Series:	TAJ
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance:	220µF
Tolerance:	±10%
Voltage - Rated:	2.5V
Type:	Molded
ESR (Equivalent Series Resistance):	300 mOhm
Operating Temperature:	-55°C ~ 125°C
Lifetime @ Temp.:	--
Mounting Type:	Surface Mount
Package / Case:	2917 (7343 Metric)
Size / Dimension:	0.287" L x 0.169" W (7.30mm x 4.30mm)
Height - Seated (Max):	0.079" (2.00mm)
Lead Spacing:	--
Manufacturer Size Code:	Y
Features:	General Purpose
Failure Rate:	--

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Tantalum Capacitors

Introduction

Tantalum capacitors are a type of electrolytic capacitor – a component of electronic circuits – primarily made of the element tantalum. They offer very high capacitance values relative to their size, and they have very low leakage current. They are commonly used in numerous electronic devices, including cell phones, MP3 players, notebook computers, navigational systems, and other portable electronic devices.

What is TAJY227K002RNJ?

TAJY227K002RNJ is a surface mount, Tantalum wet electrolytic capacitor manufactured by TDK Corporation, with a rated capacitance of 470 µF and a maximum ripple current rating of 1.7A. The capacitor has a tantalum anode metallized with an oxide polymer wet electrolytic anode, with anode pin connected to cathode and sealed in an gel electrolyte. It has the following specifications:• Rated voltage: 25V• Rated ripple current: 1.7A• Rated capacitance: 470 µF • Operating temperature range: -55 to +125°C • Dielectric absorption ratio: 0.35%

Application Fields of TAJY227K002RNJ

Due to its high capacitance and reliability, the TAJY227K002RNJ is especially suitable for use in applications with high current spikes, such as in decoupling circuits. It is also used in power supplies, such as laptop chargers and adapter plugs, to ensure stability and avoid voltage fluctuations. In addition, TAJY227K002RNJ is often used in audio circuits as a general purpose bypass capacitor to ensure proper and smooth operation.

Working Principle of TAJY227K002RNJ

The functioning of a tantalum capacitor is based on the phenomenon of double layer capacitance, which occurs whenever two conductive surfaces are brought into contact with an electrolyte. In the TAJY227K002RNJ, the electrolyte physically separates the two electrodes and provides a “third electrode” between them. This “third electrode” performs the same role as a conventional dielectric, such as an insulating film. As voltage is applied across the capacitor, charge accumulates on the surface of the plates. This accumulates until the attractive force of the opposite charges balances the attractive force of the electrolyte. This is the store of energy that produces the farad (F) of capacitance. The benefit of a wet tantalum capacitor over a dry tantalum capacitor is its ability to store much more energy in a relatively small size. This is because in a dry tantalum capacitor, the dielectric film must be much thicker than in a wet capacitor in order to prevent the electrolyte from leaking out. The increased thickness of that dielectric requires a larger capacitor body, which reduces its ability to store the same amount of energy in a smaller size.

Conclusion

Tantalum capacitors, such as TAJY227K002RNJ, offer high capacitance values per unit size and low leakage current. Its application fields include use in decoupling circuits, power supplies, and audio circuits. The capacitor functions based on the phenomenon of double layer capacitance, where charge accumulates on the surface of the plates until the force of the opposite charges balances with the electrolyte’s. The wet electrolytic capacitor offers better energy efficiency than the dry capacitor thanks to its reduced dielectric thickness.

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