T491B685K020AT

Operating Temperature:	-55°C ~ 125°C
Failure Rate:	--
Features:	General Purpose
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
Lifetime @ Temp.:	2000 Hrs @ 85°C
Series:	T491
ESR (Equivalent Series Resistance):	2.5 Ohm
Type:	Molded
Voltage - Rated:	20V
Tolerance:	±10%
Capacitance:	6.8µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Tantalum Capacitors

A tantalum capacitor is an electronic component made up of two metallic plates that are used to hold electric charge. These two main plates are usually separated from one another by a dielectric material, such as intermetallic layers, polymers, and ceramics, and the combination of these forms the basis of a reliable, high-performance capacitor. Typical device size ranges from 0.1μF to 10000μF, with capacitances up to 3000μF. Tantalum capacitors offer the advantages of small size, low ESR and ESL values, low parasitics, fast transistor switching, and an extremely high capacitance-to-volume ratio, making them ideal for high-speed digital applications.T491B685K020AT is a type of tantalum capacitor. It is an axial leaded device that is dipped in a black epoxy resin and consists of a tantalum anode, a MnO2 cathode, and an internal dielectric. Its dimensions are 9x14x4mm and its capacitance is 6.8μF. It has a voltage rating of 20V and a dissipation factor of 0.15.The main application for the T491B685K020AT is for filtering and decoupling applications in power supplies, I/O filters, and various electronic circuits. It provides excellent ripple absorption and also helps in maintaining the power supply voltage.The working principle of a tantalum capacitor is based on the charge distribution between two layers of material. When a voltage is applied across these two layers, charges of opposite polarity are created. These charges accumulate on the surface of the dielectric and create an electric field which is proportional to the applied voltage. This electric field causes the charges to attract one another through electrostatic attraction and pull them onto the metal plates. This is how a capacitor works and it is what allows it to store and discharge electrical energy.The T491B685K020AT is a reliable solution for high-power applications and its features make it ideal for use in consumer electronics, automotive, and embedded systems. It is available in standard and surge-resistant versions and its capacitance makes it an excellent choice for a variety of applications. It is suitable for frequencies up to 4GHz and has a temperature range of -40°C to +85°C.In conclusion, T491B685K020AT tantalum capacitors are highly efficient electronic components that are used for power supply filtration and decoupling applications. They offer excellent performance, low ESR and ESL values, low parasitics and a high capacitance-to-volume ratio. Furthermore, their high temperature range and surge-resistant capabilities make them suitable for numerous high-power applications.

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