SEK221M035ST

Operating Temperature:	-55°C ~ 105°C
Package / Case:	Radial, Can
Mounting Type:	Through Hole
Surface Mount Land Size:	--
Height - Seated (Max):	0.512" (13.00mm)
Size / Dimension:	0.394" Dia (10.00mm)
Lead Spacing:	0.197" (5.00mm)
Ripple Current @ Low Frequency:	315mA @ 120Hz
Applications:	General Purpose
Ratings:	--
Polarization:	Polar
Series:	SEK
Lifetime @ Temp.:	2000 Hrs @ 105°C
ESR (Equivalent Series Resistance):	840 mOhm
Voltage - Rated:	35V
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

Electrolytic capacitors are a type of capacitor with a wide range of uses. They are used in many electrical and electronic circuits, and are particularly good at storing energy, acting as a filter for high frequencies in audio circuits, and providing very high power ratings for energy storage purposes. SEK221M035ST is a type of aluminum electrolytic capacitor which has a diverse range of applications. The capacitor features a radial configuration and is rated at 35V.

Construction

The SEK221M035ST is constructed with two basic parts: a metal cylinder and two aluminum foils. The casing is made of stamped steel that is crimped and sealed at both ends. The container is filled with a liquid electrolyte and two electrodes, layered with a special insulator, are suspended in the electrolyte. The two electrodes are then connected to the two aluminum foils with an anode (positive terminal) and a cathode (negative terminal).

Working Principle

The aluminum electrolytic capacitor works on the principle of a capacitor being charged with a positive and negative charge. When a direct current is passed through the capacitor, the negative ions move toward the positive terminal and the positive ions move toward the negative terminal. This creates a charge separation between the two terminals inside the capacitor, resulting in energy being stored.

Applications

The SEK221M035ST aluminum electrolytic capacitor is primarily used in power supply and audio applications, as it is able to handle high voltages and current ratings. Some of the applications for the SEK221M035ST include energy buffering in power supplies, filtering of high frequency signals in audio applications, smoothing out of rectified power, powering relays and solenoids, and more.

Advantages

One of the major advantages of aluminum electrolytic capacitors is their high capacitance; they are able to store much more energy than other types of capacitor. They also have a very low equivalent series inductance (ESL), which means they are able to respond very quickly to rapid changes in voltage and current. Additionally, they are reasonably affordable, making them popular with many design engineers.

Disadvantages

One of the major disadvantages of aluminum electrolytic capacitors is their long-term reliability; the electrolyte inside the capacitor can evaporate over time, resulting in a gradual decline in the capacitance. To avoid this, design engineers must take into account the expected life time of the capacitor, and factor in a suitable safety margin. Furthermore, aluminum electrolytic capacitors are relatively large compared to other types, meaning they are not suitable for very small designs.

Conclusion

Aluminum electrolytic capacitors are widely used in many electrical and electronic applications, with the SEK221M035ST being a popular choice for its high power ratings. The SEK221M035ST capacitor offers several advantages, such as its high capacitance, low ESL, and low cost. However, it is important to take into account its limited reliability and large size in order to ensure it is suitable for any given application.

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