MALREKE00BA247HM0K

Series:	EKE
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance:	47µF
Tolerance:	±20%
Voltage - Rated:	50V
ESR (Equivalent Series Resistance):	2.822 Ohm @ 120Hz
Lifetime @ Temp.:	2000 Hrs @ 105°C
Operating Temperature:	-40°C ~ 105°C
Polarization:	Polar
Ratings:	--
Applications:	General Purpose
Ripple Current @ Low Frequency:	112.5mA @ 120Hz
Impedance:	430 mOhms
Lead Spacing:	0.098" (2.50mm)
Size / Dimension:	0.248" Dia (6.30mm)
Height - Seated (Max):	0.492" (12.50mm)
Surface Mount Land Size:	--
Mounting Type:	Through Hole
Package / Case:	Radial, Can

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are components that store electrical energy in a parallel plate configuration, by passing a current through two electrodes put in an electrolytic solution. They are capacitor variants that are widely used in applications such as filtering, power management, and decoupling. The MALREKE00BA247HM0K, a commonly used model, is a surface-mount aluminum electrolytic capacitor that supports high-temperature operation (up to 125°C).

Overview

Aluminum electrolytic capacitors have a very long history dating back to the 1920s, when they were initially used in radio communications. However, it wasn’t until the 1940s that major manufacturers began to produce them in commercial quantities. Today, aluminum electrolytic capacitors are still used in a variety of electronic devices and systems across industries. Due to their high capacitance and low price, they are extremely popular in power electronics in particular. Compared to other capacitor types, aluminum electrolytic capacitors offer superior capacitance and smaller packages. They are also generally cheaper, making them a popular choice for cost-conscious applications. However, they also lack the desired long-term stability of other types of capacitors, as their capacitance gradually decreases with aging.

Composition and Properties

An aluminum electrolytic capacitor consists of an anode, a cathode, and an electrolyte, with two thin aluminum foils used to separate them from each other. The anode foil is etched with an anode pattern in order to increase the surface area and achieve high capacitance values. The two foils are then rolled into a cylinder, and carbon film is sprayed between them in order to separate them electrically. A cathode electrode is also placed in the electrolytic solution, usually containing boric acid or potassium hydroxide. This solution acts as the electrolyte that allows current to flow between the two electrodes. The charge is stored in the anode and cathode by the passing of current, creating a static capacitance.

Application Field and Working Principle

Aluminum electrolytic capacitors are widely used in power electronics applications. One of the most common uses is in the switching power supply, which requires a high-ripple-current capacitor for filtering and decoupling high voltage AC in order to deliver steady DC output. The same capacitor type can also be used in power amplifiers, automatic-gain-control amplifiers, and other power devices. When the capacitor is subjected to an applied voltage, the electric field across the electrodes causes electrons to flow from the anode to the cathode, forming an electric double layer on the surface of the electrodes. This creates a static charge on the electrodes and stores electric energy in the form of electrostatic fields. As the field steadily decreases over time, the capacitor eventually reaches its leakage current, at which point the charge is completely drained and the capacitor has to be recharged in order for it to function again. Conclusion Aluminum electrolytic capacitors are an important part of many power electronics applications, as they offer superior capacitance in a small package at a relatively low cost. The MALREKE00BA247HM0K is a commonly used surface-mount aluminum electrolytic capacitor that supports high-temperature operation, and can be used in switching power supply, power amplifiers, and other power devices. When an electric field is applied across their electrodes, they store electric energy in the form of an electrostatic field, which gradually decreases over time.

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