T491B225M025AT7280

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):	4.5 Ohm
Type:	Molded
Voltage - Rated:	25V
Tolerance:	±20%
Capacitance:	2.2µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Tantalum Capacitors

Tantalum capacitors are an important component of the semiconductor industry. As the name implies, they are made of an oxide-coated, electrolytic-based tantalum material. They are used to store and discharge an electrical charge, and they come in a range of sizes and capacitances. One such capacitor is the T491B225M025AT7280 which is widely used in various electronic devices.

Applications

Tantalum capacitors are extremely popular due to their high capacitance, low cost, and small size. This makes them an ideal choice for applications that require a large capacitance without taking up too much space. As such, they are widely used in fields such as power supplies, portable gadgets, and circuit boards. They are also used in high-frequency resonant circuits and electro-acoustic transducers. In addition to these applications, tantalum capacitors are also used in automotive electronics, medical devices, military systems, and many other types of equipment. For example, they can be found in airbag control systems, antilock brakes, and traction control systems.

Working Principle

Tantalum capacitors are constructed in a similar manner to other electrolytic capacitors, but they use a different type of electrolyte. In this case, the electrolyte is a solid electrolyte composed of highly conductive tin oxide. A metal layer, usually made of tantalum, is electroplated onto the tin oxide layer. This metal layer acts as the dielectric and provides the capacitance. The capacitance of the capacitor is determined by the surface area of the metal layer and the type of material used as the dielectric. The larger the surface area, the more charge the capacitor can store. This is why tantalum capacitors are used for applications that require high capacitance without consuming too much space. When a voltage is applied across the capacitor, the metal layer acts as an insulator and the charges are held tightly in the dielectric. This process is known as dielectric absorption and it is responsible for the high capacitance of the tantalum capacitor. As the voltage is increased, the capacitance decreases as the charges are discharged.

Conclusion

T491B225M025AT7280 is one of the most popular tantalum capacitors used in the semiconductor industry. It is ideal for applications that require a large capacitance without taking up too much space. The capacitor works on the principle of dielectric absorption, where the metal layer acts as an insulator and the charges are held tightly in the dielectric. This makes the capacitor well-suited for use in power supplies, portable gadgets, circuit boards, and many other types of equipment.

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