T491A474K020AT

Lifetime @ Temp.:	2000 Hrs @ 125°C
Failure Rate:	--
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	A
Lead Spacing:	--
Height - Seated (Max):	0.071" (1.80mm)
Size / Dimension:	0.126" L x 0.063" W (3.20mm x 1.60mm)
Package / Case:	1206 (3216 Metric)
Mounting Type:	Surface Mount
Series:	T491
Operating Temperature:	-55°C ~ 125°C
ESR (Equivalent Series Resistance):	14 Ohm
Type:	Molded
Voltage - Rated:	20V
Tolerance:	±10%
Capacitance:	0.47µF
Part Status:	Active
Packaging:	Tape & Reel (TR)

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T491A474K020AT Tantalum Capacitors Application Field and Working Principle

Tantalum capacitors are widely used in electronic circuit design for their powerful capacitive properties and wide range of temperature ranges. The T491A474K020AT is a radial leaded surface mount type tantalum capacitor manufactured by the Kemet Corporation. This device is designed for use in applications such as filter circuits, timing circuits, light dimmer circuits and other safety critical power designs. The T491A474K020AT is available in a number of specific characteristics such as ESR (Equivalent Series Resistance), Z5U temperature characteristics, CV (Coefficient of Variation) and LLE (Leakage Level E) levels. The ESR of the T491A474K020AT is expressed as a ratio of the equivalent series resistance to the capacitance of the device and is used to measure the equivalent capacitance of the device. The Z5U temperature characteristics of the capacitor indicates the minimum and maximum temperature range, or temperature coefficient, at which the device will operate correctly. The CV, or Coefficient of Variation, is used to measure the variation in the performance of the device over temperature. The LLE (Leakage Level E) levels indicates the maximum amount of current leakage of the device which must be taken into consideration when sizing a circuit containing the capacitor. The T491A474K020AT is constructed using series of tantalum metal layers that are separated by an insulating material. The combination of these metal layers form an anode electrode which is connected to an anode terminal and a cathode electrode which is connected to the cathode terminal. When a voltage is applied across the device, the charge stored on the anode electrode is attracted to the cathode electrode producing a capacitive effect that can store a charge. The amount of charge stored on the device is determined by the capacitance present in the device which is a function of the geometry of the metal layers and the insulating material. The T491A474K020AT is also subject to a variety of other material specifications and safety requirements. The capacitance of the device must be greater than or equal to the specified value on the device and must also comply with the temperature characteristics specified. The capacitance and the temperature characteristics of the device can also be affected by external stresses such as voltage, current, or temperature changes. Additionally, the device must also meet safety requirements from the National Electronics Manufacturers Association (NEMA) to ensure it complies with safety standards. The T491A474K020AT is commonly used in filter circuits, timer circuits, light dimmer circuits and other safety critical power designs due to its high capacitance, low ESR, wide temperature variations and low leakage current. This device is also particularly suited for high frequency applications due to its low ESR and wide temperature range. Additionally, the device is very robust and reliable which makes it a great choice for safety critical applications. In conclusion, the T491A474K020AT Tantalum Capacitor offers a great range of features and capabilities for a variety of electronic circuits applications. It is constructed from high performing components and is designed to meet safety standards from NEMA. The wide temperature range, low ESR, wide capacitance and low leakage current provide an ideal combination for filter circuits, timer circuits, light dimmer circuits, and other safety critical power designs.

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