420BXW100MEFC14.5X45

Polarization:	Polar
Package / Case:	Radial, Can
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	1.850" (47.00mm)
Size / Dimension:	0.571" Dia (14.50mm)
Lead Spacing:	0.295" (7.50mm)
Ripple Current @ High Frequency:	1.778A @ 100kHz
Ripple Current @ Low Frequency:	790mA @ 120Hz
Applications:	General Purpose
Ratings:	--
Series:	BXW
Operating Temperature:	-40°C ~ 105°C
Lifetime @ Temp.:	10000 Hrs @ 105°C
ESR (Equivalent Series Resistance):	--
Voltage - Rated:	420V
Tolerance:	±20%
Capacitance:	100µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are widely utilized in a variety of electronic devices and are highly sought after due to their ability to provide high capacitance and low ESR values at a relatively affordable cost. This article will discuss the application field and working principle of the specific type of capacitor represented by its part number, 420BXW100MEFC14.5X45.

Application Field

Aluminum electrolytic capacitors, such as the 420BXW100MEFC14.5X45, have several uses, depending on the required circuit performance. A few of the most common applications are:

AC Filtering/Smoothing:

Aluminum electrolytic capacitors are often used in AC filtering or smoothing circuits due to their high capacitance and low ESR values. These capacitors can provide a low impedance path for undesired AC frequencies, thereby helping to reduce the ripple in a power supply circuit.

Decoupling:

The high capacitance values of aluminum electrolytic capacitors also make them ideal for decoupling circuits. These capacitors can help reduce the amount of AC or DC voltage noise that is present on power lines by providing an alternate low impedance path for these high frequency signals.

DC Blocking/Coupling:

Aluminum electrolytic capacitors are often used for DC blocking or coupling applications. They can provide a low impedance path for AC signals, while providing a high impedance path for any unwanted DC signals.

Working Principle

Aluminum electrolytic capacitors are constructed in a manner which allows for their high capacitance values. The internal structure of these capacitors is composed of a series of sandwiched layers. The most significant layer is the anode, which is made of aluminum foil and is coated with an anodic oxide layer, providing the high dielectric constant which is required for the capacitance of the capacitor.The dielectric layer is then sandwiched between two thin layers of aluminum foil. The inside layer is the cathode, and the outside layer is referred to as the cathodizing foil. This layer helps keep the electrical field even and consistent throughout the entire capacitor.The anodicoxide layer is formed when an electrical current is passed through an electrolyte, typically containing calcium hydroxide, ammonium nitrate, or other corrosion resistance salts. This reaction causes the aluminum oxide layer to form on the of the anode and to “breakdown” the surrounding molecule lattice, thus creating a capacitance value.The capacitance value of a given aluminum electrolytic capacitor is dependent upon the size and thickness of the anode, as well as the surface area of the anodic oxide coating. In addition, the capacitance value will also be affected by the amount of electrolyte present and the amount of charge previously passed through the capacitor.

Conclusion

Aluminum electrolytic capacitors such as the 420BXW100MEFC14.5X45 are highly versatile components with wide-ranging applications. Their capabilities have revolutionized the design of circuits, providing solutions which would otherwise have not been feasible. These capacitors have a unique construction which provides for a high capacitance to size ratio, making them an ideal solution for a variety of applications. This article has discussed the application fields and working principle of aluminum electrolytic capacitors, which provides a good basis for understanding the technology.

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