T491D156K020ZTZ012

Lifetime @ Temp.:	2000 Hrs @ 125°C
Failure Rate:	--
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	D
Lead Spacing:	--
Height - Seated (Max):	0.122" (3.10mm)
Size / Dimension:	0.287" L x 0.169" W (7.30mm x 4.30mm)
Package / Case:	2917 (7343 Metric)
Mounting Type:	Surface Mount
Series:	T491
Operating Temperature:	-55°C ~ 125°C
ESR (Equivalent Series Resistance):	1 Ohm
Type:	Molded
Voltage - Rated:	20V
Tolerance:	±10%
Capacitance:	15µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Tantalum capacitors are one of the most useful components used in various applications. They are also known as tantalum electrolytic capacitors as they use a tantalum based electrolyte as the dielectric material instead of the typical ceramic dielectric used in typical capacitors. The T491D156K020ZTZ012 is a tantalum capacitor that comes in a standard 0805 (2032 metric) form factor. It is a type of surface-mount capacitor and features a voltage rating of 10 volts, a capacitance of 156μF, and a 10% tolerance.ApplicationsT491D156K020ZTZ012 tantalum capacitors are widely utilized in different applications, such as general-purpose power supply decoupling, filtering, and transient suppression. As they have a low ESR and very low leakage current, these capacitors are often used for voltage bypass. Furthermore, tantalum capacitors are used to improve and enhance system performance as they quickly dissipate transient energy, ensuring the supply voltage remains clean and stable in different applications.The T491D156K020ZTZ012 is tested up to 1000 V surge and has a life expectancy of up to 1,000,000 hours at 85°C. Its rugged construction, together with its small size, makes it suitable for all high-end applications such as the military, aerospace, and medical industries.Working PrincipleTantalum capacitors are polarized components, meaning that they have a positive and negative terminal. One plate is always made of tantalum metal, while the other is either a solid manganese dioxide layer, or a sintered manganese dioxide layer. A small amount of liquid organic electrolyte, typically an alkaline type of electrolyte, is placed between the two plates. When a DC voltage source is connected across the capacitor, current is created which causes the tantalum ions to migrate onto the tantalum plate and the manganese dioxide ions to migrate onto the manganese dioxide plate.The capacitance of a tantalum capacitor is highly dependent on the thickness of the dielectric layer of manganese dioxide, which is created as the ions migrate. This means that when the applied voltage is being changed, the capacitance is being changed as well. This behavior is known as voltage-dependent capacitance, or variable capacitance, and is seen in all types of capacitors, not just the tantalum capacitors.The most important feature of a tantalum capacitor is its ability to withstand high temperatures without losing its dielectric strength. Tantalum capacitors have a very high thermal and electrical stability and can hold their rated capacitance and working voltage over a wide temperature range making them suitable for high temperature applications.ConclusionT491D156K020ZTZ012 tantalum capacitors are highly reliable and feature a combination of robust performance and low leakage current. They are suitable for many applications, such as power supply decoupling, filtering, and transient suppression, as they have a low ESR and low leakage current. Furthermore, they feature a voltage-dependent capacitance and excellent thermal and electrical stability, and can be used in high temperature environments.

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