SLP221M400A9P3

Polarization:	Polar
Package / Case:	Radial, Can - Snap-In
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	2.047" (52.00mm)
Size / Dimension:	0.866" Dia (22.00mm)
Lead Spacing:	0.394" (10.00mm)
Ripple Current @ High Frequency:	1.62A @ 20kHz
Ripple Current @ Low Frequency:	1.1A @ 120Hz
Applications:	General Purpose
Ratings:	--
Series:	SLP
Operating Temperature:	-25°C ~ 105°C
Lifetime @ Temp.:	3000 Hrs @ 105°C
ESR (Equivalent Series Resistance):	1.508 Ohm @ 120Hz
Voltage - Rated:	400V
Tolerance:	±20%
Capacitance:	220µF
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 a common type of capacitor used in electrical and electronic circuits for several reasons. They are rugged, reliable, and offer a large range of capacitance ratings for a given physical size. SLP221M400A9P3 is an example of such aluminum electrolytic capacitors. In this article, we\'re going to look at the application fields and working principles of SLP221M400A9P3.

Application field of SLP221M400A9P3

SLP221M400A9P3 electrolytic capacitors are mainly used to handle high-frequency ripple currents in DC/DC converters and other switching power supplies. As an important part of the switching power supply, the high-frequency ripple current needs to be filtered and absorbed by the capacitor, and the SLP221M400A9P3 electrolytic capacitor is suitable for this application field.In addition to the above application fields, SLP221M400A9P3 electrolytic capacitors can also be used as an input filter for circuits related to amplifiers, power controllers, phase-locked loops, and other filter circuits that need to process AC signals.

Working principle of SLP221M400A9P3

SLP221M400A9P3 electrolytic capacitors are composed of an oxide film (anode), aluminum foil (cathode), electrolyte, and insulation sleeve. When voltage is applied, charge will be stored in the capacitor by two overlapping and oppositely polarized aluminum foils, separated by the oxide layer. The thickness of the oxide layer determines the capacitance of the SLP221M400A9P3. The thickener the oxide layer is, the larger the capacitance of the capacitor will be, and vice versa. The electrolyte provides ions to make up for the charge loss caused by leakage, so that the capacitor can maintain relatively stable capacitance. Since the anode is just the electrolyte, it can be directly soldered and can realize long-term storage and operation. The SLP221M400A9P3 electrolytic capacitor has a large rated capacitance and a small physical volume. The maximum voltage breakdown of the SLP221M400A9P3 is up to 400V, and it has excellent high-temperature resistance up to 105℃. Its excellent voltage breakdown capability, high ripple current ability, and high temperature stability are the primary reasons for its use in high frequency and switch power supply applications.

Conclusion

To sum up, SLP221M400A9P3 electrolytic capacitors are common type of aluminum electrolytic capacitors which has multiple application fields. These capacitors are quite convenient for use due to their large rated capacitance, small volume, and their high temperature resistance. They are frequently used in high-frequency ripple current handling in DC/DC converters and other switching power supplies, as well as in input filters for circuits related to amplifiers and power controllers. The secret to their functionality is the overlapping and oppositely polarized aluminum foils separated by the oxide layer, plus the electrolyte that helps to make up for charge loss in the capacitor.

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