ELXS421VSN391MR40S

Polarization:	Polar
Package / Case:	Radial, Can - Snap-In
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	1.673" (42.50mm)
Size / Dimension:	1.181" Dia (30.00mm)
Lead Spacing:	0.394" (10.00mm)
Ripple Current @ High Frequency:	2.3738A @ 50kHz
Ripple Current @ Low Frequency:	1.66A @ 120Hz
Applications:	General Purpose
Ratings:	--
Series:	LXS
Operating Temperature:	-25°C ~ 105°C
Lifetime @ Temp.:	5000 Hrs @ 105°C
ESR (Equivalent Series Resistance):	--
Voltage - Rated:	420V
Tolerance:	±20%
Capacitance:	390µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Aluminum Electrolytic Capacitors – ELXS421VSN391MR40S Application Field and Working Principle

Aluminum electrolytic capacitors are a type of capacitor that uses an aluminum oxide film coated on an anode to act as the dielectric to store electrical energy via an electrolytic process. They are commonly used in consumer electronic products because of their cost effectiveness, low leakage current, and high capacitance-to-volume ratios. The ELXS421VSN391MR40S is an aluminum electrolytic capacitor series, featuring high capacitance (2.041 uF) and high ripple current (0.55 A). This makes it an ideal choice for applications in switched-mode power supplies, LED drivers, and other power supplies that require strong filtering of power rails.

Structure of an Aluminum Electrolytic Capacitor

The basic structure of an aluminum electrolytic capacitor consists of a bare aluminum foil sheet referred to as the anode, that is rolled into a tube then coated with an aluminum oxide layer and sealed in a can. This can is then filled with an electrolyte that acts as a conductor for the current between the anode and the cathode, which are separated by the dielectric.

How Does an Aluminum Electrolytic Capacitor Work?

An aluminum electrolytic capacitor works when the power source Polarity is applied. A small amount of electrical current passes through the electrolyte, allowing for the oxidation of the anode that occurs at the same time. This forms the dielectric layer in the form of an oxide film, that acts to store electrical energy. The higher the capacitance, the more electrical energy the capacitor can store.

Applications of the ELXS421VSN391MR40S

Due to its high capacitance and high ripple current, the ELXS421VSN391MR40S is a popular choice for applications in switched-mode power supplies, LED drivers, and other power supplies that require strong filtering of power rails. It is also well suited for a variety of other applications, such as high-frequency rectification, DC-DC converters, and switching mode systems.

Conclusion

The ELXS421VSN391MR40S aluminum electrolytic capacitor series is a cost-effective solution for applications that require a high-performance capacitance and high ripple current rating. Its structure and working principle make it a reliable and efficient capacitor in various consumer electronic applications.

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