ALF20C391EC350

Ratings:	--
Package / Case:	Radial, Can - Snap-In - 4 Lead
Mounting Type:	Through Hole, Press-Fit
Surface Mount Land Size:	--
Height - Seated (Max):	1.457" (37.00mm)
Size / Dimension:	1.575" Dia (40.00mm)
Lead Spacing:	0.886" (22.50mm)
Impedance:	236 mOhms
Ripple Current @ High Frequency:	4.5A @ 10kHz
Ripple Current @ Low Frequency:	2.33A @ 100Hz
Applications:	General Purpose
Series:	ALF20
Polarization:	Polar
Operating Temperature:	-40°C ~ 85°C
Lifetime @ Temp.:	2000 Hrs @ 85°C
ESR (Equivalent Series Resistance):	361 mOhm @ 100Hz
Voltage - Rated:	350V
Tolerance:	±20%
Capacitance:	390µF
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are a type of capacitor that makes use of an aluminum oxide film as a dielectric, with the help of an electrolyte solution between an anode and cathode (positive and negative) plate. This combination is what makes aluminum electrolytic capacitors one of the most efficient and versatile types of capacitors to have in a variety of applications.The ALF20C391EC350 is an aluminum electrolytic capacitor that is designed and specifically created to be an application-specific capacitor. Its specifications are optimized to meet a range of performance needs in various industrial applications. This capacitor type is designed to be a low impedance, low ESR (Equivalent Series Resistance), and extended life capacitor. This capacitor is typically used in applications where low ESR and extended lifetime are needed, such as in switching power supplies, power converters, and motor drives. Because of its low ESR and low impedance, it is also suitable for use in medical, telecom, and computing applications. It is also commonly used to provide filtering and decoupling in high-reliability systems.The ALF20C391EC350 consists of a solid conductive aluminum anode and a dielectric created by an electrolyte, which acts as an insulator and helps to reduce the possibility of short-circuiting and leakage. The anode is first formed into a cylinder with an extended end that is then etched into a mesh structure. This etching increases the surface area of the anode resulting in capacitance value increases of up to 30%. The cathode of the ALF20C391EC350 is made up of layers of a special type of aluminum oxide that is developed in the laboratory. This formulation is also known as an “electro-formed” oxide film, which is designed to provide high charge density in the capacitor. The combination of the anode and cathode create a capacitor with a very low ESR, a high ripple current, long life expectancy, and excellent temperature characteristics.The working principle of the ALF20C391EC350 will be discussed in detail in the following sections. When power is supplied to the capacitor, a voltage will be applied across the anode and the cathode, which are separated by the electrolyte solution. The applied voltage causes charges to build up across the anode and the cathode, creating a potential difference across both electrodes. This potential, once established, encourages electrons to flow from the anode to the cathode.The electrolyte solution acts as the resistive element in the capacitor. It\'s electrolytic nature and high resistance to the current prevents high current flow through the capacitor. This resistance means that the current flow in the capacitor will be kept to a minimum and also will help to limit the amount of heat generated in the capacitor, keeping its body stable and durable. When the capacitor is working, the electrons continue to be supplied at the anode and then travel through the electrolyte solution to the cathode. Finally, the electrons collect at the cathode and the potential difference gradually decreases, eventually resulting in a practically constant voltage across the capacitor. This phenomenon is called “charge balance” which is a key factor for long life and reliable operation of the ALF20C391EC350. In conclusion, the ALF20C391EC350 aluminum electrolytic capacitor is a popular application-specific capacitor developed to meet specific performance requirements for a variety of industrial applications. The several layers of an anode and cathode create the capacitor that is designed to provide a low ESR, low impedance, and extended life. By using the electrolyte solution as a resistive element, the capacitor will also be able to sustain low heat generation and help prevent short-circuiting and leakage. The capacitor is specifically designed to be an optimal solution for industrial applications that require extended lifetime, low ESR, and low impedance.

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