381LQ271M315J022

Polarization:	Polar
Package / Case:	Radial, Can - Snap-In
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	1.260" (32.00mm)
Size / Dimension:	0.984" Dia (25.00mm)
Lead Spacing:	0.394" (10.00mm)
Ripple Current @ High Frequency:	1.54A @ 20kHz
Ripple Current @ Low Frequency:	1.1A @ 120Hz
Applications:	General Purpose
Ratings:	--
Series:	381LQ
Operating Temperature:	-40°C ~ 105°C
Lifetime @ Temp.:	2000 Hrs @ 105°C
ESR (Equivalent Series Resistance):	614 mOhm @ 120Hz
Voltage - Rated:	315V
Tolerance:	±20%
Capacitance:	270µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors, simply known as “electrolytics”, are one of the most widely used capacitors found in electrical and electronic circuits. The term of aluminum electrolytic capacitor was used to describe a type of wet electrolytic capacitor first introduced in the early 1900s using a roll-shaped aluminum sheet as electrolyte separator. In recent years, aluminum electrolytic capacitors have been manufactured for many other technologies, including foil and sintered electrodes, in which the performance characteristics greatly improved compared to the conventional wet electrolytics.The immediate advantage of aluminum electrolytic capacitors is their extremely high capacitance values – much larger than other capacitors for the same volume. This makes them an ideal choice for a wide range of applications, such as smoothing and filtering in DC to DC converters, power supplies, dc motors, and loudspeakers. They can also be used for high-frequency and high-current applications, such as high power switching, using oil-filled wire-wound aluminum electrolytics.The unique feature of aluminum electrolytic capacitors is their working principle. The internal construction of an aluminum electrolytic capacitor consists of an anode and a cathode, separated by an electrolyte. The anode is typically a thin aluminum foil stamped with a pattern of anode stripes. On top of this is a thin oxide layer that acts as the dielectric. The cathode is a liquid electrolyte which provides the ions for conduction. The two electrodes are then rolled and drained of the electrolyte, forming what is known as a ‘capacitor can’.The basic working principle of an aluminum electrolytic capacitor is a process called ‘Faraday’s Law of Induction’. This law states that when a current is applied to a conductor, a voltage is produced across the conductor. This voltage causes electrons to flow through the conductor forming an electric field between the electrodes, thus creating a capacitor. The electric field between the capacitor’s electrodes creates an electrostatic field between them, which is responsible for storing the energy.The most significant characteristic of an aluminum electrolytic capacitor is its long life. Due to its oxidation and chemical reactions, it has a much longer life than standard capacitors. However, this longevity is dependent on the operating temperature and the quality of the capacitor. There are certain ratings points associated with aluminum electrolytic capacitors, including rated voltage, rated temperature, and capacitance. Low voltage capacitors are rated at 12 V or less, with high-voltage capacitors being rated at over 50 V. High temperature applications may require the use of a capacitor rated at up to 85°C. The rated capacitance is expressed in microfarads (μF) and can range from 0.1 μF to more than 1000 μF.To sum up, aluminum electrolytic capacitors are suitable for a range of uses, mainly because of their superior performance characteristics. They are particularly suitable for applications that require large capacitance values, high current and temperature ratings. With proper selection and application, aluminum electrolytic capacitors can provide a reliable and cost-effective solution. Their unique working principle gives them an extremely long life, making them a popular choice among designers and engineers. To fully capitalize on the performance potential of aluminum electrolytic capacitors, it is important to have a good understanding of their application fields and working principle.

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