LLS2G391MELC

Polarization:	Polar
Package / Case:	Radial, Can - Snap-In
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	1.378" (35.00mm)
Size / Dimension:	1.378" Dia (35.00mm)
Lead Spacing:	0.394" (10.00mm)
Ripple Current @ High Frequency:	3.2604A @ 50kHz
Ripple Current @ Low Frequency:	2.28A @ 120Hz
Applications:	General Purpose
Ratings:	--
Series:	LLS
Operating Temperature:	-25°C ~ 85°C
Lifetime @ Temp.:	3000 Hrs @ 85°C
ESR (Equivalent Series Resistance):	--
Voltage - Rated:	400V
Tolerance:	±20%
Capacitance:	390µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Aluminum Electrolytic CapacitorsAluminum electrolytic capacitors are electrochemical capacitors with solid conductive aluminum oxide (Al2O3) as the dielectric medium, and the active ingredients are aluminum foils with oxidized surface. Its structure is composed of a negative aluminum (or aluminum alloy) foil, which is etched into a large number of parallel strips, as the pole piece, and two pieces of pure aluminum foil as the end-surface. An insulation paper soaked with an electrolyte is used as the separator. After squashed them together, it becomes the simple aluminum electrolytic capacitors.ApplicationsAluminum electrolytic capacitors can be used in a wide variety of applications, from rectifier smoothing to power output filters, energy storage, high frequency bypass capacitors and charge pumps. The most common application of the aluminum electrolytic capacitors is to provide a high capacitance power supply filter for switch mode SFDP (switched-mode power supply). In this application, one or more pairs of capacitors may be used in the power supply circuit to filter the ripple voltage of the rectifier to ensure a stable DC output from the supply.The LLS2G391MELC is a capacitor of one of the aluminum electrolytic capacitors series. It is a high voltage, high capacitance capacitor suitable for a wide range of applications such as power supply filtering, high frequency switchers, and motor control. Due to it\'s high capacitance, the LLS2G391MELC is particularly suitable for applications that require high capacitance values in a relatively small package size.Working PrinciplesThe working principle of aluminum electrolyte capacitors is very similar to that of conventional capacitors. The key difference is that such capacitors make use of an oxide film on the surface of the electrodes to attain a very high capacitance value.The aluminum foil, which consists of a highly conductive anodic layer on the surface, becomes ionized when exposed to an electrolyte. This ionization forms a thin layer of conductive oxide on the electrode surface, creating a double electric layer. This layer increases the plate area, which subsequently enhances the capacitance of the device. The thicker the aluminum oxide layer is, the higher the capacitance of the aluminum electrolyte capacitor.Due to oxidation, these capacitors show a gradual decrease in the capacitance over time. That\'s why they are rated with a series of time/temperature characteristics. The various ratings are temperature at the rated DC voltage (Ta) and the maximum temperature derating (Td), as well as endurance ratings which specify the temperature rise over rated voltage.ConclusionAluminum electrolytic capacitors have a broad range of applications and can be used for power supply filtering, high frequency switchers, and motor control for a variety of purposes. The LLS2G391MELC is a high voltage, high capacitance capacitor suitable for different applications. It is capable of providing a high capacitance value in a small package size. The working principle of this capacitor is based on the creation of a thin oxide layer on the surface of the electrode which enhances the capacitance of the device. In order to guarantee its long-term stability, the LLS2G391MELC must be rated with a set of time/temperature characteristics, such as the temperature at the rated DC voltage and the maximum temperature derating.

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