T494X686M025AT Capacitors

Operating Temperature:	-55°C ~ 125°C
Failure Rate:	--
Features:	General Purpose
Manufacturer Size Code:	X
Lead Spacing:	--
Height - Seated (Max):	0.169" (4.30mm)
Size / Dimension:	0.287" L x 0.169" W (7.30mm x 4.30mm)
Package / Case:	2917 (7343 Metric)
Mounting Type:	Surface Mount
Lifetime @ Temp.:	2000 Hrs @ 125°C
Series:	T494
ESR (Equivalent Series Resistance):	300 mOhm
Type:	Molded
Voltage - Rated:	25V
Tolerance:	±20%
Capacitance:	68µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to Tantalum Capacitors

Tantalum capacitors are polarized capacitors with excellent electrical characteristics that are used in a range of electronic applications. These capacitors offer advantages such as high energy density, high frequency performance, low ESR, and a long shelf life. In addition, they are reliable, thanks to their hermetically sealed construction, making them an ideal choice for military and aerospace applications.

Construction of Tantalum Capacitors

A tantalum capacitor is constructed using two electrodes that are sandwiched between a solid tantalum oxide dielectric. The positive terminal is the solid oxide, and the negative terminal is the tantalum electrode. The characteristics of the capacitor depend on the type and amount of oxide used as the dielectric. An insulating sleeve that seals the capacitor from both the environment and internal shorts, makes the construction of the capacitor complete.

T494X686M025AT Specifications

T494X686M025AT is a surface mount tantalum capacitors that operates at a maximum temperature of 125 °C. It has a capacitance of 686 mF, an ESR of 0.025 ohms, and a voltage rating of 4 V. It has an industry standard 1206 package size and is ideal for applications that require superior ESR performance and low equivalent series resistance. The capacitance remains stable over a wide range of frequencies and temperature, due to its excellent frequency response characteristics.

T494X686M025AT Applications

T494X686M025AT is ideal for high speed, high frequency applications, such as pulsed voltage control, timing, and switching circuits. It is also suitable for high frequency power supply filtering, voltage smoothing, and blocking of direct current in DC-DC converters. Its hermetically sealed construction makes it an ideal choice for military and aerospace applications as well.

Working Principle of Tantalum Capacitors

The basic working principle of a tantalum capacitor is the same as any other capacitor. An electrostatic field is created between its plates when a voltage is applied. This field creates an opposite charge in the plates and creates a storage area for energy. If the applied voltage is removed, the energy stored in the capacitor is released back into the circuit. Thus, tantalum capacitors are used in electronic circuits for filtering, blocking, and energy storage.

Conclusion

Tantalum capacitors offer superior electrical characteristics and hermetically sealed construction. The T494X686M025AT is an example of a surface mount tantalum capacitor that is suitable for high speed, high frequency applications. It has excellent ESR and low equivalent series resistance, making it an ideal choice for applications that require superior performance.

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