applications, including medical devices, telecom, alternative energy equipment, automotive, military and aerospace. It is suitable for use in digital circuits, power factor correction, level shifting, amplifier circuits, filters and decoupling applications.

T491B476K004AT4280 Working Principle

In tantalum capacitors, the anode metal (typically tantalum) is partially converted electrochemically into a layer of tantalum oxide that acts as a dielectric layer. The dielectric layer is then anodically linked to another metal layer (the cathode) which is formed of an electrically conductive liquid, or electrolyte. Under normal operation, an electric current flows through the anode-cathode junction, with charges of the same polarity attracting one another. In this manner, a positive charge is built up on the anode, and a negative charge on the cathode, which results in the capacitor\'s electrical capacitance. The more the charges attracted and stored, the higher the capacitance of the capacitor. Therefore, T491B476K004AT4280 tantalum capacitors exhibit excellent volumetric efficiency, providing higher capacitance values in a much smaller physical package size than other types of capacitors. Also, due to the high temperature stability and low ESR, the T491B476K004AT4280 capacitors are able to offer higher reliability in high pulse load applications where other capacitors fail. All these benefits make the T491B476K004AT4280 the ideal choice for applications requiring high voltage, high frequency, and high performance in high temperature environments.

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